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Re: computer relearn procedure
What engine do you have?
Technically the PCM should be reset and adaptive shift information (Taps) cleared with a GM Tech II diagnostics scan tool. But you can try disconnecting the battery negative for a few hours or overnight. Some people claim the PCM module was put into re-learn mode. The latter part is free and of course the first part will probably cost since it has to be performed by a GM dealer.
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