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Incorrect PCM Programming

NOTE: DO NOT re-program the PCM with the SAME software/calibration files that are already present in the PCM. This is not an effective repair for any type of driveability condition.
  1. There are only a few situations where reprogramming a PCM is appropriate:
    • A new service PCM is installed.
    • A PCM from another vehicle is installed.
    • Revised software/calibration files have been released for this vehicle.

Verify that the PCM contains the correct software/calibration. If incorrect programming is found, reprogram the PCM with the most current software/calibration. Go to POWERTRAIN CONTROL MODULE under PROGRAMMING in SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - 3.4L ALERO, GRAND AM, IMPALA & MONTE CARLO article.

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