Question about 2002 Pontiac Grand Prix

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Changed thermostat because of check engine light,need to get car inspected monday.how do I reset computer to clear code.I was told to disconnect baterry for at least a min,fuel between 1/2 and 3/4 run car at 30 for a few minutes and then 50 for a few minutes.let car cool at least 20 degrees then repeat(except for battery part.is that correct

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  • fschill Oct 03, 2009

    did you mean fuse for ecm? thanks

  • fschill Oct 03, 2009

    Thanks!!!!lots of help

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You will need to disconnect the battery or pull the fuse for the pcm for more than a minute....At least 15 to 20 minutes. This should clear the code from the system. Otherwise it takes several times of driving for the pcm to clear the code itself. The pcm will self clear the code when the problem does not come back after several days of driving..but disconnecting the negative battery cable for 20 minutes should clear the code. Have your remote ready because the alarm may go off when the battery is re-connected and you will lose you radio station pre-sets and clock will need to be set.

Posted on Oct 03, 2009

  • muebe Oct 03, 2009

    Yes I did. It is sometimes called a ECM engine control module or PCM programmed control module. If you pull that fuse it should cut the computer's power and clear the codes in the memory. Then the check engine light should also go off.

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