P0441 OBD2 Code in 2008 Pontiac Grand Prix After Evap Canister Replacement

Model: Pontiac Grand Prix Fault Code: P0441 Posted: 2014-12-17 17:35

I replaced the EVAP canister one month ago, but recently my 2008 Pontiac Grand Prix has started showing code P0441 along with a thermostat operating below temperature. The shop replaced the thermostat, but during a smoke test they reported not having the necessary fittings to connect to the fuel tank. As a result, no leaks were detected. Given that the same P0441 code reappears after the repair, how critical is it to perform another diagnostic or smoke test to confirm the issue? Is there a specific procedure for resolving this code in a 2008 Pontiac Grand Prix?