The purge valve is part of the EVAP system. p0441 is usually set when the ECM can not monitor the purge valve performance. the EVAP system takes the gas fumes out of the tank and purges them into your intake system while you drive the car. if the ECM doesn't see a drop in fuel tank pressure then it sets the code. most common failure is the purge valve malfunctions or loss of power or ground signal to the purge valve.
Trouble Code: P0442
Most likely the gas cap.Hope this helps. Randy
EVAP Control System Small Leak Detected
Possible Causes:
Canister Purge valve is damaged, leaking or it has failed
Charcoal canister is loaded with fuel or moisture
Fuel filler cap loose, cross-threaded, incorrect part or damaged
Fuel tank is cracked (leaking), or a leak exists in the 'O' ring
Fuel tank pressure sensor is damaged or has failed
Fuel vapor line(s), fuel pipes or hoses damaged or leaking
PCM has failed
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