Illumination of the Check Engine Light can be caused by a loose or worn gas cap.
Problems for specific Pontiac Grand Prix years:
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Repairpal verified 2005 Pontiac Grand Prix problems
The transmission pressure control solenoid may fail causing erratic shifting. Our technicians tell us that partial dis-assembly of the transmission is necessary to replace a failed pressure control solenoid.
The steering may develop a clunk type noise from the upper intermediate steering shaft. Our technicians tell us that you should check with your local GM dealer to find out what the latest repair is for this condition.