One problem related to engine noise has been reported for the 2011 Chevrolet HHR. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2011 Chevrolet HHR based on all problems reported for the 2011 HHR.
2011 Chevrolet Hhr. Consumer writes in regards to vehicle acceleration issues. The consumer stated while driving, she noticed the vehicle exhibit a boost/jerk type movement, and it made a strange noise. When she took the vehicle to the dealer, she was informed the problem was a spark plug and they fixed it. However, one night while driving, the vehicle once again exhibited the same boost/jerk movement, as if she suddenly hit the brake, as the vehicle was losing speed, until it shut down completely. She was able to pull over, turn the vehicle off, and re-started it again with no problem. A month later, the same thing happened, only that time, the electronic stability control light started blinking, followed by a strange noise. The electronic stability control light illuminated again in may 2014.