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
2Original wording in English
CHEVROLET
Reported code forms B0408
HVAC Stuck in Defrost Mode, DTCs B0248, B0268 or B0408 Set Condition/Concern Some customers may comment that the HVAC system is stuck in the defrost mode. When checking the vehicle for DTCs, the HVAC control module may…
CHEVROLET, GMC, OLDSMOBILE
Reported code forms B0408
FALSE HVAC HISTORY DTC B0408 AND/OR HEATER & A/C TEMPERATURE CONTROL DOOR MOTOR BECOMES INOPERATIVE WHILE USING SCAN TOOL. *YC
Check vehicle applicability
6A 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.