I know that this is a very old thread, but perhaps someone in the know will breeze back thru anyway. I am currently looking for a way to - temporarily - disable TCC lock up on a 2000 Olds Silhouette (4T65E).
Mine is basically dropping in and out. At higher speeds (70 mph hi-way) its mostly unnoticeable unless you watch the tach. At 45-60 or so it gives a pretty bad stammer.
I've had it to a shop but just my luck the real trans tech wasn't there the day I brought it in. Of course, no one mentioned this minor fact to me even though I was bringing it for a trans scan! I can't stand this logic that scanners can just handle it independently of expertise. I learned nothing on my first trip.
Anyway, I am going to get it back to a shop but its not easy for me to have a day when I can just leave it all day (every shop requires it) - its major family logistics & time engineering. I'm looking at about a week from now.
In the meantime the van is fine, including all gear/shifts other than the lock up problem, and it needs to be used for normal family stuff. There's the wife's 30 mi round trip to work (rural hi-way and suburb/city style roads) and the running around of kids to here and there.
I just cringe thinking about this happening and the additional damage. It might turn out to be a catastrophic problem - or I might turn it into one just by driving it.
Anyway, I thought that pulling the TCC switch wire from the brake switch (purple from PCM) would do it since it would break the circuit continuity - which is what the brake switch does - but I was apparently wrong about that since it didn't seem to make a bit of difference.
If whatever can be done triggers limp mode, then I'll just undo it.
It makes no sense to me that there is no easy way to just turn the dumb thing off. This thing was equipped with air shocks and trailer wiring for pete's sake. How about a nice little O/D off button?
If anyone comes through and can help I'd be much obliged.
