A Loose or worn gas cap may cause Check Engine Light to illuminate.Google+
Car Problem Reports
Chevrolet HHR Check Engine Light Due to Gas Cap Issue
Chevrolet HHR Problem
Average Mileage: 75,642 mi (13,100 mi - 180,000 mi)
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.
Visitor, 2006 Chevrolet HHR, 72,354 mi
check engine light comes on for a couple days then goes out for a couple days
Visitor, 2006 Chevrolet HHR, 80,000 mi
Replaced gas cap stayed off for 1 week then came back on.
Visitor, 2008 Chevrolet HHR, 81,880 mi
Gas cap gets loose and check engine light stays on
Visitor, 2007 Chevrolet HHR, 65,000 mi
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
Visitor, 2008 Chevrolet HHR, 48,650 mi
Same issue - replaced gas cap and all is still well at 52418
Visitor, 2006 Chevrolet HHR, 13,100 mi
engine light came on for gas cap loose
Visitor, 2007 Chevrolet HHR, 80,000 mi
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.
Visitor, 2011 Chevrolet HHR
Check engine light is on just looking for similar problems oil is good!