The EVAP system captures all fuel vapor from your vehicle’s fuel tank and sends them to the engine’s intake to be ignited in the normal combustion process. P0442: Evaporative Emission Control System → Leak Detected (Small) Evaporative Emission Control System P0442 is a universal OBD II diagnostic trouble code, applicable across vehicle manufacturers. The most common cause of P0442 is a missing or damaged fuel cap. While it’s unlikely to cause a breakdown, it can be bothersome and may result in a failed emissions test for your Grand Cherokee. This code appears when connecting the vehicle to an OBDII scanner and pertains to the emissions system.
One of the most common issues that happens with the Jeep Grand Cherokee is the P0442 trouble code.
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