02 Envoy Evap Emission Control problem

Engine light came on and the code stated P0440- Evaporative Emission Control System malfunction. It has something to do with the charcoal canister. How much and is it easy to change the canister on my own?
Thanks
Buzz:

Engine light came on and the code stated P0440- Evaporative Emission Control System malfunction. It has something to do with the charcoal canister. How much and is it easy to change the canister on my own?
Thanks
Buzz:
Stop!, this does not mean the cannister is bad it is a system malfunction, try tightening your gas cap first then addt'l diagnosis is required. This is not a dyer type repair until the problem is pinpointed, that may require a full scan and possible use of a smoke machine to find the leak/malfunction.

Stop!, this does not mean the cannister is bad it is a system malfunction, try tightening your gas cap first then addt'l diagnosis is required. This is not a dyer type repair until the problem is pinpointed, that may require a full scan and possible use of a smoke machine to find the leak/malfunction.

OK, this is weird. I'm having that problem too. Mechanic recommended buying a new gas cap and I did, and check engine light came back on....

OK, this is weird. I'm having that problem too. Mechanic recommended buying a new gas cap and I did, and check engine light came back on....
That is beacuse that was not the problem, further diagnosis is necessary a mentioned above.

If the gas cap doesn't fix it, further troubleshooting is needed. Could be the purge solenoid or an associated tubing leak. There is a very basic EVAP system schematic sticker under the hood. The vacuum source for the 4.2L evap system is right up front/top on the throttle body.

Joel