2021 Chevrolet Express 3500 Electrical Connector Parts: OEM & Replacement (164 Parts)

This page lists 164 electrical connector parts for the 2021 Chevrolet Express 3500, across 44 part types, covering all 3 engine options (2.8L L4 DIESEL Turbocharged, 4.3L V6 and 6.6L V8). Every part shows its brand, manufacturer part number and fitment notes.

The connector system on the 2021 Chevrolet Express 3500 supplies the pigtails and connector bodies that terminate the vehicle harness at lamps, sensors and modules. The largest groups are Instrument Panel Connector (24 parts), Engine Wiring Harness / Connector (17 parts) and Chassis Wiring Harness / Connector (13 parts). The other 41 part types cover the remaining 110 parts.

A/C Compressor Clutch Coil Connector

Brand	Part Number	Markets	Notes	Buy
ACDELCO Fits: 6.6L V8	PT2311	🇺🇸 US 🇨🇦 CA	GoldColor: Gray	View on Amazon
STANDARD MOTOR PRODUCTS Fits: 6.6L V8	HP4490	🇺🇸 US 🇨🇦 CA	HandypackTerminal Type: Blade	View on Amazon
STANDARD MOTOR PRODUCTS Fits: 6.6L V8	S588	🇺🇸 US 🇨🇦 CA	Attachment Method: Push OnConnector Shape: Oval Fitment notes — STANDARD MOTOR PRODUCTS S588 Attachment Method: Push OnConnector Shape: OvalTerminal Type: Blade	View on Amazon

This table covers the harness connectors at the A/C Compressor Clutch 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.

Acceleration Sensor Connector

Brand	Part Number	Markets	Notes	Buy
DORMAN Fits: 6.6L V8	645234	🇺🇸 US 🇨🇦 CA	6 Cavity	View on Amazon

This table covers the harness connectors at the Acceleration 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: 6.6L V8	PT2922	🇺🇸 US 🇨🇦 CA	Si Elec Code: B75CMultifunction Intake Air Sensor Fitment notes — GM GENUINE PT2922 Si Elec Code: B75CMultifunction Intake Air SensorGray4-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	PT3827	🇺🇸 US 🇨🇦 CA	Fits Si Elec Code: B193ADK Gray Fitment notes — GM GENUINE PT3827 Fits: Si Elec Code: B193ADK GrayCharge Air Cooler Inlet Temperature Sensor2-Way Femalewith Leads2.0MM2 or: Si Elec Code: B193BDK GrayCharge Air Cooler Outlet Temperature Sensor2-Way Femalewith Leads2.0MM2	View on Amazon
GM GENUINE Fits: 6.6L V8	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: 6.6L V8	84941154	🇺🇸 US 🇨🇦 CA	Black Fitment notes — ACDELCO 84941154 Black Si Elec Code: G13Generator X12-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	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
WELLS Fits: 6.6L V8	1P3341	🇺🇸 US 🇨🇦 CA		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.

Blower Motor Control Module / Resistor Connector

Brand	Part Number	Markets	Notes	Buy
GPD Fits: 6.6L V8	1712230	🇺🇸 US 🇨🇦 CA	Blower Motor Resistor Pigtail	View on Amazon

This table covers the connectors at the blower resistor or control module. 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: 6.6L V8	PT146	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT146 Black Fits: RightSi Elec Code: E36ADDome LampRoof Rail2-Way Femalewith LeadsSquare or: LeftService Information Electrical Code: E36ACDome LampRoof Rail2-Way Femalewith LeadsSquar or: Service Information Electrical Code: E36AHDome Lamp2-Way Femalewith LeadsSquare	View on Amazon
GM GENUINE Popular Fits: 6.6L V8	PT2726	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT2726 Black Si Elec Code: X419Center High Mounted Stop Lamp Jumper Harness To Body Harness2-Way Malewith LeadsSquare	View on Amazon
GM GENUINE Fits: 6.6L V8	PT213	🇺🇸 US 🇨🇦 CA	RightSliding Door Jamb Contact Plate Fitment notes — GM GENUINE PT213 RightSliding Door Jamb Contact PlateBodySi Elec Code: X87RBNatural2-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	PT240	🇺🇸 US 🇨🇦 CA	RightSi Elec Code: B28F Fitment notes — GM GENUINE PT240 RightSi Elec Code: B28FRedDoor Ajar SwitchSliding2-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	PT2719	🇺🇸 US 🇨🇦 CA	BlackLength: 8.5 In Fitment notes — GM GENUINE PT2719 BlackLength: 8.5 In Fits: Si Elec Code: X329Instrument Panel Harness To Body Harness8-Way Malewith Leads or: RightService Information Electrical Code: X403Rear Cargo Door Harness to Body Harness8-Way Malewith Leadsor Service Information Electrical Code: X403Rear View Camera Harness to Body Harness8-Way Malewith Leadsor Si Elec Code: X319Auxiliary Heater Front Harness to Body Harness8-Way Malewith Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	PT267	🇺🇸 US 🇨🇦 CA	Service Information Electrical Code: X407Gray Fitment notes — GM GENUINE PT267 Service Information Electrical Code: X407GrayAuxiliary HVAC Harness to Body Harness6-Way Malewith Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	PT2623	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT2623 Black Fits: Si Elec Code: X323Air Bag Jumper Harness to Body Harness2-Way Malewith LeadsOvalor Si Elec Code: X324Air Bag Jumper Harness to Body Harness2-Way Malewith LeadsOval	View on Amazon
GM GENUINE Fits: 6.6L V8	PT3836	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT3836 Black 3 door4-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	PT1475	🇺🇸 US 🇨🇦 CA	Terminal Type: Blade PinBlack Fitment notes — GM GENUINE PT1475 Terminal Type: Blade PinBlack Si Elec Code: B176Multi-Axis Acceleration Sensor Module6-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	PT3907	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT3907 Black Fits: LeftSi Elec Code: X411Rear Cargo Door Harness to Body Harness6-Way Malewith LeadsMetri-Pack 280 or: LeftTail Lamp Assembly Harness to Body HarnessSi Elec Code: X4106-Way Malewith LeadsMetri-Pack 280 or: RightTail Lamp Assembly Harness to Body HarnessSi Elec Code: X4206-Way Malewith LeadsMetri-Pack 280	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 Fluid Level Sensor Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: 6.6L V8	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 Brake Fluid Level 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.

Camshaft Position Sensor Connector

Brand	Part Number	Markets	Notes	Buy
ACDELCO Fits: 6.6L V8	PT3940	🇺🇸 US 🇨🇦 CA	GM Original Equipment Fitment notes — ACDELCO PT3940 GM Original Equipment Si Electric Code: B23Camshaft Position SensorBlack3-Way Femalewith Leads1.0MM2	View on Amazon
DORMAN Fits: 6.6L V8	645325	🇺🇸 US 🇨🇦 CA	Black Fitment notes — DORMAN 645325 Black 3 Way Female with LeadsSi Electrical Code B23	View on Amazon
GM GENUINE Fits: 6.6L V8	84928314	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE 84928314 Black Si Elec Code: X130Engine Harness To Camshaft Position Sensor Jumper Harness8-Way Femalewith Leads	View on Amazon
WELLS Fits: 6.6L V8	1P3642	🇺🇸 US 🇨🇦 CA	Engine Harness to Camshaft Position Sensor Jumper Harness	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.

Chassis Wiring Harness / Connector

Brand	Part Number	Markets	Notes	Buy
GM GENUINE Popular Fits: 6.6L V8	PT2612	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT2612 Black Service Information Electrical Code: Q13Evaporative Emission Vent Solenoid Valve2-Way Femalewith Leads	View on Amazon
GM GENUINE Popular Fits: 6.6L V8	PT3910	🇺🇸 US 🇨🇦 CA	Service Information Electrical Code: G7Gray Fitment notes — GM GENUINE PT3910 Service Information Electrical Code: G7GrayCoolant Heater Fuel Pump2-Way Femalewith Leads	View on Amazon
GM GENUINE Popular Fits: 6.6L V8	PT2618	🇺🇸 US 🇨🇦 CA	BlackGender: Male Fitment notes — GM GENUINE PT2618 BlackGender: Male Si Elec Code: Q67Exhaust Aftertreatment Fuel Injector2-Way Femalewith Leads	View on Amazon
ACDELCO Fits: 6.6L V8	84727362	🇺🇸 US 🇨🇦 CA	GM Original Equipment Fitment notes — ACDELCO 84727362 GM Original Equipment EXHAUST TEMPERATURE SENSOR 4BLACK2-WAY FEMALEwith Leads	View on Amazon
ACDELCO Fits: 6.6L V8	PT3940	🇺🇸 US 🇨🇦 CA	GM Original Equipment Fitment notes — ACDELCO PT3940 GM Original Equipment DIESEL particulate filter Exhaust Differential Pressure SensorBlack3-Way Femalewith Leads1.0MM2	View on Amazon
GM GENUINE Fits: 6.6L V8	PT247	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT247 Black Si Elec Code: P3Backup Alarm2-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	PT3505	🇺🇸 US 🇨🇦 CA	BlackCrimping Tool Included: No Fitment notes — GM GENUINE PT3505 BlackCrimping Tool Included: NoShape: Square Fits: FrontLeftWheel Speed SensorSi Elec Code: B5LF2-Way Femalewith Leads or: FrontRightWheel Speed SensorSi Elec Code: B5RF2-Way Femalewith Leads or: RearLeftWheel Speed SensorSingle Rear Wheel (R04)Si Elec Code: B5LR2-Way Femalewith Leads or: RearRightWheel Speed SensorSingle Rear Wheel (R04)Si Elec Code: B5RR2-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	PT3691	🇺🇸 US 🇨🇦 CA	RearRight Fitment notes — GM GENUINE PT3691 RearRightWheel Speed SensorSi Elec Code: B5RRLT GrayExc. Single Rear Wheel (R04)2-Way Femalewith LeadsSealed, Key B2.0mm	View on Amazon
GM GENUINE Fits: 6.6L V8	PT3912	🇺🇸 US 🇨🇦 CA	Si Elec Code: B150Natural Fitment notes — GM GENUINE PT3912 Si Elec Code: B150NaturalFuel Tank Pressure Sensor3-Way Femalewith Leads1.5mm	View on Amazon
GM GENUINE Fits: 6.6L V8	PT3445	🇺🇸 US 🇨🇦 CA	Si Elec Code: B131CGray Fitment notes — GM GENUINE PT3445 Si Elec Code: B131CGrayExhaust Temperature Sensor 32-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	PT3509	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT3509 Black Si Elec Code: B47Fuel Pressure Sensor3-Way Femalewith Leads and CPA	View on Amazon
GM GENUINE Fits: 6.6L V8	PT3592	🇺🇸 US 🇨🇦 CA	Si Elec Code: X102LT Gray Fitment notes — GM GENUINE PT3592 Si Elec Code: X102LT GrayChassis Harness to Fuel Tank Harness8-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	PT1589	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT1589 Black Fits: Si Elec Code: E19Coolant Heater10-Way Femalewith Leadsor Si Elec Code: X405Chassis Harness To Chassis Harness10-Way Femalewith Leads	View on Amazon

This table covers the wiring-harness connectors at the Chassis. 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.

Coolant Level Sensor Connector

Brand	Part Number	Markets	Notes	Buy
GM GENUINE Fits: 6.6L V8	PT3910	🇺🇸 US 🇨🇦 CA	Service Information Electrical Code: B33Gray Fitment notes — GM GENUINE PT3910 Service Information Electrical Code: B33GrayEngine Coolant Level Switch2-Way Femalewith Leads	View on Amazon

This table covers the harness connectors at the Coolant Level 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
ACDELCO Fits: 6.6L V8	PT3940	🇺🇸 US 🇨🇦 CA	GM Original Equipment Fitment notes — ACDELCO PT3940 GM Original Equipment Si Electric Code: B26Crankshaft Position SensorBlack3-Way Femalewith Leads1.0MM2	View on Amazon
DORMAN Fits: 6.6L V8	645325	🇺🇸 US 🇨🇦 CA	Black Fitment notes — DORMAN 645325 Black 3 Way Female with LeadsSi Electrical Code B26	View on Amazon
HOLSTEIN Fits: 6.6L V8	2HAR0060	🇺🇸 US 🇨🇦 CA		View on Amazon
STANDARD MOTOR PRODUCTS Fits: 6.6L V8	S2316	🇺🇸 US 🇨🇦 CA	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.

Daytime Running Light Resistor Connector

Brand	Part Number	Markets	Notes	Buy
GM GENUINE Fits: 6.6L V8	PT3156	🇺🇸 US 🇨🇦 CA	Terminal Type: Blade PinBlack Fitment notes — GM GENUINE PT3156 Terminal Type: Blade PinBlack 3 doorDeep Tinted Glass (AJ1), Swing Out Glass (A18), Electric Rear Window Defogger (C49)2-Way Femalewith Leads	View on Amazon

This table covers the harness connectors at the Daytime Running Light Resistor. 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 Pressure Sensor Connector

Brand	Part Number	Markets	Notes	Buy
DORMAN Fits: 6.6L V8	645325	🇺🇸 US 🇨🇦 CA	Black Fitment notes — DORMAN 645325 Black 3 Way Female with LeadsSi Electrical Code B154	View on Amazon

This table covers the harness connectors at the Differential 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.

Door Lock Actuator Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: 6.6L V8	S1819	🇺🇸 US 🇨🇦 CA	Connector Shape: RectangleGender: Male Fitment notes — STANDARD MOTOR PRODUCTS S1819 Connector Shape: RectangleGender: MaleLength (In): 1.25Splice Connectors Included: YesWire Gauge (GA): 14 Rear RightSliding Door	View on Amazon

This table covers the harness connectors at the Door Lock 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.

Engine Wiring Harness / Connector

Brand	Part Number	Markets	Notes	Buy
GM GENUINE Popular Fits: 6.6L V8	PT2974	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT2974 Black Fits: Starter Motor X2Si Elec Code: M641-Way Femalewith Leadsor Si Elec Code: X103Engine Harness To Starter Jumper Harness1-Way Femalewith Leads	View on Amazon
GM GENUINE Popular Fits: 6.6L V8	PT209	🇺🇸 US 🇨🇦 CA	Si Elec Code: Q2Gray Fitment notes — GM GENUINE PT209 Si Elec Code: Q2GrayA/C Compressor Clutch2-Way Femalewith Leads	View on Amazon
GM GENUINE Popular Fits: 6.6L V8	PT2830	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT2830 Black Fits: Si Elec Code: X109Engine Harness To Underhood Lamp HarnessAccepts 1.5mm Terms2-Way FemaleMetri-Pack 150 Serieswith Leadsor Si Elec Code: KR81Auxiliary Battery Relay 1-X1Accepts 1.5MM Terms2-Way FemaleMetri-Pack 150 Serieswith Leads	View on Amazon
GM GENUINE Popular Fits: 6.6L V8	PT1134	🇺🇸 US 🇨🇦 CA	Si Electrical Code: R3Gray Fitment notes — GM GENUINE PT1134 Si Electrical Code: R3GrayBlower Motor Resistor6-Way Femalewith Leads	View on Amazon
ACDELCO Fits: 6.6L V8	84941154	🇺🇸 US 🇨🇦 CA	Black Fitment notes — ACDELCO 84941154 Black Fits: Si Elec Code: Q47Exhaust Gas Recirculation Cooler Bypass Solenoid Valve2-Way Femalewith Leadsor Si Elec Code: E45Positive Crankcase Ventilation Heater2-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	PT1511	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT1511 Black Si Elec Code: Q2A/C Compressor Clutch2-Way Malewith Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	PT3910	🇺🇸 US 🇨🇦 CA	Fits Service Information Electrical Code: B1BGray Fitment notes — GM GENUINE PT3910 Fits: Service Information Electrical Code: B1BGrayAir Conditioning Low Side Pressure Switch2-Way Femalewith Leadsor Service Information Electrical Code: P13Horn AssemblyGray2-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	87815146	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE 87815146 Black Fits: Terminating ResistorHigh Speed BusSi Electrical Code: R6A2-Way Femalewith Leadsor Si Electrical Code: R10Cooling Fan Resistor2-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	PT2923	🇺🇸 US 🇨🇦 CA	Crimping Tool Included: NoLength: 12 in Fitment notes — GM GENUINE PT2923 Crimping Tool Included: NoLength: 12 inBlack Si Elec Code: B47BFuel Rail Pressure Sensor4-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	PT2971	🇺🇸 US 🇨🇦 CA	Gender: MaleTerminal Type: Blade Fitment notes — GM GENUINE PT2971 Gender: MaleTerminal Type: BladeBlack Fits: Si Elec Code: Q47Exhaust Gas Recirculation Cooler Bypass Solenoid Valve2-Way Femalewith Leadsor Si Elec Code: E45Positive Crankcase Ventilation Heater2-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	PT2929	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT2929 Black Fits: Si Elec Code: B20Brake Fluid Level Switch2-Way Femalewith Leadsor Si Elec Code: B35Engine Oil Level Switch2-Way Femalewith Leadsor Service Information Electrical Code: Q12Evaporative Emission Purge Solenoid Valve2-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	PT3612	🇺🇸 US 🇨🇦 CA	BlackTerminal Gender: Female Fitment notes — GM GENUINE PT3612 BlackTerminal Gender: FemaleWidth: 6 in Si Elec Code: X142Engine Harness To Cooling Fan Clutch Jumper Harness6-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	PT3509	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT3509 Black Si Elec Code: B18Battery Current Sensor3-Way Femalewith Leads and CPA	View on Amazon
GM GENUINE Fits: 6.6L V8	PT3098	🇺🇸 US 🇨🇦 CA	BlackLength: 8 In Fitment notes — GM GENUINE PT3098 BlackLength: 8 InTerminal Gender: Female Si Electric Code: X112Engine Harness To Intake Manifold Pressure Air Temperature Sensor Jumper Harness4-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	PT3534	🇺🇸 US 🇨🇦 CA	BlackShape: Oval Fitment notes — GM GENUINE PT3534 BlackShape: Oval Fits: Throttle BodySi Elec Code: Q386-Way Femalewith Leadsor Si Elec Code: Q20Intake Air Flow Valve6-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	PT3793	🇺🇸 US 🇨🇦 CA	Si Elec Code: Q14Exhaust Gas Recirculation Valve Fitment notes — GM GENUINE PT3793 Si Elec Code: Q14Exhaust Gas Recirculation ValveBrown6-Way Femalewith Leads1.0MM2	View on Amazon
GM GENUINE Fits: 6.6L V8	84880894	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE 84880894 Black 2-Way Femalewith 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.

Exhaust Gas Temperature (EGT) Sensor Connector

Brand	Part Number	Markets	Notes	Buy
ACDELCO Fits: 6.6L V8	84727362	🇺🇸 US 🇨🇦 CA	GM Original Equipment Fitment notes — ACDELCO 84727362 GM Original Equipment Fits: EXHAUST GAS RECIRCULATION TEMPERATURE SENSOR 2BLACK2-WAY FEMALEwith Leadsor EXHAUST TEMPERATURE SENSOR 1BLACK2-WAY FEMALEwith Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	PT3445	🇺🇸 US 🇨🇦 CA	Si Elec Code: B130AGray Fitment notes — GM GENUINE PT3445 Si Elec Code: B130AGrayExhaust Gas Recirculation Temperature Sensor 12-Way Femalewith Leads	View on Amazon

This table covers the harness connectors at the Exhaust Gas Temperature (EGT) 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 Injection Pressure Regulator Connector

Brand	Part Number	Markets	Notes	Buy
ACDELCO Fits: 6.6L V8	84941154	🇺🇸 US 🇨🇦 CA	Black Fitment notes — ACDELCO 84941154 Black Si Elec Code: Q18AFuel Pressure Regulator 12-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	PT2971	🇺🇸 US 🇨🇦 CA	Gender: MaleTerminal Type: Blade Fitment notes — GM GENUINE PT2971 Gender: MaleTerminal Type: BladeBlack Si Elec Code: Q18AFuel Pressure Regulator 12-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	PT3508	🇺🇸 US 🇨🇦 CA	BlackShape: Oval Fitment notes — GM GENUINE PT3508 BlackShape: Oval Si Elec Code: Q18BFuel Pressure Regulator 22-Way Femalewith Leads	View on Amazon

This table covers the harness connectors at the Fuel Injection Pressure Regulator. 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 Injection Pressure Sensor Connector

Brand	Part Number	Markets	Notes	Buy
DORMAN Fits: 6.6L V8	645325	🇺🇸 US 🇨🇦 CA	Black Fitment notes — DORMAN 645325 Black 3 Way Female with LeadsSi Electrical Code B47	View on Amazon
STANDARD MOTOR PRODUCTS Fits: 6.6L V8	S2894	🇺🇸 US 🇨🇦 CA	At Fuel Rail	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
GM GENUINE Popular Fits: 6.6L V8	PT3739	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT3739 Black Fits: Wire Size 2.5mm2Si Elec Code: Q17AFuel Injector 12-Way Femalewith Leadsor Wire Size 2.5mm2Si Elec Code: Q17BFuel Injector 22-Way Femalewith Leadsor Wire Size 2.5mm2Si Elec Code: Q17CFuel Injector 32-Way Femalewith Leadsor Wire Size 2.5mm2Si Elec Code: Q17DFuel Injector 42-Way Femalewith Leads	View on Amazon
GB REMANUFACTURING Fits: 6.6L V8	5191	🇺🇸 US 🇨🇦 CA		View on Amazon
GM GENUINE Fits: 6.6L V8	19352907	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE 19352907 Black Fits: SI ELEC CODE: X160ENGINE HARNESS TO FUEL INJECTOR HARNESS12-WAY FEMALEwithout LEADS or: Si Electrical Code: X161Engine Harness to Fuel Injector Harness12-Way Femalewithout Leads	View on Amazon
STANDARD MOTOR PRODUCTS Fits: 6.6L V8	HP4347	🇺🇸 US 🇨🇦 CA	Handypack Fitment notes — STANDARD MOTOR PRODUCTS HP4347 Handypack Indirect InjectorColor Code Black and Redwith 2 Female Terminals	View on Amazon
STANDARD MOTOR PRODUCTS Fits: 6.6L V8	S1895	🇺🇸 US 🇨🇦 CA	Number of Splice Connectors Included: 2 Fitment notes — STANDARD MOTOR PRODUCTS S1895 Number of Splice Connectors Included: 2 Indirect InjectorColor Code Black and Redwith 2 Female Terminals	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 Tank Pressure Sensor Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: 6.6L V8	S1445	🇺🇸 US 🇨🇦 CA	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
GM GENUINE Popular Fits: 6.6L V8	PT2965	🇺🇸 US 🇨🇦 CA	Fits LeftSi Elec Code: E4G Fitment notes — GM GENUINE PT2965 Fits: LeftSi Elec Code: E4GHeadlampLow BeamGray2-Way Femalewith Leads or: RightSi Elec Code: E4HHeadlampLow BeamGray2-Way Femalewith Leads	View on Amazon
GM GENUINE Popular Fits: 6.6L V8	PT168	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT168 Black Fits: LeftSi Elec Code: E4EHeadlampHigh Beam2-Way Femalewith Leads or: RightSi Elec Code: E4FHeadlampHigh Beam2-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	PT248	🇺🇸 US 🇨🇦 CA	Si Elec Code: B9Green Fitment notes — GM GENUINE PT248 Si Elec Code: B9GreenAmbient Air Temperature Sensor2-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	PT247	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT247 Black Fits: Side Marker LampLeft FrontSi Elec Code: E2LF2-Way Femalewith Leadsor Side Marker LampRight FrontSi Elec Code: E2RF2-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	PT3855	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT3855 Black Si Elec Code: B55Engine Hood Switch3-Way Femalewith Leads1.5MM2	View on Amazon
GM GENUINE Fits: 6.6L V8	PT114	🇺🇸 US 🇨🇦 CA	Shape: RectangularBlack Fitment notes — GM GENUINE PT114 Shape: RectangularBlack Fits: LeftSi Elec Code: E4NPark/Turn Signal Lamp3-Way Femalewith Leads or: RightSi Elec Code: E4PPark/Turn Signal Lamp3-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	PT1484	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT1484 Black Si Electrical Code: X50AFuse BlockUnderhood X416-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: 6.6L V8	PT2834	🇺🇸 US 🇨🇦 CA	GM Original Equipment Fitment notes — ACDELCO PT2834 GM Original Equipment Fits: SI Electric Code: E37FDOME/READING LAMPS - FRONTBLACK3-WAY FEMALEwith Leadsor SI Electric Code: E37MDOME/READING LAMPS - MIDDLEBLACK3-WAY FEMALEwith Leadsor SI Electric Code: E37RDOME/READING LAMPS - REARBLACK3-WAY FEMALEwith Leads	View on Amazon
GM GENUINE Popular Fits: 6.6L V8	PT2726	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT2726 Black Fits: RightSunshadeSi Elec Code: A3R2-Way Malewith LeadsSquar or: Service Information Electric Code: B24Mobile Telephone Microphone2-Way Malewith LeadsSquare	View on Amazon
GM GENUINE Fits: 6.6L V8	PT150	🇺🇸 US 🇨🇦 CA	Si Elec Code: S34FNatural Fitment notes — GM GENUINE PT150 Si Elec Code: S34FNaturalHVAC Controls Switch AssemblyAuxiliary Front10-Way FemaleMetri-Pack 150with Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	PT1404	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT1404 Black Si Electrical Code: A10Inside Rear View Mirror16-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	13576634	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE 13576634 Black Si Electrical Code: B174WFrontview CameraWindshield10-Way Femalewithout Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	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
GM GENUINE Fits: 6.6L V8	13584788	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE 13584788 Black SI ELEC CODE: X205HEADLINER HARNESS TO BODY HARNESS16-WAY FEMALEwithout LEADS	View on Amazon
GM GENUINE Fits: 6.6L V8	19369662	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE 19369662 Black Si Electrical Code: X204Body Harness to Headliner Harness16-Way Malewithout Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	PT210	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT210 Black Si Elec Code: K33AHVAC Control ModuleAuxiliary12-Way Femalewith Leadswith Cover	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.

Heater Air Door Actuator Connector

Brand	Part Number	Markets	Notes	Buy
FOUR SEASONS Fits: 6.6L V8	37280	🇺🇸 US 🇨🇦 CA	Fits 6 Terminal MaleBlendor 6 Terminal Male Fitment notes — FOUR SEASONS 37280 Fits: 6 Terminal MaleBlendor 6 Terminal MaleMode	View on Amazon

This table covers the harness connectors at the Heater Air Door 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.

HVAC Control Switch / Panel Connector

Brand	Part Number	Markets	Notes	Buy
GPD Fits: 6.6L V8	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
STANDARD MOTOR PRODUCTS Popular Fits: 6.6L V8	HP4485	🇺🇸 US 🇨🇦 CA	HandypackWiring Harness Length (mm): 304.8 Fitment notes — STANDARD MOTOR PRODUCTS HP4485 HandypackWiring Harness Length (mm): 304.8 Original Equipment Design	View on Amazon
ACDELCO Fits: 6.6L V8	PT2368	🇺🇸 US 🇨🇦 CA	GoldShape: Rectangle Fitment notes — ACDELCO PT2368 GoldShape: Rectangle Original Equipment Design	View on Amazon
GM GENUINE Fits: 6.6L V8	PT3886	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT3886 Black 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 Leadsor Si Elec Code: T8GIgnition Coil 74-Way Femalewith Leadsor Si Elec Code: T8HIgnition Coil 84-Way Femalewith Leads	View on Amazon
STANDARD MOTOR PRODUCTS Fits: 6.6L V8	S761	🇺🇸 US 🇨🇦 CA	Wiring Harness Length (mm): 304.8 Fitment notes — STANDARD MOTOR PRODUCTS S761 Wiring Harness Length (mm): 304.8 Original Equipment Design	View on Amazon
STANDARD MOTOR PRODUCTS Fits: 6.6L V8	S2903	🇺🇸 US 🇨🇦 CA	Updated Design	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: 6.6L V8	PT2830	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT2830 Black Windshield Washer PumpSi Elec Code: G24Accepts 1.5mm Terms2-Way FemaleMetri-Pack 150 Serieswith Leads	View on Amazon
GM GENUINE Popular Fits: 6.6L V8	PT3910	🇺🇸 US 🇨🇦 CA	Service Information Electrical Code: X141Instrument Panel Harness to Brake Fluid Level Switch Harness Fitment notes — GM GENUINE PT3910 Service Information Electrical Code: X141Instrument Panel Harness to Brake Fluid Level Switch HarnessGray2-Way Femalewith Leads	View on Amazon
GM GENUINE Popular Fits: 6.6L V8	PT288	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT288 Black Si Elec Code: X104Instrument Panel Harness To Air Bag Jumper Harness2-Way Femalewith Leads	View on Amazon
GM GENUINE Popular Fits: 6.6L V8	PT3847	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT3847 Black Si Electric Code: S34HVAC Controls Switch Assembly X13-Way Femalewith Leads2.5MM2	View on Amazon
GM GENUINE Popular Fits: 6.6L V8	PT1346	🇺🇸 US 🇨🇦 CA	BlackConnector Fitment notes — GM GENUINE PT1346 BlackConnector Si Electric Code: S34HVAC Controls Switch Assembly X28-Way Femalewith Leads7-12GA and 4-18GA as Required	View on Amazon
GM GENUINE Fits: 6.6L V8	PT146	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT146 Black Si Elec Code: B10Ambient Light Sensor2-Way Femalewith LeadsSquare	View on Amazon
GM GENUINE Fits: 6.6L V8	PT1165	🇺🇸 US 🇨🇦 CA	Si Elec Code: X220Instrument Panel Harness To Park Brake Switch Jumper Harness Fitment notes — GM GENUINE PT1165 Si Elec Code: X220Instrument Panel Harness To Park Brake Switch Jumper HarnessGray2-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	PT319	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT319 Black Si Elec Code: M6Air Temperature Door Actuator6-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	PT548	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT548 Black Si Electric Code: S34HVAC Controls Switch Assembly X34-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	PT2836	🇺🇸 US 🇨🇦 CA	YellowSi Elec Code: X330 Fitment notes — GM GENUINE PT2836 YellowSi Elec Code: X330Instrument Panel Harness To Body Harness4-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	PT2773	🇺🇸 US 🇨🇦 CA	Service Information Electrical Code: K77Remote Control Door Lock Receiver Fitment notes — GM GENUINE PT2773 Service Information Electrical Code: K77Remote Control Door Lock ReceiverGreen4-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	PT1071	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT1071 Black Traction Control SwitchSi Electrical Code: S756-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	PT382	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT382 Black Towith Haul Mode SwitchSi Elec Code: S744-Way Femalewith LeadsSquare	View on Amazon
GM GENUINE Fits: 6.6L V8	PT3865	🇺🇸 US 🇨🇦 CA	Fits Si Electrical Code: X80AGray Fitment notes — GM GENUINE PT3865 Fits: Si Electrical Code: X80AGrayAccessory Power ReceptacleCenter Console 14.0MM23-Way Femalewith Leadsor Si Electrical Code: X80BGrayAccessory Power ReceptacleCenter Console 24.0MM23-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	PT3736	🇺🇸 US 🇨🇦 CA	Si Elec Code: X206LT Gray Fitment notes — GM GENUINE PT3736 Si Elec Code: X206LT GrayInstrument Panel Harness to Instrument Panel Harness2-Way Femalewith Leads1.5MM2	View on Amazon
GM GENUINE Fits: 6.6L V8	PT2038	🇺🇸 US 🇨🇦 CA	YellowSteering Wheel Air Bag Coil X3 Fitment notes — GM GENUINE PT2038 YellowSteering Wheel Air Bag Coil X3Si Elec Code: X854-Way MaleMetri-Pack 280with Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	PT1101	🇺🇸 US 🇨🇦 CA	Splice PackSi Elec Code: JX200 Fitment notes — GM GENUINE PT1101 Splice PackSi Elec Code: JX200Gray12-Way Femalewith Leads and CapGT150	View on Amazon
GM GENUINE Fits: 6.6L V8	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: 6.6L V8	PT1502	🇺🇸 US 🇨🇦 CA	Telematics Communication Interface Control Module X2Si Electric Code: K73 Fitment notes — GM GENUINE PT1502 Telematics Communication Interface Control Module X2Si Electric Code: K73Natural12-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	PT1404	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT1404 Black Telematics Communication Interface Control Module X1Si Electric Code: K7316-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	PT2888	🇺🇸 US 🇨🇦 CA	Windshield Wiper MotorService Information Electrical Code: M75 Fitment notes — GM GENUINE PT2888 Windshield Wiper MotorService Information Electrical Code: M75Gray5-Way Femalewith Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	PT3799	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT3799 Black Si Elec Code: X225Accelerator Pedal Position Sensor Harness to Instrument Panel Harness6-Way Malewith Leads1.5MM2	View on Amazon
GM GENUINE Fits: 6.6L V8	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
HOLSTEIN Fits: 6.6L V8	2HAR0023	🇺🇸 US 🇨🇦 CA	Blackwith 3 Female Terminals Fitment notes — HOLSTEIN 2HAR0023 Blackwith 3 Female Terminalswith 2.5mm Lead Wires	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: 6.6L V8	19301207	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE 19301207 Black Fits: Si Elec Code: B68BKnock Sensor 22-Way Femalewith Leadsor Si Elec Code: B68AKnock Sensor 12-Way Femalewith Leads	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: 6.6L V8	PT944	🇺🇸 US 🇨🇦 CA	Evaporator Emission Control ConnectorAt Fuel Tank Pressure Sensor	View on Amazon
WELLS Fits: 6.6L V8	1P2218	🇺🇸 US 🇨🇦 CA		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.

Oil Pressure Sender / Switch Connector

Brand	Part Number	Markets	Notes	Buy
GM GENUINE Fits: 6.6L V8	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: 6.6L V8	86801953	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE 86801953 Black Si Elec Code: X155Engine Harness To Engine Oil Pressure Sensor Jumper Harness6-Way Femalewith Leads1.52mm	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: 6.6L V8	12681015	🇺🇸 US 🇨🇦 CA	Mating Connector Use 13587326Jumper 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: 6.6L V8	PT2930	🇺🇸 US 🇨🇦 CA	Si Elec Code: B36Gray Fitment notes — GM GENUINE PT2930 Si Elec Code: B36GrayEngine Oil Temperature Sensor2-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: 6.6L V8	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 Leads	View on Amazon
GM GENUINE Fits: 6.6L V8	85877333	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE 85877333 Black Fits: Si Elec Code: B52CHeated Oxygen SensorBank 1 Sensor 1or Si Elec Code: B52EHeated Oxygen SensorBank 2 Sensor 1	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 Aid Sensor Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: 6.6L V8	S1497	🇺🇸 US 🇨🇦 CA	Rear	View on Amazon

This table covers the harness connectors at the Parking Aid 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.

Power Window Switch Connector

Brand	Part Number	Markets	Notes	Buy
ACDELCO Fits: 6.6L V8	PT2372	🇺🇸 US 🇨🇦 CA	Gold Fitment notes — ACDELCO PT2372 Gold Rightwith 8 Terminal (S)	View on Amazon
STANDARD MOTOR PRODUCTS Fits: 6.6L V8	S804	🇺🇸 US 🇨🇦 CA	Length (In): 0.875Wire Gauge (GA): 14 Fitment notes — STANDARD MOTOR PRODUCTS S804 Length (In): 0.875Wire Gauge (GA): 14Wiring Harness Length (mm): 215.9 Rightwith 8 Terminal(s)	View on Amazon
STANDARD MOTOR PRODUCTS Fits: 6.6L V8	S1793	🇺🇸 US 🇨🇦 CA	Black Fitment notes — STANDARD MOTOR PRODUCTS S1793 Black Leftwith 8 Terminal(s)	View on Amazon

This table covers the harness connectors at the Power Window 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.

Side Marker Lamp Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: 6.6L V8	S689	🇺🇸 US 🇨🇦 CA	Connector Shape: Rectangleblack Fitment notes — STANDARD MOTOR PRODUCTS S689 Connector Shape: RectangleblackFront	View on Amazon

This table covers the harness connectors at the Side Marker Lamp. 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.

Speaker Connector

Brand	Part Number	Markets	Notes	Buy
GM GENUINE Fits: 6.6L V8	PT3835	🇺🇸 US 🇨🇦 CA	Black Fitment notes — GM GENUINE PT3835 Black Fits: 3 doorLS Model or LT Modelindex tab center cavity And2-Way Femalewith Leads1.5MM2 or: Extended Cargo Van or Standard Cargo Van3 doorInterior Trim Panels (5L3)index tab center cavity And2-Way Femalewith Leads1.5MM2 or: Extended Cargo Van or Standard Cargo Van3 doorindex tab center cavity AndExcept Interior Trim Panels (5L3)Connected Touchscreen Stereo with CD, Auxiliary Jack, USB Port and XM (UI8) or Stereo with CD Player (US8)2-Way Femalewith Leads1.5MM2	View on Amazon
GM GENUINE Fits: 6.6L V8	25962569	🇺🇸 US 🇨🇦 CA	Fits Rear3 door Fitment notes — GM GENUINE 25962569 Fits: Rear3 doorLS Model or LT Model or: RearExtended Cargo Van or Standard Cargo Van3 doorInterior Trim Panels (5L3) or: RearExtended Cargo Van or Standard Cargo Van3 doorExcept Interior Trim Panels (5L3)Connected Touchscreen Stereo with CD, Auxiliary Jack, USB Port and XM (UI8), Stereo with CD Player (US8)	View on Amazon

This table covers the harness connectors at the Speaker. 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.

Starter Solenoid Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: 6.6L V8	S2984	🇺🇸 US 🇨🇦 CA		View on Amazon
WELLS Fits: 6.6L V8	1P3645	🇺🇸 US 🇨🇦 CA		View on Amazon

This table covers the harness connectors at the Starter 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.

Steering Column Wiring Harness

Brand	Part Number	Markets	Notes	Buy
GM GENUINE Fits: 6.6L V8	84026839	🇺🇸 US 🇨🇦 CA		View on Amazon

This table covers the Steering Column Wiring harnesses.

Temperature Sender / Sensor Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: 6.6L V8	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 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: 6.6L V8	S2409	🇺🇸 US 🇨🇦 CA	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: 6.6L V8	57101	🇺🇸 US 🇨🇦 CA	7-Way Round RV To 4-Way Flat Adapter Fitment notes — CURT 57101 7-Way Round RV To 4-Way Flat Adapter with 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: 6.6L V8	55415	🇺🇸 US 🇨🇦 CA	Replacement 7-Way RV Blade OEM Socket Fitment notes — CURT 55415 Replacement 7-Way RV Blade OEM Socket with Factory Tow Package	View on Amazon
CURT Popular Fits: 6.6L V8	56229	🇺🇸 US 🇨🇦 CA	7-Way USCAR Electrical ConnectorLength: 24 in. Fitment notes — CURT 56229 7-Way USCAR Electrical ConnectorLength: 24 in.Bonded Wire with Factory Tow Package	View on Amazon
STANDARD MOTOR PRODUCTS Popular Fits: 6.6L V8	TC656	🇺🇸 US 🇨🇦 CA	with Towing PackageOE Style	View on Amazon
CURT Fits: 6.6L V8	56415	🇺🇸 US 🇨🇦 CA	Replacement 7-Way RV Blade OEM SocketTwist-In Fitment notes — CURT 56415 Replacement 7-Way RV Blade OEM SocketTwist-In with Factory Tow Package	View on Amazon
CURT Fits: 6.6L V8	55515	🇺🇸 US 🇨🇦 CA	Custom Wiring ConnectorOE 4-Way Flat Fitment notes — CURT 55515 Custom Wiring ConnectorOE 4-Way FlatPlugs Into USCAR Replacement2-Wire Systemwith Factory Tow Package	View on Amazon
CURT Fits: 6.6L V8	56515	🇺🇸 US 🇨🇦 CA	Custom Wiring Connector5-Way Flat Fitment notes — CURT 56515 Custom Wiring Connector5-Way Flat 2-Wire Systemwith Factory Tow Package	View on Amazon
CURT Fits: 6.6L V8	55774	🇺🇸 US 🇨🇦 CA	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 with Factory Tow Package	View on Amazon
CURT Fits: 6.6L V8	57015	🇺🇸 US 🇨🇦 CA	OEM Replacement Dual-Output 7 and 4 Way ConnectorPlugs Into USCAR Socket	View on Amazon
CURT Fits: 6.6L V8	55384	🇺🇸 US 🇨🇦 CA	Custom Wiring Connector4-Way Flat Fitment notes — CURT 55384 Custom Wiring Connector4-Way FlatRetains Use of 7 Way Round Connector 2-Wire Systemwith Factory Tow Package	View on Amazon
CURT Fits: 6.6L V8	57020	🇺🇸 US 🇨🇦 CA	OEM Replacement Dual-Output 7 and 4 Way ConnectorPackaged Fitment notes — CURT 57020 OEM Replacement Dual-Output 7 and 4 Way ConnectorPackaged Factory TowPlugs Into USCAR	View on Amazon
CURT Fits: 6.6L V8	56584	🇺🇸 US 🇨🇦 CA	Custom Wiring Harness5-Way Flat Fitment notes — CURT 56584 Custom Wiring Harness5-Way FlatRetains Use Of 7-Way OEM 2-Wire Systemwith Factory Tow Package	View on Amazon
STANDARD MOTOR PRODUCTS Fits: 6.6L V8	TC654	🇺🇸 US 🇨🇦 CA	with Towing Packagewith 7 Way	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: 6.6L V8	56475	🇺🇸 US 🇨🇦 CA	Custom Wiring Harness Extension Fitment notes — CURT 56475 Custom Wiring Harness Extension 20"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.

Wire Terminal

Brand	Part Number	Markets	Notes	Buy
GM GENUINE Popular Fits: 6.6L V8	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: 6.6L V8	19351723	🇺🇸 US 🇨🇦 CA	Multi-PurposeWire Gauge Measurement: 2.00 GU Fitment notes — GM GENUINE 19351723 Multi-PurposeWire Gauge Measurement: 2.00 GUWiring Harness Length (In): 17.72 In	View on Amazon
GM GENUINE Fits: 6.6L V8	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: 6.6L V8	13576377	🇺🇸 US 🇨🇦 CA	Multi-PurposeWire Gauge Measurement: 6.00 GU Fitment notes — GM GENUINE 13576377 Multi-PurposeWire Gauge Measurement: 6.00 GU 3.0MM2	View on Amazon
GM GENUINE Fits: 6.6L V8	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

This table covers the terminals crimped onto a harness lead.

Buying Electrical Connector Parts for a 2021 Chevrolet Express 3500

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: Instrument Panel Connector and Engine Wiring Harness / Connector .

Frequently Asked Questions

How many electrical connector parts fit the 2021 Chevrolet Express 3500?

Our catalog currently lists 164 electrical connector parts for the 2021 Chevrolet Express 3500 across 44 subcategories and 11 brands, covering all 3 engine options (2.8L L4 DIESEL Turbocharged, 4.3L V6 and 6.6L V8). Each part is matched to the engine(s) it fits.

Do electrical connector parts differ between 2021 Chevrolet Express 3500 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 Express 3500?

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 Express 3500 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 Express 3500?

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 Express 3500

Belt Drive Body & Lamp Assembly Brake & Wheel Hub Cooling System Drivetrain Electrical Electrical Bulb & Socket Electrical Switch & Relay Engine Exhaust & Emission Fuel & Air

Electrical Connector Parts for Other Chevrolet Express 3500 Years

2026 Chevrolet Express 3500 2025 Chevrolet Express 3500 2024 Chevrolet Express 3500 2023 Chevrolet Express 3500 2022 Chevrolet Express 3500 2020 Chevrolet Express 3500 2019 Chevrolet Express 3500 2018 Chevrolet Express 3500

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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