how to fix OBDII code po440?
12-21-2006, 01:32 PM
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how to fix OBDII code po440? I have an SES light on my dash and scanner revealed it was code PO440 "Evap Emissions Device." Anyone know how to fix this? I cleared the code for now but know it will come back up. Thanks for the help!
12-21-2006, 01:45 PM
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lol, damn! Imagine the poor guy who pays a gm dealer $100 bucks to fix a loose gas cap!!!
12-21-2006, 10:24 PM
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Also, make sure you're not filling the car up while it's running! That can sometimes cause a P0440. Like 2001NBMZ28 said, check the gas cap (basically the seal around the fill tube) if that does not fix it, you will have to have it hooked up to a smoke machine to find the leak. I just had to replace the Vent Valve on an '02 this week because it was stuck open. It's located on top of the gas tank along with the charcoal canister.
