One problem related to engine noise has been reported for the 2009 Chevrolet Malibu. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2009 Chevrolet Malibu based on all problems reported for the 2009 Malibu.
While driving the car at any speed the vehicle will accelerate on its own and the rpm will increase to 4 or higher as if I am smashing the gas. During this time of the rmp fluctuation you can hear the engine sound louder and feel the acceleration almost like a jolt. At night when driving the car you can see the brake light illuminate without ever touching the brakes. I've taken the car to the dealership several times regarding this matter they claim it has been fixed, however I'm still having the same problem. When it is warm/hot outside, when using the keyless remote to lock/unlock the car all locks will stick. The only way I can get into the vehicle is to use the key to open the doors and if I have groceries in the back seat I will have to crawl from the front to the back to open the doors.