This car has less than 60k original miles. Engine size is 3.8. Recently, the trans in this car will sometimes fall out of gear at low speed (driving thru a parking lot) and will sometimes downshift into low gear at highway speed. The PCM will not communicate with a scan tool (tried 3 different very expensive scan tools). I'm told that this often is the case with Mercury Sable and Ford Taurus automobiles of this vintage. With no diagnostic info to go on, I pulled the trans and disassembled. All internal components were found to be in pristine condition. We did replace an aluminum piston (noted no problem with it however) that sometimes gives trouble with a steel piston. After installing the trans and driving about 100 miles, am having the same problems. Just looking for thoughts on what might be the problem. Could a faulty PCM be the root of all this trouble? Anything else? I'm at the point of junking what is otherwise a very nice car.
on some of those cars, the computer controls the shifting.it might not be coming up on your check engine light, but you could have auto zone to check it out for you.
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