Transmission p0755 - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 2 (permalink) Old 11-10-2019, 06:58 PM Thread Starter
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Join Date: Oct 2019
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Transmission p0755

Hi all,
Looking for some advice on how to proceed before spending unnecessary money on parts.
Early 99 f250 4x4 automatic with the 4r100 transmission. The truck only shifts from 1st to 2nd if you rev up really high and then let off, sometimes it takes a few cycles of doing that to get it to shift. After that it shifts normal.
OD off light blinks, pulled codes P0755 and p0705. I replaced the TRS and did not improve shifting.
I inspected the wiring on the transmission for any chafing or corrosion and it all looks great.
I am thinking about ordering a new solenoid pack but would like your opinions first.
Transmission fluid is not low and was recently flushed and refilled.
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post #2 of 2 (permalink) Old 11-12-2019, 12:22 AM
Former Ford Trans Engr.
 
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Join Date: Aug 2007
Location: SE Florida
Posts: 3,034
Re: Transmission p0755

P0755 means that shift solenoid B is malfunctioning. It needs to be replaced, so yes, you need a new solenoid body.

Did changing the TRS make the P0705 code go away?

Mark
Former Ford Automatic Transmission Engineer

ďThe good thing about science is that it's true whether or not you believe in it.Ē ― Neil deGrasse Tyson
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