What does this code mean?
The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.
A code identifies a detected condition, not a part that must automatically be replaced.
Manufacturer communications
2Original wording in English
CHEVROLET, GMC
Reported code forms C15AC
This technical bulletin provides repair information to correct a customer concern of Service 4–Wheel Drive Message Illuminated in DIC with DTC C15AC Set.
CHEVROLET
Reported code forms C15AC
This technical bulletin provides repair information to correct a customer concern of Service 4–Wheel Drive Message Illuminated in DIC with DTC C15AC Set.
Check vehicle applicability
16A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Chevrolet | SILVERADO 2500 | 2023 |
| Chevrolet | SILVERADO 2500 | 2022 |
| Chevrolet | SILVERADO 2500 | 2021 |
| Chevrolet | SILVERADO 2500 | 2020 |
| Chevrolet | SILVERADO 3500 | 2023 |
| Chevrolet | SILVERADO 3500 | 2022 |
| Chevrolet | SILVERADO 3500 | 2021 |
| Chevrolet | SILVERADO 3500 | 2020 |
| GMC | SIERRA 2500 | 2023 |
| GMC | SIERRA 2500 | 2022 |
| GMC | SIERRA 2500 | 2021 |
| GMC | SIERRA 2500 | 2020 |
Before replacing a part
Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.