Reference meaning
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.
Narrow by vehicle
A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
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.
Scan worksheet →Manufacturer communications
3Original wording in English
CADILLAC, CHEVROLET, GMC
This Preliminary information communicates that when they connect a trailer to the truck that there is a Service Trailer Brake message displayed in the DIC. When checking for DTC's a C159C sym49 maybe set for the Trailer Brake Control Switch. GM Engineering released an updated trailer brake switch, See Customer Satisfaction Progr…
CADILLAC, CHEVROLET, GMC
This Preliminary information communicates that when they connect a trailer to the truck that there is a Service Trailer Brake message displayed in the DIC. When checking for DTC's a C159C sym49 maybe set for the Trailer Brake Control Switch. GM Engineering is aware of the issue and working on a fix.
CADILLAC, CHEVROLET, GMC
This Preliminary information communicates that when they connect a trailer to the truck that there is a Service Trailer Brake message displayed in the DIC. When checking for DTC's a C159C sym49 maybe set for the Trailer Brake Control Switch. GM Engineering is aware of the issue and working on a fix.
Check vehicle applicability
9A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Cadillac | ESCALADE ESV ↗ | 2022 |
| Chevrolet | SILVERADO 1500 ↗ | 2023 |
| Chevrolet | SILVERADO 1500 ↗ | 2022 |
| Chevrolet | SUBURBAN ↗ | 2022 |
| Chevrolet | TAHOE ↗ | 2023 |
| Chevrolet | TAHOE ↗ | 2022 |
| GMC | SIERRA 1500 ↗ | 2023 |
| GMC | SIERRA 1500 ↗ | 2022 |
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.