Check Engine Light Due to Gas Cap Issue on Chevrolet HHR

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

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Average mileage: 72,890 (13,100–180,000)
6 model years affected: 2006, 2007, 2008, 2009, more2010, 2011
27 people reported this problem
14 people shared problem details
2006 Chevrolet HHR72,354
check engine light comes on for a couple days then goes out for a couple days
i have change out the camshaft sensor and still my engine like still come on, where is the crankshaft sensor located on my engine....please help me....i check my gas cap and make sure it is on tight.
2006 Chevrolet HHR80,000
Replaced gas cap stayed off for 1 week then came back on.
2007 Chevrolet HHR80,000
This seems to be a common problem with HHRs. I've replaced gas caps, taken it to the dealer and nobody can find any issues. They reset the codes and it will stay off for awhile and then come back on. I've just learned to live with it.
2008 Chevrolet HHR81,880
Gas cap gets loose and check engine light stays on
2007 Chevrolet HHR65,000
Engine light came on - checked gasoline tank cap - blew it off to clean - replaced it and light went off - has periodically come on again and then goes off again - some brands of gasoline also seem to cause it to come on -
I have a engine on and they are taking about a new engine
2008 Chevrolet HHR48,650
Same issue - replaced gas cap and all is still well at 52418
The gas cap has been replaced three times. A smoke test was done originally to diagnose the problem. It appears that the gas caps don't 'really' fit this vehicle. So, I wouldn't really care, but the auto-start cannot work without that damn engine light off, so the one thing that worked on this pos, now can't work. We will NEVER buy another GM product.
2006 Chevrolet HHR13,100
engine light came on for gas cap loose
Check engine light is on just looking for similar problems oil is good!
Twice this problem happened to me. Replaced the gas cap and it worked for a few years. Now its doing it again.
2009 Chevrolet HHR48,500
2009 HHR. At 48500 miles, the check engine light is on. I changed the spark plugs and coil caps. Light stayed out for few hundred miles but now back on.
2007 Chevrolet HHR49,000
Check engine light comes on replaced gas cap went out for quit awhile but now it is one again. Dealership said there is a bulletin out. Car runs fine and there is no performance loss. One dealership wants to clean injectors for $240 but i really don't think thats the problem Any Ideas???? Karl
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