Unknown Check Engine light Question.

I have a check engine light thats been on for a few weeks. I took my car to get a diagnostic and the code is the same one you get when your gas cap is not on tight. I make sure the cap is on tight and I even bought new one from the dealer. 3 weeks later... the check engine light is still on and its still giving the same code. It not the gas cap, what else could this be?

Thanks

I'm in the same boat with my '03 Impala. I did however get the problem figured out......It's the fuel tank purge solinoid stuck open. My question is, does anyone here know where on the car this solenoid is? The local dealers won't give this information out. Thanks.

It's an EVAP code which means something in the EVAP system is leaking. Could be a solenoid stuck open or soemthing like that like the guy above, loose gas cap, cracked or leaking charcoal canister, etc.

I don't know how to check any of this stuff at home but at dealerships we use a smoke machine that produces smoke and then we check for leaks.

Found the solenoid/valve. It's up on the intake manifold. $22.00 at the GM parts counter, installed part last night and reset the MIL. Now we'll see if it comes back on.

I have a 2003 implala, and the service engine light is on.
can this be reset, by the radio?

I dont think you can reset the check engine light with the radio. You can reset the oil life monitor. Take it to autozone they should be able to reset it for you. They do that around here any way. JHH

Hope it stays out for you. But I would have bet that it was the vent valve that was sticking. JHH