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What causes the P0455 code to appear in a GMC Yukon?
The P0455 code is a diagnostic trouble code that indicates a large evaporative emission (EVAP) system leak. This code may appear in a GMC Yukon due to the following reasons: a. Loose or damaged gas cap: If the gas cap is not tightened properly or has a damaged seal, it can cause a large leak in the EVAP system. b. Faulty vent or purge valve: A malfunctioning vent valve or purge valve can cause the EVAP system to fail in sealing the vapor properly. c. Cracked or damaged EVAP lines: Damaged or cracked EVAP lines or hoses can lead to leaks in the system. d. Leaking fuel tank or filler neck: Damage or corrosion in the fuel tank or filler neck can cause a large EVAP leak. e. Faulty EVAP canister: A damaged or leaking EVAP canister can cause the P0455 code to appear.
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