canister vent or purge valve malfuction vacuum leak or sticking vlave
Trouble code P0440 means:Evaporative emission control system malfunction
Trouble code P440 on a 2003 Dodge Ram indicates a problem with the evaporative emissions control system. To fix it, first inspect the gas cap for damage or ensure it's properly tightened. Next, check for any leaks or blockages in the EVAP system components, such as hoses and the charcoal canister. If necessary, replace any faulty parts and use an OBD-II scanner to clear the code and verify the issue is resolved.
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