trouble code "transmission module unstable" on 1998 GMC Sonoma

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

Asked by for the 1998 GMC Sonoma
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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.
The code checker I used only shows 1870, the book supplied with checker has "trans module unstable" as description. Thanks.