Troubleshooting buick ignition module problems: Tips and Tricks

By / March 7, 2023

One user on GM forums described his experience with this frustrating issue:
> Hello,
> About a month ago, my 2005 Buick LaCrosse started having problems starting > and getting stuck in the ignition position. After many tries, I was able to > get it to start.
Unfortunately, while he was able to start his car, he soon encountered this issue again.
> Since then, it has been doing this every day. I can bring the car to > idling speed, but it won’t go any faster.
This issue is irritating, but fortunately, we have a few solutions that can help you fix this.

  • The buick ignition module problems, including issues with the ignition and starter, keep your car from starting.
  • Users reported this issue on various Buick models, but the article below has solutions for most of the models.
  • Fixing this issue on your car requires lots of patience and determination, so make sure you don’t give up.

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    Replace the Ignition module

    1. Remove the ignition module and clean it using a toothbrush and compressed air.
    2. If after cleaning, the problem persists, you should replace it.
      If after cleaning, the problem persists, you should replace it.
    3. Locate the ignition module and remove it.
    4. Replace it according to the vehicle’s manual.

    Update the PCM software

    1. The PCM software is responsible for ensuring that all systems within the vehicle’s engine are synchronized.
    2. Software updates must be installed for PCMs to remain synchronized.
      Software updates must be installed for PCMs to remain synchronized.
    3. Buick’s updated software can be downloaded on its website.

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  • 3. Reboot your computer for the changes to take effect

    • Recalibrate the PCM

    1. Recalibrate the PCM (Powertrain Control Module).
    2. The PCM is located in the left side of the engine.
    3. Recalibrate the PCM by switching the ECM (Engine Control Module) from position 1 to 2.
    4. Now switch the ECM to position 2 and back to position 1 in 3 seconds.
      Now switch the ECM to position 2 and back to position 1 in 3 seconds.
    5. The PCM will be recalibrated.

    Reset the PCM

    1. Press and hold the “I” button and turn the ignition switch to “Run”.
    2. When the dash lights up, release the “I” button.
      When the dash lights up, release the
    3. While the engine is running, press and release the “1” and “2” buttons repeatedly until the dash lights dim. The “1” and “2” buttons control the fuel and spark advance adjustment settings.
    4. After the engine starts, wait 15 seconds.
    5. Press the “I” button to turn off the engine.
    6. Wait 5 minutes.
    7. Turn on the ignition switch to “Run” and press the “I” button.
      Turn on the ignition switch to
    8. Press the “1” and “2” buttons simultaneously until the dash lights dim.
    9. Start the engine.
    10. Wait 15 seconds.
    11. Press the “I” button to turn off the engine.
    12. Wait 5 minutes.
    13. Press the “I” button to turn the engine on.
    14. Press and release the “1” button repeatedly until the dash lights dim.
      Press and release the
    15. Press the “I” button to turn off the engine.
    16. Wait 5 minutes.
    17. Press the “I” button to turn the engine on.
    18. Press and release the “2” button repeatedly until the dash lights dim.
      Press and release the
    19. Press the “I” button to turn off the engine.
    20. Wait 5 minutes.
    21. Press the “I” button to turn the engine on.
    22. Press and release the “1” and “2” buttons simultaneously.
      Press and release the
    23. Press the “I” button to turn off the engine.
    24. Wait 5 minutes.
    25. Turn on the ignition switch to “Run”.
    26. Press the “I” button to turn off the engine.
    27. Wait 5 minutes.
    28. Press the “I” button to turn the engine on.
    29. Press and release the “1” button repeatedly.
    30. Press the “I” button to turn off the engine.
    31. Wait 5 minutes.
    32. Press the “I” button to turn the engine on.
    33. Press and release the “2รข

    Turn the ignition module on

    1. The ignition module powers on the ignition system of the car. The modules are placed on the dashboard.
    2. Turn the ignition module off
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    Turn the PCM on

    1. Locate the PCM on your car.
      Locate the PCM on your car.
    2. Use a 12-volt DC test light to check the ground circuit.
    3. Check the Battery
      Verify that the battery cables are secure.
    4. Check for loose or corroded battery posts.
    5. Make sure the battery’s fluid level is correct.
    6. If the battery is old, replace it with a new one.
      If the battery is old, replace it with a new one.
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