2005 Grand Prix Check Engine Light

Guest

2005 Grand Prix Check Engine Light

Unread post by Guest » Fri Dec 04, 2009 2:50 pm

I have a 2005 Grand prix gt. The check engine light had come on and the on board computer screen said "check gas cap" So I replaced the gas cap with a locking one. The light and message went away. Then it came back on with the same message a couple days ago after. The car runs good, maybe burning a bit more gas. What could be the problem any ideas?

TechMW

Re: 2005 Grand Prix Check Engine Light

Unread post by TechMW » Sun Dec 13, 2009 12:35 pm

That warning about the gas cap can also be caused by a large leak in the Evap emission system. A large leak can be interpreted as aloose gas cap.
There is no sensor for the cap or anyhting lke that.
Need to have the system scanned for codes. will probably get a code P0455.

Meccboy

Re: 205 Grand Prix Check Engine Light

Unread post by Meccboy » Wed Feb 17, 2010 8:49 pm

Large EVAP leak usually caused by a faulty Vent Solenoid in the drivers side rear wheel house.

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