2021 Chevrolet Trailblazer Electrical Connector Parts: OEM & Replacement (71 Parts)

The 2021 Chevrolet Trailblazer has 71 electrical connector parts with verified fitment on this page — 21 part types and 4 brands, covering both the 1.2L L3 Turbocharged and the 1.3L L3 Turbocharged. Each part includes a manufacturer part number and application notes.

On the 2021 Chevrolet Trailblazer, the connector system supplies the pigtails and connector bodies that terminate the vehicle harness at lamps, sensors and modules. 37 parts of the 71 listed are Body Wiring Harness / Connector (16 parts), Engine Wiring Harness / Connector (12 parts) and Headliner Connector (9 parts). The other 18 part types cover the remaining 34 parts.

Accelerator Pedal Position Sensor Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: 1.3L L3 Turbocharged	S2912	🇺🇸 US 🇨🇦 CA		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: 1.3L L3 Turbocharged	85519071	🇺🇸 US 🇨🇦 CA	Black or Color: Natural Fitment notes — GM GENUINE 85519071 Black or Color: Natural Si Elec Code: B75CMultifunction Intake Air Sensor4-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 1.3L L3 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
STANDARD MOTOR PRODUCTS Fits: 1.3L L3 Turbocharged	S2894	🇺🇸 US 🇨🇦 CA	Intake Air	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: 1.3L L3 Turbocharged	84941154	🇺🇸 US 🇨🇦 CA	Black Fitment notes — ACDELCO 84941154 Black Si Elec Code: G13Generator X12-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 1.3L L3 Turbocharged	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

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.

Battery Current Sensor Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: 1.3L L3 Turbocharged	S2860	🇺🇸 US 🇨🇦 CA	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 Battery Current 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.

Body Wiring Harness / Connector

Brand	Part Number	Markets	Notes	Buy
ACDELCO Popular Fits: 1.3L L3 Turbocharged	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: 1.3L L3 Turbocharged	PT3702	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT3702 Black Si Elec Code: T10Keyless Entry Antenna2-Way Femalewith Leads1.5mm	View on Amazon
GM GENUINE Popular Fits: 1.3L L3 Turbocharged	PT2929	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT2929 Black Fits: Si Elec Code: B20Brake Fluid Level Switch2-Way Femalewith Leadsor Si Elec Code: B34DEngine Coolant Temperature Sensor 42-Way Femalewith Leadsor Si Elec Code: B203Radiator Coolant Temperature Sensor2-Way Femalewith Leads	View on Amazon
GM GENUINE Popular Fits: 1.3L L3 Turbocharged	84928314	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE 84928314 Black Fits: LeftService Information Electrical Code: X110Halogen Headlamps(T4A)Body Harness to Headlamp Assembly Harness8-Way Femalewith Leads or: RightService Information Electrical Code: X120Halogen Headlamps(T4A)Body Harness to Headlamp Assembly Harness8-Way Femalewith Leads	View on Amazon
ACDELCO Fits: 1.3L L3 Turbocharged	PT2715	🇺🇸 US 🇨🇦 CA	GM Original Equipment Fitment notes — ACDELCO PT2715 GM Original Equipment SI Electric Code: E8SREAR COMPARTMENT COURTESY LAMPBLACK2-WAY FEMALEwith Leads	View on Amazon
GM GENUINE Fits: 1.3L L3 Turbocharged	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: 1.3L L3 Turbocharged	PT3776	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT3776 Black Fits: Si Elec Code: B55Engine Hood Switch3-Way Femalewith Leads0.75MM2 or: Si Elec Code: X106Body Harness To Engine Hood Switch Jumper Harness3-Way Femalewith Leads0.75MM2	View on Amazon
GM GENUINE Fits: 1.3L L3 Turbocharged	PT3505	🇺🇸 US 🇨🇦 CA	BlackCrimping Tool Included: No Fitment notes — GM GENUINE PT3505 BlackCrimping Tool Included: NoShape: Square Si Elec Code: P12Horn2-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 1.3L L3 Turbocharged	13593220	🇺🇸 US 🇨🇦 CA	Windshield Washer Fluid Level SensorSi Elec Code: B118 Fitment notes — GM GENUINE 13593220 Windshield Washer Fluid Level SensorSi Elec Code: B118Gray2-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 1.3L L3 Turbocharged	PT3735	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT3735 Black Transmission Shift LeverSi Elec Code: S3.75mm26-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 1.3L L3 Turbocharged	PT3906	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT3906 Black Fits: RearLeftWheel Speed SensorSi Elec Code: B5LR2-Way Femalewith Leads or: RearRightWheel Speed SensorSi Elec Code: B5RR2-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 1.3L L3 Turbocharged	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 Leads or: RearLeftSide Impact SensorSi Elec Code: B63LR2-Way Femalewith Leads or: RearRightSide Impact SensorSi Elec Code: B63RR2-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 1.3L L3 Turbocharged	13529172	🇺🇸 US 🇨🇦 CA	Fits LeftService Information Electrical Code: F105L Fitment notes — GM GENUINE 13529172 Fits: LeftService Information Electrical Code: F105LRoof Rail Air BagGray with Yellow Cover2-Way Femalewith Leads or: RightService Information Electrical Code: F105RRoof Rail Air BagGray with Yellow Cover2-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 1.3L L3 Turbocharged	84869317	🇺🇸 US 🇨🇦 CA	SpeakerSubwoofer Fitment notes — GM GENUINE 84869317 SpeakerSubwooferSi Elec Code: P19ACGray4-Way Femalewith Leads1.5MM2	View on Amazon
GM GENUINE Fits: 1.3L L3 Turbocharged	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: 1.3L L3 Turbocharged	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 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: 1.3L L3 Turbocharged	S2506	🇺🇸 US 🇨🇦 CA	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: 1.3L L3 Turbocharged	86792094	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE 86792094 Black Fits: 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

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: 1.3L L3 Turbocharged	PT3921	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT3921 Black Si Elec Code: B26Crankshaft Position Sensor.75mm23-Way Femalewith Leads	View on Amazon
STANDARD MOTOR PRODUCTS Fits: 1.3L L3 Turbocharged	S2916	🇺🇸 US 🇨🇦 CA		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: 1.3L L3 Turbocharged	42694798	🇺🇸 US 🇨🇦 CA	AWD	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 Wiring Harness / Connector

Brand	Part Number	Markets	Notes	Buy
GM GENUINE Popular Fits: 1.3L L3 Turbocharged	PT2923	🇺🇸 US 🇨🇦 CA	Crimping Tool Included: NoLength: 12 in Fitment notes — GM GENUINE PT2923 Crimping Tool Included: NoLength: 12 inBlack Fits: Si Elec Code: B65Intake Manifold Pressure and Air Temperature Sensor4-Way Femalewith Leadsor Si Elec Code: X107Engine Harness To Engine Oil Pressure Control Solenoid Valve Harness4-Way Femalewith Leads	View on Amazon
GM GENUINE Popular Fits: 1.3L L3 Turbocharged	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	View on Amazon
GM GENUINE Popular Fits: 1.3L L3 Turbocharged	PT2929	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT2929 Black Service Information Electrical Code: Q12Evaporative Emission Purge Solenoid Valve2-Way Femalewith Leads	View on Amazon
ACDELCO Fits: 1.3L L3 Turbocharged	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: 1.3L L3 Turbocharged	84941154	🇺🇸 US 🇨🇦 CA	Black Fitment notes — ACDELCO 84941154 Black Starter Motor X1Si Elec Code: M642-Way Femalewith Leads	View on Amazon
ACDELCO Fits: 1.3L L3 Turbocharged	84785110	🇺🇸 US 🇨🇦 CA	GM Original Equipment Fitment notes — ACDELCO 84785110 GM Original Equipment BLACKAUTOMATIC TRANSMISSION ACCUMULATOR SOLENOID VALVE.75MM22-WAY FEMALEwith Leads	View on Amazon
ACDELCO Fits: 1.3L L3 Turbocharged	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: 1.3L L3 Turbocharged	84719651	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE 84719651 Black Transfer Case 2WD/4WD Actuator Position SensorSi Elec Code: B1393-Way Femalewith Leads1.5MM2	View on Amazon
GM GENUINE Fits: 1.3L L3 Turbocharged	13577534	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE 13577534 Black Si Elec Code: G18High Pressure Fuel Pump2-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 1.3L L3 Turbocharged	84928314	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE 84928314 Black Service Information Electrical Code: X175Engine Harness To Transmission Harness8-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 1.3L L3 Turbocharged	PT3534	🇺🇸 US 🇨🇦 CA	BlackShape: Oval Fitment notes — GM GENUINE PT3534 BlackShape: Oval Fits: Throttle BodySi Elec Code: Q386-Way Femalewith Leadsor Turbocharger Wastegate Solenoid ValveSi Elec Code: Q426-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 1.3L L3 Turbocharged	85786014	🇺🇸 US 🇨🇦 CA	9 speed Automatic trans.Transmission Control Module Fitment notes — GM GENUINE 85786014 9 speed Automatic trans.Transmission Control ModuleSi Elec Code: K71Black with Black TPA66-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 Injector Connector

Brand	Part Number	Markets	Notes	Buy
GM GENUINE Fits: 1.3L L3 Turbocharged	19352907	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE 19352907 Black SI ELEC CODE: X160ENGINE HARNESS TO FUEL INJECTOR HARNESS12-WAY FEMALEwithout LEADS	View on Amazon
GM GENUINE Fits: 1.3L L3 Turbocharged	13584788	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE 13584788 Black SI ELEC CODE: X160ENGINE HARNESS TO FUEL INJECTOR HARNESS16-WAY FEMALEwithout LEADS	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.

Headliner Connector

Brand	Part Number	Markets	Notes	Buy
ACDELCO Popular Fits: 1.3L L3 Turbocharged	PT2834	🇺🇸 US 🇨🇦 CA	GM Original Equipment Fitment notes — ACDELCO PT2834 GM Original Equipment Fits: LeftSI Electric Code: E37LRDOME/READING LAMPS - REARBLACK3-WAY FEMALEwith Leads or: RightSI Electric Code: E37RRDOME/READING LAMPS - REARBLACK3-WAY FEMALEwith Leads	View on Amazon
GM GENUINE Popular Fits: 1.3L L3 Turbocharged	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
ACDELCO Fits: 1.3L L3 Turbocharged	84880893	🇺🇸 US 🇨🇦 CA	GM Original Equipment Fitment notes — ACDELCO 84880893 GM Original Equipment WHITESUNROOF SUNSHADE SWITCHSI Electric Code: S904-WAY FEMALEwith Leads	View on Amazon
ACDELCO Fits: 1.3L L3 Turbocharged	PT3701	🇺🇸 US 🇨🇦 CA	GM Original Equipment Fitment notes — ACDELCO PT3701 GM Original Equipment Si Electric Code: E37ADome/Reading LampsBlack.75mm6-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 1.3L L3 Turbocharged	87815146	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE 87815146 Black Terminating ResistorHigh Speed BusSi Elec Code: R6A2-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 1.3L L3 Turbocharged	84724190	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE 84724190 Black Sunroof SwitchSi Elec Code: S724-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 1.3L L3 Turbocharged	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: 1.3L L3 Turbocharged	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: 1.3L L3 Turbocharged	13577390	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE 13577390 Black Si Electrical Code: A10Inside Rear View Mirror10-Way Femalewithout LeadsTerminated Leads 13575867	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: 1.3L L3 Turbocharged	1713412	🇺🇸 US 🇨🇦 CA	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.

Ignition Coil Connector

Brand	Part Number	Markets	Notes	Buy
GM GENUINE Fits: 1.3L L3 Turbocharged	PT2923	🇺🇸 US 🇨🇦 CA	Crimping Tool Included: NoLength: 12 in Fitment notes — GM GENUINE PT2923 Crimping Tool Included: NoLength: 12 inBlack Fits: 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: 1.3L L3 Turbocharged	85518225	🇺🇸 US 🇨🇦 CA	BlackGender: Male Fitment notes — GM GENUINE 85518225 BlackGender: MaleWire Gauge Measurement (GA.): 1.0 MM2 GA. Fits: 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
STANDARD MOTOR PRODUCTS Fits: 1.3L L3 Turbocharged	S2894	🇺🇸 US 🇨🇦 CA		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: 1.3L L3 Turbocharged	PT3865	🇺🇸 US 🇨🇦 CA	Si Electrical Code: X80Gray Fitment notes — GM GENUINE PT3865 Si Electrical Code: X80GrayAccessory Power Receptacle4.0MM23-Way Femalewith Leads	View on Amazon
GM GENUINE Popular Fits: 1.3L L3 Turbocharged	85761014	🇺🇸 US 🇨🇦 CA	BlackNumber Of Butt Connectors: 2 Fitment notes — GM GENUINE 85761014 BlackNumber Of Butt Connectors: 2 Si Elec Code: T10BKeyless Entry AntennaInstrument Panel Compartment2-Way Femalewith Leads	View on Amazon
ACDELCO Fits: 1.3L L3 Turbocharged	84815543	🇺🇸 US 🇨🇦 CA	GM Original Equipment Fitment notes — ACDELCO 84815543 GM Original Equipment SI Electric Code: K8BLOWER MOTOR CONTROL MODULE X1BLACK6-WAY FEMALEwith Leads	View on Amazon
ACDELCO Fits: 1.3L L3 Turbocharged	PT3529	🇺🇸 US 🇨🇦 CA	GM Original Equipment Fitment notes — ACDELCO PT3529 GM Original Equipment YELLOWPASSENGER INSTRUMENT PANEL AIR BAG4-WAY FEMALEwith Leads	View on Amazon
ACDELCO Fits: 1.3L L3 Turbocharged	PT3567	🇺🇸 US 🇨🇦 CA	GM Original Equipment Fitment notes — ACDELCO PT3567 GM Original Equipment SI Electric Code: S38IGNITION MODE SWITCHGRAY8-WAY FEMALEwith Leads	View on Amazon
GM GENUINE Fits: 1.3L L3 Turbocharged	84724190	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE 84724190 Black Si Elec Code: E40Electrical Auxiliary Heater4-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 1.3L L3 Turbocharged	13507121	🇺🇸 US 🇨🇦 CA	BlackTerminal Gender: Male Female Fitment notes — GM GENUINE 13507121 BlackTerminal Gender: Male Female Si Electrical Code: A11Radio X612-Way Femalewithout Leads	View on Amazon
GM GENUINE Fits: 1.3L L3 Turbocharged	13508196	🇺🇸 US 🇨🇦 CA	SI ELEC CODE: K43POWER STEERING CONTROL MODULE X2 Fitment notes — GM GENUINE 13508196 SI ELEC CODE: K43POWER STEERING CONTROL MODULE X2GREEN10-WAY FEMALEwithout LEADS	View on Amazon
GM GENUINE Fits: 1.3L L3 Turbocharged	13510218	🇺🇸 US 🇨🇦 CA	YELLOWSTEERING WHEEL AIR BAG COIL X1 Fitment notes — GM GENUINE 13510218 YELLOWSTEERING WHEEL AIR BAG COIL X1SI ELEC CODE: X8521-WAY FEMALEwithout 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
STANDARD MOTOR PRODUCTS Fits: 1.3L L3 Turbocharged	S2860	🇺🇸 US 🇨🇦 CA	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 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.

Mass Air Flow (MAF) Sensor Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: 1.3L L3 Turbocharged	S2894	🇺🇸 US 🇨🇦 CA		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: 1.3L L3 Turbocharged	PT2980	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT2980 Black Si Elec Code: B37BEngine Oil Pressure Sensor3-Way Femalewith Leads	View on Amazon
STANDARD MOTOR PRODUCTS Fits: 1.3L L3 Turbocharged	S2882	🇺🇸 US 🇨🇦 CA	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 Temperature Sender Connector

Brand	Part Number	Markets	Notes	Buy
GM GENUINE Fits: 1.3L L3 Turbocharged	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: 1.3L L3 Turbocharged	PT2979	🇺🇸 US 🇨🇦 CA	Si Elec Code: B52BHeated Oxygen Sensor 2 Fitment notes — GM GENUINE PT2979 Si Elec Code: B52BHeated Oxygen Sensor 2DK Gray4-Way Femalewith Leads	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: 1.3L L3 Turbocharged	S3064	🇺🇸 US 🇨🇦 CA	Rear Right	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.

Buying Electrical Connector Parts for a 2021 Chevrolet Trailblazer

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. Every electrical connector part here is 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: Body Wiring Harness / Connector and Engine Wiring Harness / Connector .

Frequently Asked Questions

How many electrical connector parts fit the 2021 Chevrolet Trailblazer?

Our catalog currently lists 71 electrical connector parts for the 2021 Chevrolet Trailblazer across 21 subcategories and 4 brands, covering both the 1.2L L3 Turbocharged and the 1.3L L3 Turbocharged. Each part is matched to the engine(s) it fits.

Do electrical connector parts differ between 2021 Chevrolet Trailblazer engines?

Yes. Every electrical connector part on this page is engine-specific. Each row shows which engine(s) it fits — use the filter at the top to hide the rest. 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 Trailblazer?

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 Trailblazer 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 Trailblazer?

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 Trailblazer

Belt Drive Body & Lamp Assembly Brake & Wheel Hub Cooling System Drivetrain Electrical Electrical Bulb & Socket

Electrical Connector Parts for Other Chevrolet Trailblazer Years

2026 Chevrolet Trailblazer 2025 Chevrolet Trailblazer 2024 Chevrolet Trailblazer 2023 Chevrolet Trailblazer 2022 Chevrolet Trailblazer

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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