trouble code "transmission module unstable" on 1998 GMC Sonoma

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

by in Pfafftown, NC on June 04, 2010
1 answer 1 comment
ANSWER by , June 04, 2010
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.
COMMENT by , June 04, 2010
The code checker I used only shows 1870, the book supplied with checker has "trans module unstable" as description. Thanks.