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
14Original wording in English
BUICK, CADILLAC, CHEVROLET
Reported code forms P0021
N192266190 02 - Service Update - (Revised Service Procedure for XT5). Certain vehicles may have an engine control software issue that can occur during an automatic stop/start event. Immediately following an auto-start…
BUICK, CADILLAC, CHEVROLET
Reported code forms P0021
N192266190 01 - Service Update. Certain 2018 model year Buick LaCrosse, Enclave, Cadillac XT5 and Chevrolet Traverse vehicles may have an engine control software issue that can occur during an automatic stop/start…
BUICK, CADILLAC, CHEVROLET
Reported code forms P0021
N192266190 - Service Update. Certain vehicles may have an engine control software issue that can occur during a stop/start event that is causing drivability concerns such as the engine running roughly. Potential reduced…
BUICK, CADILLAC, CHEVROLET
Reported code forms P0021
This Preliminary information communicates there is an investigation into cause and correction for this group of DTC's setting together. (P0011, P0014, P0021, P0024). Revised to include the possibility of setting in…
BUICK, CADILLAC, CHEVROLET
Reported code forms P0021
This Preliminary information communicates there is an investigation into cause and correction for this group of DTC's setting together. (P0011, P0014, P0021, P0024). Revised to include the possibility of setting in…
BUICK, CADILLAC, CHEVROLET
Reported code forms P0021
This Preliminary information communicates there is an investigation into cause and correction for this group of DTC's setting together. (P0011, P0014, P0021, P0024).
Check vehicle applicability
8A 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.
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.