2021 Chevrolet Blazer Electrical Connector Parts: OEM & Replacement (152 Parts)

This page lists 152 electrical connector parts for the 2021 Chevrolet Blazer, across 44 part types, covering all 3 engine options (2.0L L4 Turbocharged, 2.5L L4 and 3.6L V6). Every part shows its brand, manufacturer part number and fitment notes.

The connector system on the 2021 Chevrolet Blazer supplies the pigtails and connector bodies that terminate the vehicle harness at lamps, sensors and modules. The largest groups are Engine Wiring Harness / Connector (14 parts), Body Wiring Harness / Connector (13 parts) and Trailer Connector (12 parts). The other 41 part types cover the remaining 113 parts.

A/C Compressor Connector

Brand	Part Number	Markets	Notes	Buy
GM GENUINE Fits: all 2021 Blazer engines	PT3702	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT3702 Black Si Electrical Code: Q46A/C Compressor Solenoid Valve2-Way Femalewith Leads1.5mm	View on Amazon

This table covers the harness connectors at the A/C Compressor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

ABS Wheel Speed Sensor Connector

Brand	Part Number	Markets	Notes	Buy
ACDELCO Fits: all 2021 Blazer engines	PT2160	🇺🇸 US 🇨🇦 CA	GoldShape: Square	View on Amazon
HOLSTEIN Fits: all 2021 Blazer engines	2HAR0035	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Includes ABS Wheel Speed Sensor Wire Harness Fitment notes — HOLSTEIN 2HAR0035 Includes ABS Wheel Speed Sensor Wire Harness Rearwithout Collision Warning System	View on Amazon
STANDARD MOTOR PRODUCTS Fits: all 2021 Blazer engines	HP3945	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	HandypackConnector Shape: Square Fitment notes — STANDARD MOTOR PRODUCTS HP3945 HandypackConnector Shape: SquareIncludes Wheel Speed Sensor Wiring HarnessBlackIncludes ABS Wheel Speed Sensor Wire Harness	View on Amazon
STANDARD MOTOR PRODUCTS Fits: all 2021 Blazer engines	S824	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Connector Shape: SquareHarness Length Fitment notes — STANDARD MOTOR PRODUCTS S824 Connector Shape: SquareHarness LengthIncludes ABS Wheel Speed Sensor Wire HarnessIncludes Wheel Speed Sensor Wiring Harnessinches: 7Length (In): 1.25Wiring Harness Length (mm): 209.55Black	View on Amazon

This table covers the harness connectors at each ABS wheel-speed sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Accelerator Pedal Position Sensor Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: all 2021 Blazer engines	S1478	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Connector Shape: Rectangle	View on Amazon

This table covers the harness connectors at the Accelerator Pedal Position Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Air Intake / Charge Temperature Sensor Connector

Brand	Part Number	Markets	Notes	Buy
GM GENUINE Fits: 2.0L L4 Turbocharged	85518225	🇺🇸 US 🇨🇦 CA	BlackGender: Male Fitment notes — GM GENUINE 85518225 BlackGender: MaleWire Gauge Measurement (GA.): 1.0 MM2 GA. Si Elec Code: B75CMultifunction Intake Air Sensor4-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 2.5L L4, 3.6L V6	84677313	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE 84677313 Black Si Elec Code: B75CMultifunction Intake Air Sensor.75mm28-Way Femalewith Leads	View on Amazon

This table covers the harness connectors at the Air Intake / Charge Temperature Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Alternator / Generator Connector

Brand	Part Number	Markets	Notes	Buy
ACDELCO Fits: all 2021 Blazer engines	84941154	🇺🇸 US 🇨🇦 CA	Black Fitment notes — ACDELCO 84941154 Black Si Elec Code: G13Generator X12-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	PT2971	🇺🇸 US 🇨🇦 CA	Gender: MaleTerminal Type: Blade Fitment notes — GM GENUINE PT2971 Gender: MaleTerminal Type: BladeBlack Si Elec Code: G13Generator X12-Way Femalewith Leads	View on Amazon
STANDARD MOTOR PRODUCTS Fits: all 2021 Blazer engines	S1477	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	without Wiring Harness	View on Amazon
WELLS Fits: all 2021 Blazer engines	1P3341	🇺🇸 US 🇨🇦 CA 🇲🇽 MX		View on Amazon

This table covers the harness connectors at the Alternator / Generator. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Body Control Module (BCM) Connector

Brand	Part Number	Markets	Notes	Buy
GM GENUINE Fits: 2.0L L4 Turbocharged	PT2929	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT2929 Black Fits: LT Model or PremierTrans.Code 9T609 speed Automatic trans.SULEV30 California Emissions (NUG)2-Way Femalewith Leadsor LT Model or PremierTrans.Code 9T609 speed Automatic trans.Tier 3 Federal Emission System (NTB)2-Way Femalewith Leads	View on Amazon

This table covers the harness connectors at the Body Control Module (BCM). Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Body Wiring Harness / Connector

Brand	Part Number	Markets	Notes	Buy
GM GENUINE Popular Fits: all 2021 Blazer engines	87815146	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE 87815146 Black Terminating ResistorHigh Speed Extension Bus 1Si Electrical Code: R6E2-Way Femalewith Leads	View on Amazon
GM GENUINE Popular Fits: all 2021 Blazer engines	PT3702	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT3702 Black Si Elec Code: T10EKeyless Entry AntennaRear Compartment2-Way Femalewith Leads1.5mm	View on Amazon
GM GENUINE Popular Fits: all 2021 Blazer engines	PT3505	🇺🇸 US 🇨🇦 CA	BlackCrimping Tool Included: No Fitment notes — GM GENUINE PT3505 BlackCrimping Tool Included: NoShape: Square SpeakerSubwooferSi Elec Code: P19AC2-Way Femalewith Leads	View on Amazon
GM GENUINE Popular Fits: 2.5L L4, 3.6L V6	PT2612	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT2612 Black Si Elec Code: Q13Evaporative Emission Vent Solenoid Valve2-Way Femalewith Leads	View on Amazon
GM GENUINE Popular Fits: 2.5L L4, 3.6L V6	PT2929	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT2929 Black Si Elec Code: B20Brake Fluid Level Switch2-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	PT2792	🇺🇸 US 🇨🇦 CA	Fits RearLeft Fitment notes — GM GENUINE PT2792 Fits: RearLeftSide Impact SensorSi Elec Code: B63LRDK Gray2-Way Femalewith Leads or: RearRightSide Impact SensorSi Elec Code: B63RRDK Gray2-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	13576549	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE 13576549 Black Si Electric Code: X101Body Harness to Forward Lamp Harness40-Way Femalewithout Leads	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	PT3865	🇺🇸 US 🇨🇦 CA	Si Electrical Code: X80CGray Fitment notes — GM GENUINE PT3865 Si Electrical Code: X80CGrayAccessory Power ReceptacleCargo4.0MM23-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	PT3906	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT3906 Black Fits: FrontLeftWheel Speed SensorSi Elec Code: B5LF2-Way Femalewith Leads or: FrontRightWheel Speed SensorSi Elec Code: B5RF2-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	85761014	🇺🇸 US 🇨🇦 CA	BlackNumber Of Butt Connectors: 2 Fitment notes — GM GENUINE 85761014 BlackNumber Of Butt Connectors: 2 Fits: Si Elec Code: B110Battery Sensor Module X12-Way Femalewith Leadsor Si Elec Code: B20Brake Fluid Level Switch2-Way Femalewith Leadsor Si Elec Code: B34DEngine Coolant Temperature Sensor 42-Way Femalewith Leads Fits: Si Elec Code: B110Battery Sensor Module X12-Way Femalewith Leadsor Si Elec Code: B34DEngine Coolant Temperature Sensor 42-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	PT1101	🇺🇸 US 🇨🇦 CA	Splice PackSi Elec Code: JX300 Fitment notes — GM GENUINE PT1101 Splice PackSi Elec Code: JX300Gray12-Way Femalewith Leads and CapGT150	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	PT3667	🇺🇸 US 🇨🇦 CA	Si Elec Code: K182Parking Assist Control Module X2 Fitment notes — GM GENUINE PT3667 Si Elec Code: K182Parking Assist Control Module X2Gray.75mm8-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	PT2888	🇺🇸 US 🇨🇦 CA	Windshield Wiper MotorSi Elec Code: M75 Fitment notes — GM GENUINE PT2888 Windshield Wiper MotorSi Elec Code: M75Gray5-Way Femalewith Leads	View on Amazon

This table covers the body-harness connectors and pigtails. Typical signs include an intermittent fault that moves when you wiggle the harness, or a melted or corroded plug. Match terminal count and keyway. Repair with heat-shrink terminals, not twist-and-tape.

Brake Pedal Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: all 2021 Blazer engines	S2506	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Terminal Type: Blade Fitment notes — STANDARD MOTOR PRODUCTS S2506 Terminal Type: Blade Pedal Position Sensor Connector	View on Amazon

This table covers the harness connectors at the Brake Pedal. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Camshaft Position Sensor Connector

Brand	Part Number	Markets	Notes	Buy
GM GENUINE Fits: all 2021 Blazer engines	86792094	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE 86792094 Black Fits: Si Elec Code: B23ACamshaft Position SensorBank 1 Exhaust3-Way Femalewith LeadsTerminal PN 1418850-3or Si Elec Code: B23BCamshaft Position SensorBank 1 Intake3-Way Femalewith LeadsTerminal PN 1418850-3or Si Elec Code: B23CCamshaft Position SensorBank 2 Exhaust3-Way Femalewith LeadsTerminal PN 1418850-3or Si Elec Code: B23DCamshaft Position SensorBank 2 Intake3-Way Femalewith LeadsTerminal PN 1418850-3or Si Electrical Code: B23ECamshaft Position SensorExhaust3-Way Femalewith LeadsTerminal PN 1418850-3or Si Electrical Code: B23FCamshaft Position SensorIntake3-Way Femalewith LeadsTerminal PN 1418850-3	View on Amazon
HOLSTEIN Fits: 3.6L V6	2HAR0060	🇺🇸 US 🇨🇦 CA 🇲🇽 MX		View on Amazon
STANDARD MOTOR PRODUCTS Fits: 2.0L L4 Turbocharged	S2807	🇺🇸 US 🇨🇦 CA		View on Amazon
STANDARD MOTOR PRODUCTS Fits: 3.6L V6	S2316	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Connector Shape: OvalNumber of Splice Connectors Included: 3	View on Amazon

This table covers the harness connectors at the Camshaft Position Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Crankshaft Position Sensor Connector

Brand	Part Number	Markets	Notes	Buy
GM GENUINE Fits: 2.0L L4 Turbocharged	PT3921	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT3921 Black Si Elec Code: B26Crankshaft Position Sensor.75mm23-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 2.5L L4, 3.6L V6	86792094	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE 86792094 Black Si Elec Code: B26Crankshaft Position Sensor3-Way Femalewith LeadsTerminal PN 1418850-3	View on Amazon
HOLSTEIN Fits: 2.5L L4, 3.6L V6	2HAR0060	🇺🇸 US 🇨🇦 CA 🇲🇽 MX		View on Amazon
STANDARD MOTOR PRODUCTS Fits: 2.0L L4 Turbocharged	S2916	🇺🇸 US 🇨🇦 CA		View on Amazon
STANDARD MOTOR PRODUCTS Fits: 2.5L L4, 3.6L V6	S2316	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Connector Shape: OvalNumber of Splice Connectors Included: 3	View on Amazon

This table covers the harness connectors at the Crankshaft Position Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Differential Lock Sensor Connector

Brand	Part Number	Markets	Notes	Buy
GM GENUINE Fits: all 2021 Blazer engines	84896487	🇺🇸 US 🇨🇦 CA	AWDLT Model or Premier Fitment notes — GM GENUINE 84896487 AWDLT Model or PremierMating Connector Use 19354741Electronic Twin Clutch Positraction Axle (G99) AWDMating Connector Use 19354741Electronic Twin Clutch Positraction Axle (G99) AWDLT Model or Premier or RS ModelMating Connector Use 19354741Electronic Twin Clutch Positraction Axle (G99)	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	84896488	🇺🇸 US 🇨🇦 CA	AWDLT Model or Premier Fitment notes — GM GENUINE 84896488 AWDLT Model or PremierExcept Electronic Twin Clutch Positraction Axle (G99) AWDExcept Electronic Twin Clutch Positraction Axle (G99)	View on Amazon

This table covers the harness connectors at the Differential Lock Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Engine Block Heater Connector

Brand	Part Number	Markets	Notes	Buy
GM GENUINE Fits: 2.0L L4 Turbocharged	84826708	🇺🇸 US 🇨🇦 CA	Wiring Harness Fitment notes — GM GENUINE 84826708 Wiring Harness Plug Receptacle with DoorExcept Mono Heavy Duty Digital Vision with 360 View (UV2)Engine Block Heater (K05)	View on Amazon
GM GENUINE Fits: 2.0L L4 Turbocharged	84826710	🇺🇸 US 🇨🇦 CA	Wiring Harness Fitment notes — GM GENUINE 84826710 Wiring Harness Plug Receptacle with DoorEngine Block Heater (K05), Mono Heavy Duty Digital Vision with 360 View (UV2)	View on Amazon
GM GENUINE Fits: 2.5L L4, 3.6L V6	84826705	🇺🇸 US 🇨🇦 CA	Wiring Harness Fitment notes — GM GENUINE 84826705 Wiring Harness Plug Receptacle with DoorEngine Block Heater (K05)	View on Amazon

This table covers the harness connectors at the Engine Block Heater. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Engine Wiring Harness / Connector

Brand	Part Number	Markets	Notes	Buy
GM GENUINE Popular Fits: all 2021 Blazer engines	PT2923	🇺🇸 US 🇨🇦 CA	BlackCrimping Tool Included: No Fitment notes — GM GENUINE PT2923 BlackCrimping Tool Included: NoLength: 12 in Si Elec Code: X182Engine Harness To Engine Oil Solenoid Extension Harness4-Way Femalewith Leads Crimping Tool Included: NoLength: 12 inBlack	View on Amazon
GM GENUINE Popular Fits: all 2021 Blazer engines	PT2971	🇺🇸 US 🇨🇦 CA	Gender: MaleTerminal Type: Blade Fitment notes — GM GENUINE PT2971 Gender: MaleTerminal Type: BladeBlack Starter Motor X1Si Elec Code: M642-Way Femalewith Leads Fits: Si Elec Code: B35Engine Oil Level Switch2-Way Femalewith Leadsor Starter Motor X1Si Elec Code: M642-Way Femalewith Leads	View on Amazon
GM GENUINE Popular Fits: all 2021 Blazer engines	PT2929	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT2929 Black Fits: Si Elec Code: B203Radiator Coolant Temperature Sensor2-Way Femalewith Leadsor Si Elec Code: X111Engine Harness To Engine Oil Solenoid Extension Harness2-Way Femalewith Leadsor Service Information Electrical Code: Q12Evaporative Emission Purge Solenoid Valve2-Way Femalewith Leads Fits: Si Elec Code: B203Radiator Coolant Temperature Sensor2-Way Femalewith Leadsor Si Elec Code: X111Engine Harness To Engine Oil Solenoid Extension Harness2-Way Femalewith Leads	View on Amazon
GM GENUINE Popular Fits: 3.6L V6	PT3612	🇺🇸 US 🇨🇦 CA	BlackTerminal Gender: Female Fitment notes — GM GENUINE PT3612 BlackTerminal Gender: FemaleWidth: 6 in Si Elec Code: X160Engine Harness To Fuel RailOdd Harness6-Way Femalewith Leads	View on Amazon
ACDELCO Fits: all 2021 Blazer engines	PT3743	🇺🇸 US 🇨🇦 CA	GM Original Equipment Fitment notes — ACDELCO PT3743 GM Original Equipment TURBOCHARGER BYPASS SOLENOID VALVESI Electric Code: Q40BLACK2-WAY FEMALEwith Leads	View on Amazon
ACDELCO Fits: all 2021 Blazer engines	84941154	🇺🇸 US 🇨🇦 CA	Black Fitment notes — ACDELCO 84941154 Black Starter Motor X1Si Elec Code: M642-Way Femalewith Leads Fits: Si Elec Code: B35Engine Oil Level Switch2-Way Femalewith Leadsor Starter Motor X1Si Elec Code: M642-Way Femalewith Leads	View on Amazon
ACDELCO Fits: all 2021 Blazer engines	84785110	🇺🇸 US 🇨🇦 CA	GM Original Equipment Fitment notes — ACDELCO 84785110 GM Original Equipment Fits: Si Electric Code: Q6ECamshaft Position Actuator Solenoid Valve - ExhaustBlack.75mm2-Way Femalewith Leadsor Si Electric Code: Q6FCamshaft Position Actuator Solenoid Valve - IntakeBlack.75mm2-Way Femalewith Leadsor BLACKAUTOMATIC TRANSMISSION ACCUMULATOR SOLENOID VALVE.75MM22-WAY FEMALEwith Leads	View on Amazon
ACDELCO Fits: all 2021 Blazer engines	PT3698	🇺🇸 US 🇨🇦 CA	GM Original Equipment Fitment notes — ACDELCO PT3698 GM Original Equipment Si Electric Code: G58Evaporative Emission Purge PumpBlack.75mm6-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	PT3702	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT3702 Black Fits: Si Elec Code: Q6ACamshaft Position Actuator Solenoid ValveBank 1 Exhaust2-Way Femalewith Leads1.5mmor Si Elec Code: Q6BCamshaft Position Actuator Solenoid ValveBank 1 Intake2-Way Femalewith Leads1.5mmor Si Elec Code: Q6CCamshaft Position Actuator Solenoid ValveBank 2 Exhaust2-Way Femalewith Leads1.5mmor Si Elec Code: Q6DCamshaft Position Actuator Solenoid ValveBank 2 Intake2-Way Femalewith Leads1.5mmor Si Electrical Code: Q84ACamshaft Position Actuator Park Lock Solenoid ValveBank 1 Intake2-Way Femalewith Leads1.5mmor Si Electrical Code: Q84BCamshaft Position Actuator Park Lock Solenoid ValveBank 2 Intake2-Way Femalewith Leads1.5mmor Valve Lifter Oil Solenoid ValveBank 1Si Electrical Code: Q83A2-Way Femalewith Leads1.5mmor Valve Lifter Oil Solenoid ValveBank 2Si Electrical Code: Q83B2-Way Femalewith Leads1.5mm	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	13577534	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE 13577534 Black Fits: Si Elec Code: G18High Pressure Fuel Pump2-Way Femalewith Leadsor Si Elec Code: Q44Engine Oil Pressure Control Solenoid Valve2-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	PT2931	🇺🇸 US 🇨🇦 CA	Si Elec Code: Q6FGray Fitment notes — GM GENUINE PT2931 Si Elec Code: Q6FGrayCamshaft Position Actuator Solenoid ValveIntake2-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	85761014	🇺🇸 US 🇨🇦 CA	BlackNumber Of Butt Connectors: 2 Fitment notes — GM GENUINE 85761014 BlackNumber Of Butt Connectors: 2 Si Elec Code: Q2A/C Compressor Clutch2-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	PT3534	🇺🇸 US 🇨🇦 CA	BlackShape: Oval Fitment notes — GM GENUINE PT3534 BlackShape: Oval Fits: Throttle BodySi Elec Code: Q386-Way Femalewith Leadsor Turbocharger Wastegate ActuatorSi Elec Code: M1286-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	19352907	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE 19352907 Black Si Electrical Code: X161Engine Harness to Fuel RailEven Harness12-Way Femalewithout Leads	View on Amazon

This table covers the wiring-harness connectors at the Engine. Typical signs include an intermittent fault that moves when you wiggle the harness, or a melted or corroded plug. Match terminal count and keyway. Repair with heat-shrink terminals, not twist-and-tape.

Fuel Injection Pressure Sensor Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: 2.5L L4	S2882	🇺🇸 US	Connector Shape: RectangularHarness Length Fitment notes — STANDARD MOTOR PRODUCTS S2882 Connector Shape: RectangularHarness Lengthinches: 12.25	View on Amazon

This table covers the harness connectors at the Fuel Injection Pressure Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Fuel Injector Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Popular Fits: 2.5L L4, 3.6L V6	HP4347	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Handypack	View on Amazon
GB REMANUFACTURING Fits: 2.5L L4, 3.6L V6	5191	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	LT Model or Premier or RS Model or True North	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	19352907	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE 19352907 Black SI ELEC CODE: X160ENGINE HARNESS TO FUEL INJECTOR RAIL HARNESS12-WAY FEMALEwithout LEADS	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	13584788	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE 13584788 Black SI ELEC CODE: X160ENGINE HARNESS TO FUEL INJECTOR RAIL HARNESS16-WAY FEMALEwithout LEADS	View on Amazon
STANDARD MOTOR PRODUCTS Fits: 2.5L L4, 3.6L V6	S1895	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Number of Splice Connectors Included: 2	View on Amazon

This table covers the harness connectors at the Fuel Injector. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Fuel Sending Unit Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: all 2021 Blazer engines	S3309	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	FWD	View on Amazon

This table covers the harness connectors at the Fuel Sending Unit. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Fuel Tank Pressure Sensor Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: all 2021 Blazer engines	S1445	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Wiring Harness Length (In): 17Wiring Harness Length (mm): 431.8	View on Amazon

This table covers the harness connectors at the Fuel Tank Pressure Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Headlamp Wiring Harness / Connector

Brand	Part Number	Markets	Notes	Buy
ACDELCO Popular Fits: all 2021 Blazer engines	PT3940	🇺🇸 US 🇨🇦 CA	GM Original Equipment Fitment notes — ACDELCO PT3940 GM Original Equipment Turbocharger Boost SensorBlack3-Way Femalewith Leads1.0MM2	View on Amazon
GM GENUINE Popular Fits: all 2021 Blazer engines	85519071	🇺🇸 US 🇨🇦 CA	Black or Color: Natural Fitment notes — GM GENUINE 85519071 Black or Color: Natural Si Elec Code: M96AActive Grille Air Shutter 1 Actuator4-Way Femalewith Leads	View on Amazon
GM GENUINE Popular Fits: all 2021 Blazer engines	PT3612	🇺🇸 US 🇨🇦 CA	Terminal Gender: FemaleWidth: 6 in Fitment notes — GM GENUINE PT3612 Terminal Gender: FemaleWidth: 6 inBlack Fits: LeftSi Elec Code: X110Forward Lamp Harness to Headlamp Harness6-Way Femalewith Leads or: RightSi Elec Code: X120Forward Lamp Harness to Headlamp Harness6-Way Femalewith Leads BlackTerminal Gender: FemaleWidth: 6 in	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	PT2792	🇺🇸 US 🇨🇦 CA	Fits LeftSi Elec Code: B59L Fitment notes — GM GENUINE PT2792 Fits: LeftSi Elec Code: B59LFront Impact SensorDK Gray2-Way Femalewith Leads or: RightSi Elec Code: B59RFront Impact SensorDK Gray2-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	85005016	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE 85005016 Black Windshield Washer PumpSi Elec Code: G242-Way Femalewith Leads2.5MM2	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	PT3776	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT3776 Black Si Elec Code: B55Engine Hood Switch3-Way Femalewith Leads0.75MM2	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	PT3505	🇺🇸 US 🇨🇦 CA	BlackCrimping Tool Included: No Fitment notes — GM GENUINE PT3505 BlackCrimping Tool Included: NoShape: Square Si Elec Code: P13Horn Assembly2-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	13593220	🇺🇸 US 🇨🇦 CA	Windshield Washer Fluid Level SwitchSi Elec Code: B118B Fitment notes — GM GENUINE 13593220 Windshield Washer Fluid Level SwitchSi Elec Code: B118BGray2-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	84677312	🇺🇸 US 🇨🇦 CA	Fits LeftSI Electrical Code (E4AC) Fitment notes — GM GENUINE 84677312 Fits: LeftSI Electrical Code (E4AC)Park/Daytime Running LampGray3-Way Femalewith LeadsMX150 SER1.5MM2 or: RightSi Elec Code: E4ADPark/Daytime Running LampGray3-Way Femalewith LeadsMX150 SER1.5MM2	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	84928314	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE 84928314 Black Si Elec Code: X102Forward Lamp Harness to Front Fascia Harness8-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	PT3473	🇺🇸 US 🇨🇦 CA	Fits LeftSi Elec Code: X110 Fitment notes — GM GENUINE PT3473 Fits: LeftSi Elec Code: X110NaturalForward Lamp Harness to Headlamp Harness6-Way Femalewith Leads or: RightSi Elec Code: X120NaturalForward Lamp Harness to Headlamp Harness6-Way Femalewith Leads	View on Amazon

This table covers the wiring-harness connectors at the Headlamp. Typical signs include an intermittent fault that moves when you wiggle the harness, or a melted or corroded plug. Match terminal count and keyway. Repair with heat-shrink terminals, not twist-and-tape.

Headliner Connector

Brand	Part Number	Markets	Notes	Buy
ACDELCO Popular Fits: all 2021 Blazer engines	PT3868	🇺🇸 US 🇨🇦 CA	GM Original Equipment Fitment notes — ACDELCO PT3868 GM Original Equipment HEADLINER HARNESS TO GARAGE DOOR OPENER JUMPER HARNESSBLACK.75MM24-WAY FEMALEwith Leads	View on Amazon
GM GENUINE Popular Fits: all 2021 Blazer engines	PT2726	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT2726 Black Fits: LeftSunshadeSi Elec Code: A3L2-Way Malewith LeadsSquare or: RightSunshadeSi Elec Code: A3R2-Way Malewith LeadsSquare or: FrontLeftService Information Electric Code: B24LFMobile Telephone Microphone2-Way Malewith LeadsSquare	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	12126020	🇺🇸 US 🇨🇦 CA	FrontRight Fitment notes — GM GENUINE 12126020 FrontRightService Information Electric Code: B24RFMobile Telephone MicrophoneGreen2-Way Malewith Leads	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	13507121	🇺🇸 US 🇨🇦 CA	BlackTerminal Gender: Male Female Fitment notes — GM GENUINE 13507121 BlackTerminal Gender: Male Female Si Electrical Code: B174WFrontview CameraWindshield12-Way Femalewithout Leads	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	13577390	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE 13577390 Black Si Electrical Code: A10Inside Rear View Mirror X110-Way Femalewithout LeadsTerminated Leads 13575867	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	84766302	🇺🇸 US 🇨🇦 CA	Fits LeftSi Elec Code: E37H Fitment notes — GM GENUINE 84766302 Fits: LeftSi Elec Code: E37HGrayDome/Reading LampsRoof Rail.75mm24-Way Femalewith Leads or: RightSi Elec Code: E37JGrayDome/Reading LampsRoof Rail.75mm24-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	PT2991	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT2991 Black Windshield Temperature and Inside Moisture SensorSi Elec Code: B1606-Way Malewith Leads	View on Amazon

This table covers the harness connectors at the Headliner. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

HVAC Control Switch / Panel Connector

Brand	Part Number	Markets	Notes	Buy
GPD Fits: all 2021 Blazer engines	1713412	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	with 3 Terminal(s)	View on Amazon

This table covers the harness connectors at the HVAC Control Switch / Panel. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Hybrid Battery Voltage Sensor Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: all 2021 Blazer engines	S2860	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Connector Shape: OvalGauge: 16 Gauge Fitment notes — STANDARD MOTOR PRODUCTS S2860 Connector Shape: OvalGauge: 16 GaugeHarness LengthInches: 13Terminal Type: Bladeblack	View on Amazon

This table covers the harness connectors at the Hybrid Battery Voltage Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Ignition Coil Connector

Brand	Part Number	Markets	Notes	Buy
GM GENUINE Fits: 2.0L L4 Turbocharged	PT2923	🇺🇸 US 🇨🇦 CA	BlackCrimping Tool Included: No Fitment notes — GM GENUINE PT2923 BlackCrimping Tool Included: NoLength: 12 in Fits: Si Elec Code: T8DIgnition Coil 44-Way Femalewith Leadsor Si Elec Code: T8AIgnition Coil 14-Way Femalewith Leadsor Si Elec Code: T8BIgnition Coil 24-Way Femalewith Leadsor Si Elec Code: T8CIgnition Coil 34-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 2.5L L4	PT3891	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT3891 Black Fits: Si Elec Code: T8AIgnition Coil 14-Way Femalewith Leads1.5MM2 or: Si Elec Code: T8BIgnition Coil 24-Way Femalewith Leads1.5MM2 or: Si Elec Code: T8CIgnition Coil 34-Way Femalewith Leads1.5MM2 or: Si Elec Code: T8DIgnition Coil 44-Way Femalewith Leads1.5MM2	View on Amazon
GM GENUINE Fits: 3.6L V6	85518225	🇺🇸 US 🇨🇦 CA	BlackGender: Male Fitment notes — GM GENUINE 85518225 BlackGender: MaleWire Gauge Measurement (GA.): 1.0 MM2 GA. Fits: Si Elec Code: T8DIgnition Coil 44-Way Femalewith Leadsor Si Elec Code: T8AIgnition Coil 14-Way Femalewith Leadsor Si Elec Code: T8BIgnition Coil 24-Way Femalewith Leadsor Si Elec Code: T8CIgnition Coil 34-Way Femalewith Leadsor Si Elec Code: T8EIgnition Coil 54-Way Femalewith Leadsor Si Elec Code: T8FIgnition Coil 64-Way Femalewith Leads	View on Amazon
STANDARD MOTOR PRODUCTS Fits: 2.0L L4 Turbocharged, 3.6L V6	S2894	🇺🇸 US 🇨🇦 CA 🇲🇽 MX		View on Amazon
STANDARD MOTOR PRODUCTS Fits: 2.5L L4	S2927	🇺🇸 US		View on Amazon

This table covers the harness connectors at the Ignition Coil. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Instrument Panel Connector

Brand	Part Number	Markets	Notes	Buy
GM GENUINE Popular Fits: all 2021 Blazer engines	87815146	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE 87815146 Black Terminating ResistorHigh Speed Extension Bus 2Si Electrical Code: R6F2-Way Femalewith Leads	View on Amazon
GM GENUINE Popular Fits: all 2021 Blazer engines	PT2195	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT2195 Black Steering Column Tilt and Telescope SwitchSi Elec Code: S717-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	85761014	🇺🇸 US 🇨🇦 CA	BlackNumber Of Butt Connectors: 2 Fitment notes — GM GENUINE 85761014 BlackNumber Of Butt Connectors: 2 Si Elec Code: T10UKeyless Entry AntennaInstrument Panel2-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	84773558	🇺🇸 US 🇨🇦 CA	Si Elec Code: B107Natural with Black Cover Fitment notes — GM GENUINE 84773558 Si Elec Code: B107Natural with Black CoverAccelerator Pedal Position Sensor6-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	PT3695	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT3695 Black Si Elec Code: M8Blower Motor6-Way Femalewith Leads5MM2/.75MM2	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	84683650	🇺🇸 US 🇨🇦 CA	Si Elec Code: B22Natural Fitment notes — GM GENUINE 84683650 Si Elec Code: B22NaturalBrake Pedal Position Sensor6-Way Femalewith Leads	View on Amazon

This table covers the harness connectors at the Instrument Panel. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Knock / Detonation Sensor Connector

Brand	Part Number	Markets	Notes	Buy
GM GENUINE Fits: all 2021 Blazer engines	19301207	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE 19301207 Black Si Elec Code: B68AKnock Sensor 12-Way Femalewith Leads Fits: Si Elec Code: B68BKnock Sensor 22-Way Femalewith Leadsor Si Elec Code: B68AKnock Sensor 12-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 2.0L L4 Turbocharged	13577534	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE 13577534 Black Si Elec Code: B68BKnock Sensor 22-Way Femalewith Leads	View on Amazon
STANDARD MOTOR PRODUCTS Fits: 2.0L L4 Turbocharged	S2860	🇺🇸 US 🇨🇦 CA	Connector Shape: OvalGauge: 16 Gauge Fitment notes — STANDARD MOTOR PRODUCTS S2860 Connector Shape: OvalGauge: 16 GaugeHarness LengthInches: 13Terminal Type: Bladeblack without Harness	View on Amazon
STANDARD MOTOR PRODUCTS Fits: 2.5L L4, 3.6L V6	S934	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Contact Terminal Material: Metal	View on Amazon
WELLS Fits: 3.6L V6	1P1571	🇺🇸 US 🇨🇦 CA 🇲🇽 MX		View on Amazon

This table covers the harness connectors at the Knock / Detonation Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Manifold Pressure (MAP) Sensor Connector

Brand	Part Number	Markets	Notes	Buy
BWD/NIEHOFF Fits: all 2021 Blazer engines	PT944	🇺🇸 US 🇨🇦 CA	Evaporator Emission Control ConnectorAt Fuel Tank Pressure Sensor	View on Amazon
STANDARD MOTOR PRODUCTS Fits: 2.5L L4	S1038	🇺🇸 US	Connector Shape: Rectangle	View on Amazon
WELLS Fits: 2.5L L4	1P2218	🇺🇸 US		View on Amazon

This table covers the harness connectors at the Manifold Pressure (MAP) Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Mass Air Flow (MAF) Sensor Connector

Brand	Part Number	Markets	Notes	Buy
GM GENUINE Fits: 2.5L L4	PT3043	🇺🇸 US 🇨🇦 CA	Si Elec Code: B74Manifold Absolute Pressure Sensor Fitment notes — GM GENUINE PT3043 Si Elec Code: B74Manifold Absolute Pressure SensorBlack with Blue Lock3-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 3.6L V6	86792094	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE 86792094 Black Si Elec Code: B74Manifold Absolute Pressure Sensor3-Way Femalewith LeadsTerminal PN 1418850-3	View on Amazon
STANDARD MOTOR PRODUCTS Fits: 2.5L L4, 3.6L V6	S2507	🇺🇸 US 🇨🇦 CA 🇲🇽 MX		View on Amazon

This table covers the harness connectors at the Mass Air Flow (MAF) Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Oil Pressure Sender / Switch Connector

Brand	Part Number	Markets	Notes	Buy
GM GENUINE Fits: 2.0L L4 Turbocharged, 3.6L V6	PT2980	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT2980 Black Si Elec Code: B37BEngine Oil Pressure Sensor3-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 2.5L L4	86792094	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE 86792094 Black Si Elec Code: B37BEngine Oil Pressure Sensor3-Way Femalewith LeadsTerminal PN 1418850-3	View on Amazon
STANDARD MOTOR PRODUCTS Fits: all 2021 Blazer engines	S2882	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Connector Shape: RectangularHarness Length Fitment notes — STANDARD MOTOR PRODUCTS S2882 Connector Shape: RectangularHarness Lengthinches: 12.25	View on Amazon

This table covers the harness connectors at the Oil Pressure Sender / Switch. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Oil Pump Control Valve / Solenoid Connector

Brand	Part Number	Markets	Notes	Buy
GM GENUINE Fits: 3.6L V6	12690487	🇺🇸 US 🇨🇦 CA	LT Model or Premier or RS ModelMating Connector Use 13587326 Fitment notes — GM GENUINE 12690487 LT Model or Premier or RS ModelMating Connector Use 135873262-Way with LeadsJumper Wire	View on Amazon

This table covers the harness connectors at the Oil Pump Control Valve / Solenoid. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Oil Temperature Sender Connector

Brand	Part Number	Markets	Notes	Buy
GM GENUINE Fits: all 2021 Blazer engines	PT3921	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT3921 Black Si Elec Code: B36Engine Oil Temperature Sensor.75mm23-Way Femalewith Leads	View on Amazon

This table covers the harness connectors at the Oil Temperature Sender. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Oxygen (O2) Sensor Connector

Brand	Part Number	Markets	Notes	Buy
GM GENUINE Fits: 2.5L L4	PT2923	🇺🇸 US 🇨🇦 CA	BlackCrimping Tool Included: No Fitment notes — GM GENUINE PT2923 BlackCrimping Tool Included: NoLength: 12 in Si Elec Code: B52AHeated Oxygen Sensor 14-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 2.5L L4	PT2922	🇺🇸 US 🇨🇦 CA	Si Elec Code: B52BHeated Oxygen Sensor 2 Fitment notes — GM GENUINE PT2922 Si Elec Code: B52BHeated Oxygen Sensor 2Gray4-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 3.6L V6	PT3353	🇺🇸 US 🇨🇦 CA	Fits Si Elec Code: B52FHeated Oxygen Sensor Fitment notes — GM GENUINE PT3353 Fits: Si Elec Code: B52FHeated Oxygen SensorBank 2 Sensor 2Gray4-Way Femalewith Leadsor Si Elec Code: B52DHeated Oxygen SensorBank 1 Sensor 2Gray4-Way Femalewith Leadsor Si Elec Code: B52CHeated Oxygen SensorBank 1 Sensor 1Gray4-Way Femalewith Leadsor Si Elec Code: B52EHeated Oxygen SensorBank 2 Sensor 1Gray4-Way Femalewith Leads	View on Amazon
STANDARD MOTOR PRODUCTS Fits: 2.5L L4	S3097	🇺🇸 US	RearGray Fitment notes — STANDARD MOTOR PRODUCTS S3097 RearGraywith 4 Female Terminals	View on Amazon

This table covers the harness connectors at the Oxygen (O2) Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Parking Brake Actuator Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: all 2021 Blazer engines	S1414	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Connector Shape: RectangleTerminal Type: Blade Fitment notes — STANDARD MOTOR PRODUCTS S1414 Connector Shape: RectangleTerminal Type: BladeWiring Harness Length (mm): 476.25Rear	View on Amazon

This table covers the harness connectors at the Parking Brake Actuator. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Radiator Fan Motor Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: all 2021 Blazer engines	S2267	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Connector Shape: Round	View on Amazon

This table covers the harness connectors at the Radiator Fan Motor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Speed Sensor Connector

Brand	Part Number	Markets	Notes	Buy
DORMAN Fits: 3.6L V6	645160	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Black Fitment notes — DORMAN 645160 Black 2 Way Female	View on Amazon

This table covers the harness connectors at the Speed Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Steering Column Wiring Harness

Brand	Part Number	Markets	Notes	Buy
GM GENUINE Fits: 2.0L L4 Turbocharged, 3.6L V6	23188723	🇺🇸 US 🇨🇦 CA	PremierPower Retractable Tilt Steering Column (N38) Fitment notes — GM GENUINE 23188723 PremierPower Retractable Tilt Steering Column (N38)Exc. ELECTRIC Steering Column Lock Control (N06) Premier or RS ModelPower Retractable Tilt Steering Column (N38)Exc. ELECTRIC Steering Column Lock Control (N06)	View on Amazon

This table covers the Steering Column Wiring harnesses.

Temperature Sender / Sensor Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Popular Fits: 2.5L L4	S1686	🇺🇸 US	Connector Shape: OvalBlack Fitment notes — STANDARD MOTOR PRODUCTS S1686 Connector Shape: OvalBlackIncludes Wheel Speed Sensor Wiring Harness, ABS Wheel Speed Sensor Wire Harness	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	PT2550	🇺🇸 US 🇨🇦 CA	BlackShape: Round Fitment notes — GM GENUINE PT2550 BlackShape: Round Si Elec Code: B34Engine Coolant Temperature Sensor2-Way Femalewith LeadsPhysically verify part matches original plug	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	85761014	🇺🇸 US 🇨🇦 CA	BlackNumber Of Butt Connectors: 2 Fitment notes — GM GENUINE 85761014 BlackNumber Of Butt Connectors: 2 Fits: Si Elec Code: B34AEngine Coolant Temperature Sensor 12-Way Femalewith Leadsor Si Elec Code: B34BEngine Coolant Temperature Sensor 22-Way Femalewith Leadsor Si Elec Code: B34CEngine Coolant Temperature Sensor 32-Way Femalewith Leads	View on Amazon
HOLSTEIN Fits: 2.5L L4	2HAR0036	🇺🇸 US	Includes ABS Wheel Speed Sensor Wire Harness	View on Amazon
STANDARD MOTOR PRODUCTS Fits: 3.6L V6	S2860	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Connector Shape: OvalGauge: 16 Gauge Fitment notes — STANDARD MOTOR PRODUCTS S2860 Connector Shape: OvalGauge: 16 GaugeHarness LengthInches: 13Terminal Type: Bladeblack	View on Amazon
WELLS Fits: 2.5L L4	1P3395	🇺🇸 US		View on Amazon

This table covers the harness connectors at the Temperature Sender / Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Throttle Control Actuator Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: all 2021 Blazer engines	S2409	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Gender: MaleHarness Length Fitment notes — STANDARD MOTOR PRODUCTS S2409 Gender: MaleHarness Lengthinches: 12.5	View on Amazon

This table covers the harness connectors at the Throttle Control Actuator. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Trailer Adapter Connector

Brand	Part Number	Markets	Notes	Buy
CURT Fits: all 2021 Blazer engines	57101	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	7-Way Round RV To 4-Way Flat Adapter Fitment notes — CURT 57101 7-Way Round RV To 4-Way Flat Adapter Fits: AWDLT Model or Premierwith Back Up AlarmGM/Ford Plugwith Factory Tow Packag or: Premier or True Northwith Back Up AlarmGM/Ford Plugwith Factory Tow Package AWDwith Back Up AlarmGM/Ford Plugwith Factory Tow Package Fits: AWDLT Model or Premier or RS Modelwith Back Up AlarmGM/Ford Plugwith Factory Tow Packag or: Premier or RS Model or True Northwith Back Up AlarmGM/Ford Plugwith Factory Tow Package	View on Amazon

This table covers the harness connectors at the Trailer Adapter. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Trailer Connector

Brand	Part Number	Markets	Notes	Buy
CURT Popular Fits: all 2021 Blazer engines	56415	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Replacement 7-Way RV Blade OEM SocketTwist-In Fitment notes — CURT 56415 Replacement 7-Way RV Blade OEM SocketTwist-In Fits: AWDLT Model or Premierwith Factory Tow Packag or: Premier or True Northwith Factory Tow Package AWDwith Factory Tow Package Fits: AWDLT Model or Premier or RS Modelwith Factory Tow Packag or: Premier or RS Model or True Northwith Factory Tow Package	View on Amazon
CURT Popular Fits: all 2021 Blazer engines	55415	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Replacement 7-Way RV Blade OEM Socket Fitment notes — CURT 55415 Replacement 7-Way RV Blade OEM Socket Fits: AWDLT Model or Premierwith Factory Tow Packag or: Premier or True Northwith Factory Tow Package AWDwith Factory Tow Package Fits: AWDLT Model or Premier or RS Modelwith Factory Tow Packag or: Premier or RS Model or True Northwith Factory Tow Package	View on Amazon
CURT Popular Fits: all 2021 Blazer engines	56229	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	7-Way USCAR Electrical ConnectorLength: 24 in. Fitment notes — CURT 56229 7-Way USCAR Electrical ConnectorLength: 24 in.Bonded Wire Fits: AWDLT Model or Premierwith Factory Tow Packag or: Premier or True Northwith Factory Tow Package AWDwith Factory Tow Package Fits: AWDLT Model or Premier or RS Modelwith Factory Tow Packag or: Premier or RS Model or True Northwith Factory Tow Package	View on Amazon
CURT Fits: all 2021 Blazer engines	55515	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Custom Wiring ConnectorOE 4-Way Flat Fitment notes — CURT 55515 Custom Wiring ConnectorOE 4-Way FlatPlugs Into USCAR Fits: AWDLT Model or PremierReplacement2-Wire Systemwith Factory Tow Packag or: Premier or True NorthReplacement2-Wire Systemwith Factory Tow Package AWDReplacement2-Wire Systemwith Factory Tow Package Fits: AWDLT Model or Premier or RS ModelReplacement2-Wire Systemwith Factory Tow Packag or: Premier or RS Model or True NorthReplacement2-Wire Systemwith Factory Tow Package	View on Amazon
CURT Fits: all 2021 Blazer engines	56515	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Custom Wiring Connector5-Way Flat Fitment notes — CURT 56515 Custom Wiring Connector5-Way Flat Fits: AWDLT Model or Premier2-Wire Systemwith Factory Tow Packag or: Premier or True North2-Wire Systemwith Factory Tow Package AWD2-Wire Systemwith Factory Tow Package Fits: AWDLT Model or Premier or RS Model2-Wire Systemwith Factory Tow Packag or: Premier or RS Model or True North2-Wire Systemwith Factory Tow Package	View on Amazon
CURT Fits: all 2021 Blazer engines	56325	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Custom Wiring Connector4-Way Flat Fitment notes — CURT 56325 Custom Wiring Connector4-Way Flat Fits: AWDLT Model or Premieror Premier or True North Fits: AWD or: L Model Fits: AWDLT Model or Premier or RS Modelor Premier or RS Model or True North	View on Amazon
CURT Fits: all 2021 Blazer engines	55774	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	OEM Vehicle to Trailer Connector with Harness7-Way and 4-Way Fitment notes — CURT 55774 OEM Vehicle to Trailer Connector with Harness7-Way and 4-Way Fits: AWDLT Model or Premierwith Factory Tow Packag or: Premier or True Northwith Factory Tow Package AWDwith Factory Tow Package Fits: AWDLT Model or Premier or RS Modelwith Factory Tow Packag or: Premier or RS Model or True Northwith Factory Tow Package	View on Amazon
CURT Fits: all 2021 Blazer engines	57015	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	OEM Replacement Dual-Output 7 and 4 Way ConnectorPlugs Into USCAR Socket Fitment notes — CURT 57015 OEM Replacement Dual-Output 7 and 4 Way ConnectorPlugs Into USCAR Socket Fits: AWDLT Model or Premieror Premier or True North AWD Fits: AWDLT Model or Premier or RS Modelor Premier or RS Model or True North	View on Amazon
CURT Fits: all 2021 Blazer engines	55384	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Custom Wiring Connector4-Way Flat Fitment notes — CURT 55384 Custom Wiring Connector4-Way FlatRetains Use of 7 Way Round Connector Fits: AWDLT Model or Premier2-Wire Systemwith Factory Tow Packag or: Premier or True North2-Wire Systemwith Factory Tow Package AWD2-Wire Systemwith Factory Tow Package Fits: AWDLT Model or Premier or RS Model2-Wire Systemwith Factory Tow Packag or: Premier or RS Model or True North2-Wire Systemwith Factory Tow Package	View on Amazon
CURT Fits: all 2021 Blazer engines	57020	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	OEM Replacement Dual-Output 7 and 4 Way ConnectorPackaged Fitment notes — CURT 57020 OEM Replacement Dual-Output 7 and 4 Way ConnectorPackaged Fits: AWDLT Model or PremierFactory TowPlugs Into USCAR or: Premier or True NorthFactory TowPlugs Into USCAR AWDFactory TowPlugs Into USCAR Fits: AWDLT Model or Premier or RS ModelFactory TowPlugs Into USCAR or: Premier or RS Model or True NorthFactory TowPlugs Into USCAR	View on Amazon
CURT Fits: all 2021 Blazer engines	56584	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Custom Wiring Harness5-Way Flat Fitment notes — CURT 56584 Custom Wiring Harness5-Way FlatRetains Use Of 7-Way OEM Fits: AWDLT Model or Premier2-Wire Systemwith Factory Tow Packag or: Premier or True North2-Wire Systemwith Factory Tow Package AWD2-Wire Systemwith Factory Tow Package Fits: AWDLT Model or Premier or RS Model2-Wire Systemwith Factory Tow Packag or: Premier or RS Model or True North2-Wire Systemwith Factory Tow Package	View on Amazon
CURT Fits: all 2021 Blazer engines	56326	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Custom Wiring Connector7-Way Round RV Blade Fitment notes — CURT 56326 Custom Wiring Connector7-Way Round RV Blade Fits: AWDLT Model or Premieror Premier or True North AWD Fits: AWDLT Model or Premier or RS Modelor Premier or RS Model or True North	View on Amazon

This table covers the trailer-lighting connectors at the hitch. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Trailer Extension Connector

Brand	Part Number	Markets	Notes	Buy
CURT Fits: all 2021 Blazer engines	56475	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Custom Wiring Harness Extension Fitment notes — CURT 56475 Custom Wiring Harness Extension 20"Uscar To Uscarwith Factory Tow Package LT Model or Premier or RS Model or True North20"Uscar To Uscarwith Factory Tow Package	View on Amazon

This table covers the harness connectors at the Trailer Extension. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Vapor Canister Purge Valve / Solenoid Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: 2.5L L4	S2860	🇺🇸 US	Connector Shape: OvalGauge: 16 Gauge Fitment notes — STANDARD MOTOR PRODUCTS S2860 Connector Shape: OvalGauge: 16 GaugeHarness LengthInches: 13Terminal Type: Bladeblack	View on Amazon

This table covers the harness connectors at the Vapor Canister Purge Valve / Solenoid. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Vapor Canister Vent Valve / Solenoid Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Popular Fits: all 2021 Blazer engines	HP3945	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	HandypackConnector Shape: Square Fitment notes — STANDARD MOTOR PRODUCTS HP3945 HandypackConnector Shape: SquareIncludes Wheel Speed Sensor Wiring HarnessBlackIncludes ABS Wheel Speed Sensor Wire Harness	View on Amazon
ACDELCO Fits: all 2021 Blazer engines	PT2160	🇺🇸 US 🇨🇦 CA	GoldShape: Square	View on Amazon
GM GENUINE Fits: 2.0L L4 Turbocharged	84710212	🇺🇸 US 🇨🇦 CA	LT Model or Premier	View on Amazon
HOLSTEIN Fits: all 2021 Blazer engines	2HAR0035	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Includes ABS Wheel Speed Sensor Wire Harness	View on Amazon
STANDARD MOTOR PRODUCTS Fits: all 2021 Blazer engines	S824	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Connector Shape: SquareHarness Length Fitment notes — STANDARD MOTOR PRODUCTS S824 Connector Shape: SquareHarness LengthIncludes ABS Wheel Speed Sensor Wire HarnessIncludes Wheel Speed Sensor Wiring Harnessinches: 7Length (In): 1.25Wiring Harness Length (mm): 209.55Black	View on Amazon

This table covers the harness connectors at the Vapor Canister Vent Valve / Solenoid. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Washer Pump Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: all 2021 Blazer engines	S2279	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Front	View on Amazon

This table covers the harness connectors at the Washer Pump. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Wiper Motor Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: all 2021 Blazer engines	S1423	🇺🇸 US 🇨🇦 CA 🇲🇽 MX		View on Amazon

This table covers the harness connectors at the Wiper Motor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Wire Terminal

Brand	Part Number	Markets	Notes	Buy
GM GENUINE Popular Fits: all 2021 Blazer engines	13582308	🇺🇸 US 🇨🇦 CA	Multi-PurposeWire Gauge Measurement: 1.00 GU Fitment notes — GM GENUINE 13582308 Multi-PurposeWire Gauge Measurement: 1.00 GUWiring Harness Length (In): 17.72 In	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	13576369	🇺🇸 US 🇨🇦 CA	Multi-PurposeWire Gauge Measurement: 0.50 GU Fitment notes — GM GENUINE 13576369 Multi-PurposeWire Gauge Measurement: 0.50 GU 0.5MM2	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	13575850	🇺🇸 US 🇨🇦 CA	Multi-Purpose Fitment notes — GM GENUINE 13575850 Multi-Purpose Labeled 135758501.0MM2	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	19119395	🇺🇸 US 🇨🇦 CA	Multi-PurposeWire Gauge Measurement: 1.00 GU Fitment notes — GM GENUINE 19119395 Multi-PurposeWire Gauge Measurement: 1.00 GU 1.0MM2	View on Amazon
GM GENUINE Fits: all 2021 Blazer engines	19370262	🇺🇸 US 🇨🇦 CA	Multi-PurposeColor: White Fitment notes — GM GENUINE 19370262 Multi-PurposeColor: WhiteConductor Material: CopperTerminal Gender: FemaleWire Gauge Measurement: 22 GUWire Length (In): 17.72 In	View on Amazon

This table covers the terminals crimped onto a harness lead.

Buying Electrical Connector Parts for a 2021 Chevrolet Blazer

On this vehicle, the connector system supplies the pigtails and connector bodies that terminate the vehicle harness at lamps, sensors and modules.

Match the engine first. Some electrical connector parts fit every engine; others are engine-specific. Each row shows which engine(s) it fits.
Read the notes on each row for position, trim and spec qualifiers before you order.
Where labor overlaps, use heat-shrink crimp connectors rather than twist-and-tape for any pigtail splice, especially outside the cabin.
Cross-reference the manufacturer part number against your old part or a service-manual listing.

Start with the largest groups on this page: Engine Wiring Harness / Connector and Body Wiring Harness / Connector .

Frequently Asked Questions

How many electrical connector parts fit the 2021 Chevrolet Blazer?

Our catalog currently lists 152 electrical connector parts for the 2021 Chevrolet Blazer across 44 subcategories and 10 brands, covering all 3 engine options (2.0L L4 Turbocharged, 2.5L L4 and 3.6L V6). Each part is matched to the engine(s) it fits.

Do electrical connector parts differ between 2021 Chevrolet Blazer engines?

Some do. 102 parts fit every engine; the other 50 are engine-specific. Each row (and the filter at the top) shows which. If you're unsure which engine you have, check the emissions label under the hood or the 8th character of your VIN.

What are the signs of electrical connector problems on a 2021 Chevrolet Blazer?

Common symptoms include intermittent faults that move when the harness is wiggled, green corrosion inside a plug, or melted connector housings near heat sources. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.

What should I replace at the same time?

Where labor overlaps, use heat-shrink crimp connectors rather than twist-and-tape for any pigtail splice, especially outside the cabin.

What do the market flags (US, CA, MX) on each part mean?

They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2021 Chevrolet Blazer was originally sold in the US, the safest choice is a part marked for the US market.

How do I make sure a part fits my 2021 Chevrolet Blazer?

First match the engine — each row shows which engine(s) the part fits. Then match the connector by terminal count and keyway, not just appearance — many families look identical but will not lock. The notes column carries position and trim qualifiers where they apply.

Other Parts for the 2021 Chevrolet Blazer

Belt Drive Body & Lamp Assembly Brake & Wheel Hub Cooling System Drivetrain Electrical Electrical Bulb & Socket Electrical Switch & Relay Engine Exhaust & Emission Fuel & Air Heat & Air Conditioning Ignition Interior Steering Suspension Automatic Transmission Wheel Wiper & Washer

Electrical Connector Parts for Other Chevrolet Blazer Years

2026 Chevrolet Blazer 2025 Chevrolet Blazer 2024 Chevrolet Blazer 2023 Chevrolet Blazer 2022 Chevrolet Blazer 2020 Chevrolet Blazer 2019 Chevrolet Blazer

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Manufacturer names, model designations and part numbers are used for identification and fitment reference only. AutoFactsDB is an independent catalog and is not affiliated with, endorsed by, or sponsored by any vehicle manufacturer displayed on this page.

Published by AutoFactsDB from manufacturer application data. How fitment is matched Report a fitment error