error 631

RE: error 631

"Overdrive transmission cancel indicator light fault"

Does the O/D switch and light work?
 
RE: error 631

You need to check the O/D button and harness. It sounds like it is shorted. It is a momentary contact switch to ground. If the O/D button does not work due to a harness break, I do not think you will get a code.

Do a search of the forum and I belive you will find instructions. Basically, you'll need to pull the EATC trim, remove some screws, remove the shifter trim and console to access the harness. I had to replace my button switch which does not require removal of the shifter knob, but if the harness needs replaced, you need to carefully remove the shift knob also.
 
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