Check Engine Light Due to Gas Cap Issue on Buick Rainier

A Loose or worn gas cap may cause Check Engine Light to illuminate.

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Average mileage: 72,756 (15,000–120,000)
4 model years affected: 2004, 2005, 2006, 2007
22 people reported this problem
11 people shared problem details
2006 Buick Rainier15,000
Have had cap replaced at least three times since we purchased auto. Started around 15,000. Dealership closed and any recalls, we are told need to go to a GM dealer or not covered even if other shops were certified through GM
2004 Buick Rainier85,000
A Toy Story Sticker solved this one for me. I stuck it right over the indicator light!! THe darn thing comes on EVERY time that I am almost empty. As soon as I fill up, it may go off, it may not. Sometimes I only have to turn the car off, go outside and screw the cap on again. It's not a very smart car.
2005 Buick Rainier50,000
The light came on signalling a Gas Cap issue. I bought a new one at the dealership where I bought the car new, and we still have the problem.
2004 Buick Rainier100,000
Every year code p0455 comes out large leak on evaporation system change the cap one time work but now a message come out in the dash board saying loose cap
2007 Buick Rainier94,341
light comes on ck gas cap have bought three new gas caps from buick dealership and yet still have the same problem
2005 Buick Rainier36,000
My light comes on and I make sure the cap is secure and it is --I wonder why the light keeps coming on
Light just pop on checked gas cap don't are any problem with gas cap
2005 Buick Rainier120,000
Bought a new gas cap
2004 Buick Rainier38,000
removed gas cap and reinstalled. After a tank of gas the light went off. It has occurred twice with same result.
2004 Buick Rainier95,000
Check engine light comes on frequently due to gas cap :(
2004 Buick Rainier88,700
Gas cap no longer latches causing the check engine light to illuminate.
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