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2010 Chevrolet Equinox LT2 - 4 Cylinder - AWD.

I had the check engine light come on and OnStar stated it was my gas cap, so I was to make sure it was on tight (which in NJ, you cannot fill your own gas, but I have made sure that I hear the click when they close the cap) and drive around for a bit. The light never went off. I brought it to the dealer and they reset the light and said that it was the gas cap.

About 1 week later, the light goes on again. OnStar states again that it's the gas cap issue, even though I had not filled the car with gas recently. Brought it back to the dealer and they reset the light and said if it came on again, they would need to do a smoke test to check if there is any small leaks in the vacuum system.

Sure enough, 1 week later, the check engine light came again for the third time. I left the car with them and they could not find any leaks after the smoke test and said I need to make sure the gas cap on tight (which I started to tighten myself frequently between fill-ups). They replaced a sensor (which was done overnight, which makes me question how they got a sensor so fast for a brand new model) which they thought may be triggering the check engine light.

Less than 1 week later, the check engine light came on for the fourth time. I told them this time I felt the car hesitate and almost stalled in the middle of a highway. This time, the dealer called Chevrolet. It turns out that there were several check engine "codes"...the gas cap one is a "general" code that could come on when the engine misfires. Sure enough, the other 2 codes were misfiring of the engine (major and minor) due to a short in one of the ignition coils. That part was replaced. Also, there was a TINY vacuum leak which went undetected during the smoke test. This does make sense, as the car hesitated a previous time, but didn't think that was an issue.

I'm not sure why OnStar can't give you all the check engine codes that come up. It was great that this was covered under the warranty as I was provided with a rental car while the car was in service. However, I am a loyal GM/Chevrolet customer, and to have problems with a car with about 10,000 miles on it is very disappointing. I hope that this is not the way the rest of my ownership of the car is to be.

My gas mileage really is even more disappointing. I barely get above 22 MPG, all highway, driving very conservatively. I guess to come near the 20 City / 29 Highway, you need to be coasting down a mountain for several hours.
 

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gas cap is usually the default fix for most evap system codes....and just because its tight doesnt mean its functioning properly.....
 

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Discussion Starter #3
Thanks -- you bring up a good point. I don't even know if they tested the actual gas cap. Wouldn't hurt for me to just get it replaced to be sure.
 

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I know that Onstar can get the generic codes, in the past they asked me if they can conctact the dealership to make an appointment. Impressive.
Nah, don't worry, all new cars are extremely complicated and with thousands of parts some sensors or little pieces can fail. No different than anything else on the market. Be happy this was under warranty! Those pesky things will not fail again. In my experience ALL cars have issues and I've had imports and domestic.
 

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I have this same issue with my '07 and it is indeed my gas cap. In fact, I just filled up today and the thing WON'T go on! I turn and turn and it clicks repeatedly, but pull on it and it comes right out. I picked up a replacement one a while ago and it's a nice tight fit, but the darn light still comes on (they looked up the gas cap for my car so it should be right).
 

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I never had any issues with onstar not giving me the codes. But you do have to ask for them, did you ask them for the codes?
 
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