Three problems related to power train have been reported for the 2002 GMC Sierra. The most recently reported issues are listed below.
The engine is no good, they say that the knocking at ticking is ok, gm has put out a notice indicating that this is within acceptable limits. If you heard my truck run you would think it was about to fail!.
Problem with gears/transmission since purchased.
Problems with 2002 GMC Sierra truck hesitating. The consumer requested that gms assist in getting the problem resolved before it causes a major safety hazard.