If these vapors are leaking from the system, you’ll often smell them faintly while operating the vehicle. The EVAP system deals directly with fuel vapors. Often, this code is easily remedied by a new gas cap. The area around the fuel tank may smell of gas. The P0440 code will typically not be accompanied by any noticeable symptoms other than the smell of gas and the service engine soon light. If that’s the case for your Grand Cherokee, you may want to start your diagnosis with one of the other codes. It is common for another code from the P044X series to accompany the P0440 code, which can help provide further information on the issue. This code is a general indication of a malfunction in the EVAP system and does not pinpoint the specific problem. When the Grand Cherokee’s onboard diagnostics system (OBD-II) detects a fault in the EVAP system via a vacuum test, it generates the P0440 code. The EVAP system should not affect the way your Grand Cherokee’s engine runs whatsoever. The EVAP system is designed to capture, store, and recycle fuel vapors from the fuel tank and delivery system, preventing them from being released into the atmosphere.Įssential components of the system include fuel vapor hoses, a charcoal canister for fuel vapor storage, and computer-controlled purge and vent valves. EVAP System A loose or bad gas cap is the first thing you should check if your Grand Cherokee has P0440 P0440 is a generic code, which means it has the same definition for the Jeep Grand Cherokee as it would any other vehicle made after the 1996 model year. Evaporative Emission Control System – Malfunction
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