2020-2025 GMC Sierra 2500 3500 HD SRW Rear Lamp Wiring Harness OEM
This is a Genuine GM OEM Rear Lamp Wiring Harness for the 2020–2025 GMC Sierra 2500 HD and Sierra 3500 HD. It is a direct replacement part designed to restore proper rear lamp electrical connectivity on single rear wheel configurations.
As a GM Genuine Part, this harness is designed, engineered, and tested to rigorous GM standards for lasting reliability. It fits either the Driver or Passenger Side. Durable outer coverings help shield and protect against tough conditions, vibration, abrasions, and moisture. Wires are color coded correctly for easy installation. This part is compatible with single rear wheel (SRW) configurations only — dual rear wheel (DRW) vehicles are excluded.
| Year Range | Make | Model | Trim/Engine | Notes/Options |
|---|---|---|---|---|
| 2020–2025 | GMC | Sierra 2500 HD | 6.6L V8 Gas (L8T); 6.6L V8 Diesel (LM2 Duramax) | Single Rear Wheels (SRW) only; fits Driver or Passenger Side |
| 2020–2025 | GMC | Sierra 3500 HD | 6.6L V8 Gas (L8T); 6.6L V8 Diesel (LM2 Duramax) | Single Rear Wheels (SRW) only; fits Driver or Passenger Side |
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