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Incorrect Pcm Programming

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2002 Saturn SL2, 2002 Saturn SL1, 2002 Saturn SL, 2002 Saturn SC2, and 2002 Saturn SC1. However, it is still accessible from the selected car via links, so may be relevant.
  1. There are only a few situations when reprogramming a PCM is appropriate, such as the following:
    • A new service PCM is installed.
    • A PCM from another vehicle is installed.
    • Revised software or calibration files have been released for this vehicle.
    2. NOTE: DO NOT re-program the PCM with the SAME software or calibration files that are already present in the PCM. This is not an effective repair for any type of driveability problem.
  2. Verify that the PCM contains the correct software or calibration. If incorrect programming is found, reprogram the PCM with the most current software or calibration. See POWERTRAIN CONTROL MODULE under PROGRAMMING in appropriate SELF-DIAGNOSTICS article.
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