I have a 2003 Chevy Tahoe that keeps giving a Engine power reduction code. I just came back from the Dealer after having the computer re-programmed. At which time it was showing the following codes.P0120, P0220, P0654, P0740, P0785, P1516, P1518, P1860, and U1026. Please help me figure this out.
Thursday, May 16th, 2013 AT 6:51 PM