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i scanned the code tonite with my obd2 and it came up p0442, which i heard is related to the evap system. could it be my gas cap. car is modified with srt intake but its been on the car for 2 years with no codes ever. so i dont think its related to this. i recently filled up the tank last week and it didnt throww the code till 5 days later, checked the cap and its tight so i am thinking maybe a bad cap? please help thanks in advance.
 

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Discussion Starter #2
P0442 OBD Trouble Code
Technical DescriptionEvaporative Emission Control System Leak Detected (small leak)

What does that mean?This indicates a fuel vapor leak in the EVAP control system. It means a very small leak has been detected. In fact, the leak can be from a hole as small as 0.04" in diameter. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.

SymptomsYou likely won't notice any drivability problems.

CausesA code P0442 most likely means one or more of the following has happened:

A loose or improperly affixed gas cap
A non-conforming gas cap (i.e. not factory/original brand)
A small leak/hole in a fuel vapor hose/tube
Other small leak in EVAP system
Faulty vent o-ring seal
Possible SolutionsWith a P0442, the most common repair is to:

Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
Otherwise, replace the gas cap, or
Inspect the EVAP system for cuts/holes in tubes/hoses
GUESS I FOUND MY ANSWER, THANKS
 

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i've been getting this code too....just tightened the gas cap and cleared the codes....will see what happens...thank you
Sometimes it's easier to just replace the gas cap if there's any doubt in it's sealing ability. Check the EVAP lines and VSV near the stock airbox(towards motor side). Make sure none of those lines are coming off/deteriorating. There's a couple lines there, one goes from the bottom of the VSV valve and goes into the bottom of the airbox and one goes straight back to the canister.
 
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