Ford Super Duty (1999-2016) :: 4r100 - O/D Light Blinking - No Or Low Power
Truck : 2000 F250 XLT A/T 6.8L v10 4x4
Issue : O/D off light is flashing on the shift lever. In a drive gear (R, OD, D2, D1) there is very low power when giving it gas, more so from a stop. In P and N, I can rev the motor with no obvious issues. In O/D, I can't even get forward momentum going from a stop when on a slight incline. When on flat ground and in O/D, flooring the gas only gets me going a few MPH and RPMs don't go above 1500ish. When selecting 1st or 2nd, the truck still struggles a bit from a stop but does get up and going.
What happened leading up to the issue : I was on the freeway driving about 80MPH without cruise control se,t and with O/D on as usual, when the blinking O/D off light caught my attention. Not knowing at the time that this was a transmission problem light, I started pushing and holding on the O/D on/off button to try and get it to stop. Probably about a minute later, I realized I was losing speed even when giving more throttle so pulled over to the shoulder. I shut the truck off and restarted it, noted the Service Engine Soon light was now on, then I put it in O/D and gave it gas but only got going a couple MPH which it sounds like the engine was choking/struggling. I then tried D1 and D2 and, while still struggling a bit from stop, was able to accelerate up to 35+ MPH.
OBDII Codes:
P0743
Torque Converter
Clutch Solenoid
Circuit Electrical
P0750
Shift Solenoid A
P0755
Shift Solenoid B
P1747
Pressure Control
Solenoid A Short Circuit
P0443
EvaPorative Emission
System Purge Control
Valve Circuit
P0135
O2 Heater Circuit
(Bank 1. Sensor 1)
P0155
O2 Heater Circuit
(Bank 2. Sensor 1)
Troubleshooting : Transmission fluid check looks good (full and red)
Checked fuse 23 of the Central Junction Box
Held a ground wire to bottom of Transmission pan and to the frame while I started the truck, O/D light still flashing
Wiring looks good coming to the plug on the driver side of the transmission
More info:
- No "Service Engine Soon" or blinking O/D off light prior to all this happening.
- I don't believe I'm getting 1st gear. I don't recall if I got my speed up to 30+ MPH while in D1, but while in D2 I never noticed a shift from stop to ~35MPH. At 35MPH, my RPMs were around 2500 I believe.
- While cruising at 35MPH in D2, shifting to O/D results in lost power. I had to stay in D2 all the way home.
To do (I believe):
1. Check shift solenoids (looking for DIY info)
2. Check shift solenoid pack (looking for DIY info)
3. Check TCC solenoid (looking for for DIY info)
It sounds like there are a couple shift solenoids to check as well as a solenoid pack (how best to check these out, I'm still looking for)?
Ford Transmission :: 1999 Expedition - CEL And Blinking OD Off Light - Code P0755
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 cel 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?
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Early 2000 F250
Originally the truck would not go into any forward gear, but had reverse all day long. So I had a rebuild kit ordered (new bushings, seals, frictions, steels, a washer and flat bearing kit, a sprak kit, and the od piston)
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