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P1621 GMC - code and a rattle in transmission when in park but shifts good. wha does this mean

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P1621 GMC - code and a rattle in transmission when in park but not in drive, shifts good. what does this mean

Vehicle: 2001 gmc sonoma sls 2.2

1 Answer

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Hi there,

The code is not relevant to the transmission issue. The code is for reprogramming the PCM. An attempt must be made to reprogram it, if there isn't any success then the PCM must be replaced.

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