Check Engine Light Due to Gas Cap Issue on Pontiac Bonneville

Illumination of the Check Engine Light can be caused by a loose or worn gas cap.

RepairPal Verified
Average mileage: 129,508 (112,372–189,000)
10 model years affected: 1996, 1997, 1998, 1999, more2000, 2001, 2002, 2003, 2004, 2005
22 people reported this problem
4 people shared problem details
When I put my gas cap on, I have to turn it past being on. I turn it until it clicks several times. Otherwise, my service engine light comes on.
my check engine light has came on and there is nothing wrong with it
For as long as I can remember the check engine light is on. Replaced the gas cap. Works for about a week. Light back on. I gave up
And I have a brand new gas cap from auto zone for my make and model and it's still happening, cleared the computer n all.
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