At low speed on breaking, the automatic transmission is recently slamming into a low gear and instantly settling back into a normal drive mode. After this happens, the transmission warning light alights along with the ACM light. The lights reset when the car is restarted. After this happens, upon normal highway driving at constant speed, I notice that there is a minor grabbing type feel of the transmission that seems to cycle on and off.
A review of previous transmission questions appears to indicate that there could is a bad chip in the Transmission Control Module.
1. Does this sound reasonable?
2. Where is the TCM?
3. Can the chip just be replaced, or does the entire TCM need to be replaced?
4. Upon replacement of the TCM or chip, does it need programming or can I just get up and go?
Wednesday, June 16th, 2010 AT 9:48 PM
