Two problems related to vehicle shudder have been reported for the 2009 Chevrolet Impala. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2009 Chevrolet Impala based on all problems reported for the 2009 Impala.
Lately, I have been having issues with the acceleration of my vehicle. Every so often, my engine light comes on and I get a "engine reduced" notification, and my vehicle slows down. Whenever I reach 40mph, my hp meter drops and my car starts shaking. There has even been a time when my car would completely shut off and display "ignition disabled". Each time this has happened, the vehicle was moving on a highway. I went to a shop to get the error codes and I will upload them.
While driving onto a highway when I reach 56 miles per hour my vehicle lost power and slow down the brakes locked and the electrical system went haywire. The locks started locking and unlocking while the vehicle was in motion. The lights started flickering on and off and the car started shaking rapidly and the brakes locked up. Once I started the vehicle back up and the ignition switch seemed to be stuck and the air bag light displayed on the dashboard. When I turn off the vehicle and try to remove the key the key will not come out so I have to put it into neutral and back into park a few times before it will release the key. Since this has occurred I hear a knocking sound in my glove box when the door is open and closed and sometime hours after ill hear the noise and the electric will flicker.