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1998 GMC Sonoma Question: Trouble code "transmission module unstable".

 

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jsirwin67, Pfafftown, NC, June 09, 2010, 10:17
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code checker used shows a code "1870" trans module unstable, have cleared it several times, comes on after 40-75 miles. What are possible fixes? Where is transmission module?

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  • Answer #1

    mastertech6371 June 09, 2010, 10:24
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     Master

    stop clearing the code and take it to a shop so they can see the freeze frame data to help them determine the problem. unless you have a scan too that can acess the info for the trans, throwing parts at it can be very expensive.

    Roy

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