Three problems related to engine knocking noise have been reported for the 2008 Chevrolet Impala. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2008 Chevrolet Impala based on all problems reported for the 2008 Impala.
Very bad knocking noise also electrical fire could've caught on fire.
Reduced engine power message, faulty back door locks, heating actuator repairs. This is a revised complaint to one I also made for just the reduced engine power message. After reading numerous complaints on here I have found that my car has several of the issues not just reduced engine power. I am most concerned with the car cutting out while driving due to the reduced engine power however we also have locks that don't open/lock with remote which has been going on for the last 3 years and since last winter heater only blows cold air until you accelerate the car. This month we had car repaired for a knocking noise coming from under glove box while car was running or shut off. Mechanic diagnosed as a new actuator and did repair. This however did not repair the blowing of cold air and also this is when the reduced engine power warning started. I am a former gmac employee and have had gm vehicles for the last 15 years. I am so disappointed that there are so many problems with this make/model and that gm has not issued a recall on these.
While driving 65mph vehicle just died. Was not able to start for about 15 mins. This has happened several times nearly causing several accidents. The vehicle intermittently has reduced engine power while driving and jerks from a complete stop sometimes. Now the oil engine pressure/turn off engine light and alarm go off all the time. Replace the sensor, but to no avail. The loud knocking sound from the dash is utterly annoying. I think the fact that only the police cars got recalled is insane, no matter what the recall was. I'm sure once they took those vehicles in; all the other issues I have mentioned were also fixed. Also the rear driver side power lock is faulty and unsafe when travelling with young children. I honestly believe with so many consumers having the exact same problems, gm should issue a recall on these vehicles before several tragedies occur and we then just become statistics. Please help. There are so many of us out here with the exact same issues on these Impalas who should not have to pay for the repair of something that apparently should be recalled by gm. Thank you for your attention to this matter.