If your 1999 Pontiac Grand Prix 3.1L has PCM failure symptoms like no-start or check engine light, follow factory cautions to avoid damage. Learn replacement and programming.

Learn about 1998 Pontiac Grand Prix PCM/ECM failure symptoms, replacement labor times, and programming cautions to avoid theft deterrent issues and oil life defaults.

If your 1997 Pontiac Grand Prix shows no‑start or shifting issues, a faulty PCM may be the cause. Learn precautions and repair outcomes.

If your 1996 Pontiac Grand Prix shows PCM issues, beware of potential drivability loss; proper relearn steps can restore function and keep emissions in check.

If your 1994 Pontiac Grand Prix shows no‑start or erratic performance, remember to keep the ignition off when handling the PCM. Proper replacement restores engine control.

If your 1993 Pontiac Grand Prix shows no‑start or shifting issues, ensure the ignition is off when handling the PCM. Proper removal and VIN‑programmed replacement restores function.

1992 Pontiac Grand Prix PCM failure causes hard-start, stalling, and shifting problems. Always disconnect battery with ignition OFF to prevent module damage.

Symptoms of a failing ECM in a 1991 Pontiac Grand Prix 2.3L, location under the dash, and how a pre-programmed unit avoids the 0.5-hour relearn procedure.

If your 1990 Pontiac Grand Prix shows no‑start or erratic engine behavior, remember to keep the ignition off when handling the PCM to avoid damage and restore proper operation.