Chrysler Pacifica gas cap warning and P0455 code issue with emissions concerns on Chrysler Pacifica

Some Chrysler Pacifica owners report experiencing issues related to the gas cap warning and the P0455 code, which indicates a large evaporative emissions leak. While this code typically does not impact the vehicle's drivability, some owners may notice a fuel smell. Common causes of the P0455 code include a loose gas cap, damaged EVAP system hoses, and a faulty charcoal canister. To address the issue, owners are advised to first check the gas cap for tightness and condition, replacing it if necessary. Additionally, inspecting the EVAP system hoses for any cracks or leaks is crucial, as damaged hoses will need replacement. Testing the EVAP purge valve for proper operation is also recommended, with replacement required if it is found to be faulty. In many cases, simply tightening the gas cap and clearing the code can resolve the issue, and disconnecting the battery for about 30 minutes may also help.