My wife drives a 99 ford expedition, 5.4, auto, 4x4, Sunday I am driving it and it wont upshift from 1st to 2nd unless I let off the gas or let it run up to 4000rpm. I have sel and blinking od off light. I pulled the code and got a p0755 shift solenoid b. That is really the only symptom, the other shifts seem fine.

1st question, which transmission do I have? I believe it to be the 4r100, the pan has a "notch" in it. Looks like this... Fel-Pro TOS18714 - Automatic Transmission Gasket | O'Reilly Auto Parts

2nd question, if it is the 4r100 is there just a solenoid "pack" and not individual solenoids to replace? I found these...PowerTorque® TE140 - Solenoid | O'Reilly Auto Parts

PowerTorque® TE141 - Solenoid | O'Reilly Auto Parts

3rd question, what is the difference between the pwm and non pwm?

I am mechanically inclined, actually worked as a marine technician for many years, but I am having a hell of a time figuring out what I got and what is inside it. Bought a chiltons manual just hoping for some pics and info and it isn't good for anything but kindling. So if you guys can give me a little advise that would be great.

 

Read the TR code on the door sticker.

E=4R100
U=AOD

 

E=4R100
U=4R70W

Before blindly replacing the solenoids it is a good idea to do some diagnostics to see if they are bad or not. There is no code that always means replace the solenoid. This code means there is an electrical open or short in the circuit for shift solenoid B. It could be a bad solenoid or it could be a broken wire between the PCM and the solenoid.

 

Thank you.


Ya, I planned on it, just haven't gotten that far. Any troubleshooting guides or ohms values for the solenoids anywhere?

 

Alright it's the 4r100, time to do some more searching.