i have an 05 f 250 and the 5r110 auto trans. the original trans went out at 74000 miles so i bought another used trans (suppose to be in good working condition). the new trans was completely flushed of any debris, installed, and was filled with all new trans fluid. i then took it for a test drive and after a few miles it threw code P0756 (solenoid B performance or stuck off), the tow/haul light was flashing, and it wont shift into overdrive so i replaced the solenoid and put all new fluid in it again and im still having the same problems. :fustrate: any help would be much appreciated.
05 F250 Auto Transmission issues
- Thread starter shelton15
- Start date
Mark Kovalsky
Active member
The code means the solenoid is mechanically stuck. When the PCM commands the solenoid on the armature doesn't move. Either the new solenoid is also stuck or you replaced the wrong solenoid.
Mark Kovalsky
Active member
A bad solenoid is the ONLY thing that can set that code. When a code sets the tow/haul light flashes to tell you there is one or more codes stored.
Mark Kovalsky
Active member
How did you test them? I can tell from here that an ohm check will show that both are good. The code that set shows that the armature is stuck, not that the electrical part is open.
Unless you are watching for the solenoid armature to move when commanded you are not doing a test that means anything.
You have a bad solenoid. Maybe two.
Unless you are watching for the solenoid armature to move when commanded you are not doing a test that means anything.
You have a bad solenoid. Maybe two.
A performance code can also be electrical I have seen it before. The computer is only looking at resistance to throw electrical codes. You could have a wire in the b solenoid circuit that can't carry the amperage to activate the solenoid properly causing a performance code. What codes would set in the first trans u pulled?
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Mark Kovalsky
Active member
The computer is looking for an inductive kick when the armature moves. The solenoid performance code does not look at resistance. An open or shorted circuit will set an electrical code, not a performance code.
Trust me I have seen it before where a wire that is highly corroded have good resistance but cannot carry the amperage to activate the solenoid especially on a linear solenoid like these are it takes a fair amount of amperage compared to your basic on/off type solenoid. An electrical related problem CAN cause a performance code personal experience.
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the first trans is COMPLETELY shot. what do you suggest i change now? the wires going to the B solenoid?
Last edited:
im going to check the wiring next and no i have not changed the cooler. i found that post you are talking about the other day. this might sound stupid but what was the part in that picture? this is the first time ive ever tried to work on a transmission.
sootie
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i have a 108k mile trans that functioned fine when pulled out of a truck that rolled if you want it. 850.00 shipped with convertor.
oh ok thanks for the help. im going to pull the old trans apart first just to learn how it all goes together and then pull the new one out of the truck and go through it
thanks but im going to try to fix this one since i know a few things to look for now and if i still don't have luck im going to send it to a friends shop
Mark Kovalsky
Active member
There are two bolt holes that have threads. You thread a slide hammer into those threads and use it to pull the pump out.
