Several months ago I started having trouble with the transmission acting like it was in neutral. It happened at random times of the day, different weather, different gears, different operating temps, different ambient temps, etc... It might not shift 1-2, or I might be in 3rd or 4th with TC
locked and suddenly, nothing. Sometimes if I backed out of the pedal and then back in it was fine, other times, not.
I couldn't figure it out. There were no codes, no CEL
, and no TCIL. Nothing to indicate that something was wrong.
The only way I could get home one evening was pull it down into manual 2 and lock the TC
Then it quit doing it. Just suddenly while I was testing stuff, it quit acting up. It was perfect for several weeks.
I drove all the way to Florida (~1100 mile trip one way) without any problems at all.
Then on the way back, it did it. I was on the interstate doing between 70 and 80 mph with the cruise set, and suddenly, the cruise kicked off and the engine went to idle. I stepped back on the pedal, and it took right back off, so I didn't give it a second thought. But it did it again, but that time I happened to be driving manually, so the RPMS went way up.
Never in all this time did the lever ever so much as flinch, much less get bumped into neutral.
So I drove home with it occassionally dropping into neutral.
It seemed to be more prone to doing this when the weather was wet.
I talked with Brian (BTS) about it, and he reccomended to change the filter and put in 8qts (4r100
pan) of fluid. I did, but a week later it did it again.
So I called him back, and he asked me a few more questions, and suggested that I try replacing the transmission range position sensor (sometimes known as MLPS).
Apparently, the E4OD
uses a set of resistors in the sensor that create the appropriate voltage for the gear selected. But, the 4r100
uses a different system that is more reliable. For some reason he thought mine was a 4R100
, so he hadn't thought of it when I first called.
The F5TZ-7A247-B is what I got from the local dealership, about $100.
It's been two weeks now, and it hasn't given a hint of trouble.