Electrical body builder manual for 2020 GMC Sierra 2500HD and 3500HD trucks, covering VIN, RPO codes, wiring, and component systems.
This manual provides electrical system information for body builders and technicians working on 2020 GMC Sierra 2500HD and 3500HD trucks. It includes details on VIN structure, RPO codes, vehicle certification, tire placards, anti-theft labels, and wiring schematics for systems like lighting, HVAC, brakes, and transmission. Sections cover component connectors, power distribution, and safety systems such as immobilizers and seat belts.
The document is organized by system, with detailed diagrams and specifications for electrical components, including harnesses, sensors, and control modules. It is intended for use during vehicle modification, repair, or customization, and includes reference tables for engine types, transmission IDs, and vehicle class types.
| Vehicle Identification Number (VIN) Format | 10-character VIN with position definitions including country, manufacturer, vehicle type, and model year. |
|---|---|
| Model Year | 2020 |
| Plant Location | Flint, Michigan, USA |
The VIN plate is located on the upper left corner of the instrument panel and can be seen through the windshield from the outside.
The RPO code list includes options such as interior trim, seat adjustments, wheel types, and safety features like immobilizers and rear cameras.
The Shift Lock Control prevents the vehicle from being shifted out of park unless the brake pedal is pressed and the ignition is on.