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
6Original wording in English
CADILLAC, CHEVROLET, GMC
Reported code forms C0021
This technical bulletin provides repair information to correct a customer concern of Loss of Brake Assist, Various Messages Displayed in Driver Information Center (DIC), Brake Pedal Travel and Apply May Feel Different,…
CHEVROLET, GMC
Reported code forms C0021
This Preliminary information communicates an issue with DTC P0606 and C0021 setting after completing campaign N192268090 and advises to reprogram the BSCM with updated calibrations available in Tis2Web.
CHEVROLET, GMC
Reported code forms C0021
This Preliminary information communicates an issue with DTC P0606 and C0021 setting after completing campaign N192268090 and advises to reprogram the BSCM with updated calibrations available in Tis2Web.
CHEVROLET, GMC
Reported code forms C0021
This Preliminary information communicates an issue with DTC P0606 and C0021 setting after completing campaign N192268090 and advises to reprogram the BSCM with updated calibrations available in Tis2Web.
CHEVROLET, GMC
Reported code forms C0021
This Preliminary information communicates an issue with DTC P0606 and C0021 setting after completing campaign N192268090 and it provides information about using and maintaining proper battery voltage while programming…
CHEVROLET, GMC
Reported code forms C0021
This Preliminary information communicates an issue with DTC P0606 and C0021 setting after completing campaign N192268090 and it provides information about using and maintaining proper battery voltage while programming…
Check vehicle applicability
1A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| GMC | SIERRA 1500 | 2019 |
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.