SOURCE: Where can I find diagnostic socket in chevrolet HHR 2008
should be under steering wheel within 19 inches left or right it may have a cover on it that says obd2
SOURCE: 2006 Chevrolet HHR LT Problem
After searching around, I found several posts that suggested reseating all the relays and fuses under the hood. After checking, I noticed nearly all of them were not seated well. I pushed them all down and I haven't had the problem since.
Ken
SOURCE: how do I change the headlight bulb in a 2008
Access to change the headlamp bulbs is through the wheel well. The recommended method is to remove the front tire and then the plastic inner fender liner. Once removed, you'll have easy (more or less) access to the rear of the headlamp housing.
SOURCE: How to Turn off Service Traction Control and ESC messages
I had this problem with my 2007 HHR. I drove away with the service engine and the service traction light on. The car was stuttering through the gears. I took it back and they checked it. They disconnect some wires while they change the oil and one was loose. The service engine turned off but the service traction stayed on. We disconnected the battery for 3 minutes and it fixed the problem. Some of those other guys spent up to 300 dollars to fix the problem. Hope it works out for you.
SOURCE: 2008 chevrolet HHR radio unlock code
There isnt a code that you can use to unlock the theftlock device in GM stereo units. You must take the vehicle to a GM service department and they will have to unlock it for you using a scan tool.
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