GMC Terrain check engine light issue with code P0496 recurring after reset on GMC Terrain

Some GMC Terrain owners report experiencing recurring check engine light issues associated with the P0496 code, even after resetting the light. Common symptoms include an illuminated check engine light, decreased fuel efficiency, a strong odor of fuel, engine misfires or stalls, and rough idling. The potential causes of this code often relate to problems within the EVAP (evaporative emissions) system, particularly EVAP flow during a non-purge condition. Owners may find that faulty components, such as the vapor canister purge valve, could be responsible, and inspecting for leaks in the EVAP system is crucial. Additionally, verifying that any replacement parts were installed correctly is important. If these issues persist, it is advisable for owners to seek professional diagnosis and repair to prevent further complications with the vehicle's emissions system and overall performance.