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1998 GMC Sonoma Question: trouble code "transmission module unstable"



, 4.3L V6, Pfafftown, NC, June 04, 2010, 11:42

Trouble code "transmission module unstable". What are possible fixes? Where is transmission module?

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  • Answer #1

    June 04, 2010, 13:24

    The transmission on your 1998 GMC Sonoma is controlled by the PCM (Powertrain Control Module) The PCM combines the engine and transmission control modules. I have been a GM tech for over 25 years and I have never hear of a code description of "transmission module unstable" If you could send the code number Pxxxx that would be a big help.

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    , June 04, 2010, 17:54

    The code checker I used only shows 1870, the book supplied with checker has "trans module unstable" as description. Thanks.

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