Car Problem Reports

Saturn Ion Check Engine Light Due to Gas Cap Issue

Saturn Ion Problem
21 Reports
Me Too

Model Years Affected: 2003, 2004, 2005, 2006, 2007

Average Mileage: 79,933 mi (34,000 mi - 147,000 mi)


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

  • Visitor, , 90,000 mi

    Check engine light was on. Got a new gas cap and light went off. Was told it was a vapor leak and could cost $400 to figure out the problem. Thankfully we decided to try the gas cap first. It worked!!

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  • Visitor,

    My 2006 Saturn ION was showing an check engine light and when I took it to a Saturn dealership they were going to charge me $98 to hook it up and tell me what was wrong. Luckily, I had a friend who had the machine to do this and was able to tell me that it was the gas cap. About a week later the light came on again and since I had problems with the dealership and my oil change I had them check on the light for me and they also diagnosed it as the gas cap. This is twice in two weeks that this light has shown up. I hope this is the last time but I guess we'll have to wait and see.

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  • Visitor, , 59,700 mi

    check engine light came on last son - in -law pumped gas last and I always click my gas cap several times because I have had this problem before with another automobile....I am glad I read this article here today. I am praying this is all it is. Due mostly to the fact I just found out I need hearing aides and certainly cannot afford any car repairs at this time. Wish me luck I am trying the cap tonight:)

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  • Visitor, , 100,000 mi

    have changed the gas cap three times. disconnected battery to reset engine light, worked for a week now it's back on and gas cap light comes on.

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  • Visitor, , 51,000 mi

    the light comes on in the mornings have to play with gas cap

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  • kacha, , 34,000 mi

    Yeah I have this problem also.

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  • Visitor, , 65,000 mi

    At first I thought maybe someone was siphoning off my gas. Because about weekly, the light would be on, and I would check and the gas cap would be popped off.

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  • Visitor, , 59,500 mi

    If the gas cap is not screwed on tight, the engine light comes on.

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  • Visitor,

    Switched to a locking gas cap. Worked OK first few fillups. Once I left it loose and the light came on, it would not reset (several fillups, starts & stops) even after sc=ecuring it. Returned to old cap, light was out before the end of the next trip.

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