01 F350 Auto Trans Pressure Problem?? - Ford Powerstroke Diesel Forum
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Old 09-24-2008, 06:44 PM
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01 F350 Auto Trans Pressure Problem??

I've got an '01 F350 Powerstroke with an Auto Trans. I've only recently purchased it & was told that the PO spend an obscene amount in repairs & maintenance over the last year, including a tranny rebuild, but I can't confirm this for sure. The truck has a lot of miles, but seemed to run & drive perfectly without a hint of a problem until a few days ago.

Problem: Without warning, the truck stopped moving while in a parking lot. No response in any gear, just like it was in Park. When the engine is turned off & left to sit, the trans works fine when started up again, but only for a minute or 2 before it seems to start to slip & then gives up totally again. Leave it sit for 1 or 2 minutes & the cycle repeats. The OD Off switch is seized & I'm not sure if the light works or not...I suspect not. I tried to hook up a scanner to check for codes, but it will not link up (but worked fine on other Ford trucks)... it appears that there are 5 or 6 wires in the harness that goes to the diagnostic connector that are cut, so I'm not sure if this is why. Anyway, I can't check for codes as far as I know.

With the nature of the problem, I'm suspecting a loss of pressure, possibly a pump or EPC solenoid? Could this be right or am I out to lunch? The truck does have an Edge Juice Powerprogammer and I've had friends that have had problems with these things & removed them. I first suspected this as a sourse of the problem, but I'm not guesing that it is a pressure problem. Because the problem comes & goes, I suspect the solenoid instead of the pump. If I'm correct, how exactly do I identify & possibly test this part (I'm assuming that you'll find it by removing the pan)? Any help or feedback would be appreciated. I'm hoping that I don't have to pull the tranny to fix the problem, but don't mind if needed.

Thanks!!
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Old 09-24-2008, 06:52 PM
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Your going to have to have a shop with a diagnostic computer for the trans look at this. As you could have several problems going on here.

Could be a solenoid in the valve body, could be a bad torque converter, could be internal problem inside the trans, could be a pump, I could go on and on about what it could be. But with out having the proper diagnostic computer to run tests on the trans there really is no telling what is wrong with it.
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Old 09-24-2008, 07:10 PM
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I'm assuming that a trans shop diagnostic computer will still need to use the diagnostic connector under the dash. Is that correct or ? If it is, being that this connector doesn't seem to be functional, what would you suggest?
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