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
3Original wording in English
CHEVROLET, GMC
Reported code forms C0306
This Preliminary Information communication provides information to the technician about vehicles that have a service 4 wheel drive message displayed in the driver's information center. Technician will find Diagnostic…
CHEVROLET, GMC
Reported code forms C0306
This Preliminary Information communication provides information to the technician about vehicles that have a service 4 wheel drive message displayed in the driver's information center. Technician will find Diagnostic…
CADILLAC, CHEVROLET, GMC
Reported code forms C0306
INTERMITTENT SERVICE 4WD LIGHT COMES ON WITH DIAGNOSTIC TROUBLE CODE (DTC) C0306 OR C0308 STORED IN TCCM. *TT
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.