One problem related to software has been reported for the 2006 Chevrolet HHR. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 Chevrolet HHR based on all problems reported for the 2006 HHR.
I have had several issues with my Hhr since purchased in September 2005. First incident was the lock on the hatch broke after only owning the car for a few months. Next was with the brakes. At first I noticed a noise when I applied my brakes it sounded like something was loose. This nose would come and go. After a few months I started to notice a slight vibration in my steering wheel when braking a few days later that vibration turned to violent shaking and resistance when braking. I took it to the dealer who informed me the rotors were warped and needed to be repaired. This was roughly around 13000 mi. The dealer did repair the rotors under warranty and didn't give me the "it's normal wear & tear" mumbo. Next is the check engine light keeps coming on. It will stay on for a few days and then go off. This has happened 3 times already and the dealer has replaced the sensor each time. Now we are up to the 4th time as it came back on again yesterday. I have also had issues with the radio. The radio has had power to it and no volume. This happened 3-4 times b/4 I took it to the dealer who had to reset & reprogram something on the radio.