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2003 Buick Rendezvous code P0449
Ihave replaced the purge vent solenoid and the vent valve it self. The solenoid being in the engine compartment and the canister vent valve being located on the driver side of the fuel tank. Is there some thing else I am missing to get this code to reset. I have reset the codes by removeing the negative battery cable and the code comes back a couple of starts later. Please I am at whits end with this problem. Is the a certain resistance I can check? Or is there something else that this code can be ? I would guess if it was the PCM I would have numerous other codes as well. PLEASE SOMEONE HELP