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
4Original wording in English
CHEVROLET, GMC
Reported code forms C111B
This PI communicates an issue with a SES MIL with DTC P2535, P12A6, P10DA and/or C111B maybe set after replacing the fuel pump driver module. Engineering is working on a fix, but in the meantime, dealers are to install…
CHEVROLET, GMC
Reported code forms C111B
This PI communicates an issue with a SES MIL with DTC P2535, P12A6, P10DA and/or C111B maybe set after replacing the fuel pump driver module. Engineering is working on a fix, but in the meantime, dealers are to install…
CHEVROLET, GMC
Reported code forms C111B
This Preliminary Information communication provides information to the technician about vehicles that have Trailer connection not recognized or “Check Trailer wiring” or “Service Trailer Brake” message. Technician may…
CHEVROLET, GMC
Reported code forms C111B
This preliminary information communicates a Diagnostic Tip for a Service Trailer Brake Message with DTC C111B C1112 C1113 C1114 advising to address any battery issues first before any in depth diagnostics are done.
Check vehicle applicability
8A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| GMC | SIERRA 3500 | 2023 |
| GMC | SIERRA 3500 | 2022 |
| GMC | SIERRA 3500 | 2021 |
| GMC | SIERRA 3500 | 2020 |
| GMC | SIERRA 3500 | 2018 |
| GMC | SIERRA 3500 | 2017 |
| GMC | SIERRA 3500 | 2016 |
| GMC | SIERRA 3500 | 2015 |
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.