Stepper motors control the guages, The manufacturer of these motors supplied GM with 10's of thousands of the bad motors. These motors were used in all makes and models of GM cars and trucks. If all the guages progressively failed I believe this is your problem. I have a 2004 chevy impala ss and had the same problem, in the beginning I could "rock the key" from acc to off and reset the speedo, I checked with the chevy dealership and the new cluster was too expensive to replace. I spoke to an engineer (my Uncle) at delfi electronics and he clued me in about the problem with the stepper motors. I found them on the internet for $6.00 a piece. Removed the insturment cluster from the car, removed the motors by de-soldering to pins from the circuit board. And soldered the new ones in. (Use a fork to remove the indicator arms from the motors) In total I had about 4 hours removing, replacing the motors, and reinstalling the cluster. I also installed new led lights in the cluster while I had the cluster out. 7 motors and lights new soldering gun $56.00 total to fit it.
Friday, September 7th, 2012 AT 1:53 PM