25 Electrical connector parts are listed for the 2021 Chevrolet Silverado 3500, in 14 part types, covering both the 6.6L V8 and the 6.6L V8 DIESEL Turbocharged. Each one has a brand, a manufacturer part number and notes that say where it fits.
On the 2021 Chevrolet Silverado 3500, the connector system supplies the pigtails and connector bodies that terminate the vehicle harness at lamps, sensors and modules. 11 parts of the 25 listed are Chassis Wiring Harness / Connector (4 parts), Diesel Exhaust Fluid (DEF) Pump Wiring Harness / Connector (4 parts) and Camshaft Position Sensor Connector (3 parts). The other 11 part types cover the remaining 14 parts.
The 2021 Chevrolet Silverado 3500 was sold with both the 6.6L V8 and the 6.6L V8 DIESEL Turbocharged. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
6 brands supply electrical connector parts for the 2021 Chevrolet Silverado 3500, led by STANDARD MOTOR PRODUCTS (11 parts), GM GENUINE (8 parts) and HOLSTEIN (2 parts), plus 3 more brands.
Each part number listed for the 2021 Chevrolet Silverado 3500 opens a page with every vehicle that part fits.
Accelerator Pedal Position Sensor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 6.6L V8 DIESEL Turbocharged | S1478 | 🇺🇸 US 🇨🇦 CA | 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.
This group shows a single part: STANDARD MOTOR PRODUCTS S1478.
Alternator / Generator Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 6.6L V8 DIESEL Turbocharged | S1477 | 🇺🇸 US 🇨🇦 CA | without Wiring Harness | 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.
This group shows a single part: STANDARD MOTOR PRODUCTS S1477.
Brake Pad Wear Sensor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 6.6L V8 DIESEL Turbocharged | S2936 | 🇺🇸 US 🇨🇦 CA | Front | View on Amazon |
This table covers the harness connectors at the Brake Pad Wear 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.
One part is listed for the 2021 Chevrolet Silverado 3500 — STANDARD MOTOR PRODUCTS S2936.
Brake Pedal Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 6.6L V8 DIESEL Turbocharged | S2506 | 🇺🇸 US 🇨🇦 CA | Terminal Type: Blade | 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.
One part is listed for the 2021 Chevrolet Silverado 3500 — STANDARD MOTOR PRODUCTS S2506.
Camshaft Position Sensor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HOLSTEIN Fits: 6.6L V8 DIESEL Turbocharged | 2HAR0060 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| STANDARD MOTOR PRODUCTS Fits: 6.6L V8 DIESEL Turbocharged | S2316 | 🇺🇸 US 🇨🇦 CA | Connector Shape: OvalNumber of Splice Connectors Included: 3 | View on Amazon |
| UNITED MOTOR PRODUCTS Fits: 6.6L V8 DIESEL Turbocharged | CON62 | 🇺🇸 US 🇨🇦 CA | 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.
3 Camshaft Position Sensor Connector parts for the 2021 Chevrolet Silverado 3500 come from 3 brands — HOLSTEIN, STANDARD MOTOR PRODUCTS and UNITED MOTOR PRODUCTS.
This group includes HOLSTEIN 2HAR0060, STANDARD MOTOR PRODUCTS S2316 and UNITED MOTOR PRODUCTS CON62.
Chassis Wiring Harness / Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 6.6L V8 DIESEL Turbocharged | 85526683 | 🇺🇸 US 🇨🇦 CA | FrontLeft | View on Amazon |
| GM GENUINE Fits: 6.6L V8 DIESEL Turbocharged | 85533165 | 🇺🇸 US 🇨🇦 CA | Black | View on Amazon |
| GM GENUINE Fits: 6.6L V8 DIESEL Turbocharged | 84769203 | 🇺🇸 US 🇨🇦 CA | Gender: FemaleBlack | View on Amazon |
| GM GENUINE Fits: 6.6L V8 DIESEL Turbocharged | PT3922 | 🇺🇸 US 🇨🇦 CA | Si Elec Code: X436Rear Axle Harness to Chassis Harness | 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.
GM GENUINE supplies the 4 Chassis Wiring Harness / Connector parts for the 2021 Chevrolet Silverado 3500.
Listed part numbers: GM GENUINE 85526683, GM GENUINE 85533165 and GM GENUINE 84769203, plus the other parts above.
Crankshaft Position Sensor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HOLSTEIN Fits: 6.6L V8 DIESEL Turbocharged | 2HAR0060 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| STANDARD MOTOR PRODUCTS Fits: 6.6L V8 DIESEL Turbocharged | 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.
2 Crankshaft Position Sensor Connector parts for the 2021 Chevrolet Silverado 3500 come from 2 brands — HOLSTEIN and STANDARD MOTOR PRODUCTS.
Listed part numbers: HOLSTEIN 2HAR0060 and STANDARD MOTOR PRODUCTS S2316.
Diesel Exhaust Fluid (DEF) Pump Wiring Harness / Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO Fits: 6.6L V8 DIESEL Turbocharged | 84876221 | 🇺🇸 US 🇨🇦 CA | GM Original Equipment | View on Amazon |
| GM GENUINE Fits: 6.6L V8 DIESEL Turbocharged | 87821866 | 🇺🇸 US 🇨🇦 CA | Fits 98.2" Bed141.5" Wheelbase or 162.5" Wheelbase or 172.0" Wheelbase | View on Amazon |
| GM GENUINE Fits: 6.6L V8 DIESEL Turbocharged | 84894529 | 🇺🇸 US 🇨🇦 CA | 146.3" Wheelbase or 170.8" Wheelbase or 176.7" Wheelbase | View on Amazon |
| GM GENUINE Fits: 6.6L V8 DIESEL Turbocharged | 85138745 | 🇺🇸 US 🇨🇦 CA | Fits 98.2" Bed141.5" Wheelbase or 162.5" Wheelbase or 172.0" Wheelbase | View on Amazon |
This table covers the wiring-harness connectors at the Diesel Exhaust Fluid (DEF) Pump. 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.
4 Diesel Exhaust Fluid (DEF) Pump Wiring Harness / Connector parts are listed for the 2021 Chevrolet Silverado 3500, from GM GENUINE and ACDELCO.
This group includes ACDELCO 84876221, GM GENUINE 87821866 and GM GENUINE 84894529 and the remaining parts above.
Differential Pressure Sensor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: 6.6L V8 DIESEL Turbocharged | 645325 | 🇺🇸 US 🇨🇦 CA | Black | 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.
This group shows a single part: DORMAN 645325.
EGR Valve Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 6.6L V8 DIESEL Turbocharged | S2488 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the harness connectors at the EGR Valve. 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.
This group shows a single part: STANDARD MOTOR PRODUCTS S2488.
Engine Block Heater Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 6.6L V8 DIESEL Turbocharged | 84564686 | 🇺🇸 US 🇨🇦 CA | End 1 Terminal Gender: FemaleEnd 1 Terminal Type: Pin | 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.
This group shows a single part: GM GENUINE 84564686.
Exhaust Gas Temperature (EGT) Sensor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO Fits: 6.6L V8 DIESEL Turbocharged | 84727362 | 🇺🇸 US 🇨🇦 CA | GM Original Equipment | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: 6.6L V8 DIESEL Turbocharged | S2492 | 🇺🇸 US 🇨🇦 CA | Fits Rearor with Right Connector | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: 6.6L V8 DIESEL Turbocharged | S3154 | 🇺🇸 US 🇨🇦 CA | Center | 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.
3 Exhaust Gas Temperature (EGT) Sensor Connector parts for the 2021 Chevrolet Silverado 3500 come from 2 brands — STANDARD MOTOR PRODUCTS and ACDELCO.
This group includes ACDELCO 84727362, STANDARD MOTOR PRODUCTS S2492 and STANDARD MOTOR PRODUCTS S3154.
Fuel Injection Pressure Sensor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 6.6L V8 DIESEL Turbocharged | S1713 | 🇺🇸 US 🇨🇦 CA | 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.
This group shows a single part: STANDARD MOTOR PRODUCTS S1713.
Fuel Injector Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 6.6L V8 DIESEL Turbocharged | S3064 | 🇺🇸 US 🇨🇦 CA | 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.
This group shows a single part: STANDARD MOTOR PRODUCTS S3064.
Buying Electrical Connector Parts for a 2021 Chevrolet Silverado 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: Chassis Wiring Harness / Connector and Diesel Exhaust Fluid (DEF) Pump Wiring Harness / Connector .
Frequently Asked Questions
How many electrical connector parts fit the 2021 Chevrolet Silverado 3500?
Our catalog currently lists 25 electrical connector parts for the 2021 Chevrolet Silverado 3500 across 14 subcategories and 6 brands, covering both the 6.6L V8 and the 6.6L V8 DIESEL Turbocharged. Each part is matched to the engine(s) it fits.
Do electrical connector parts differ between 2021 Chevrolet Silverado 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 Silverado 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 Silverado 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 Silverado 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 Silverado 3500
Electrical Connector Parts for Other Chevrolet Silverado 3500 Years
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