2006 F250 5.4l 4x4, long box, quad cab

Current issue: No overdrive / slipping into neutral / rough going into reverse
Codes: sorry i don't have exact code but will get (p0755)... but shows shifting solenoid B malfunction ( this is the OD/Reverse one) check engine light on and tow light blinking

So whats been done: shifting solenoid B (OD/Reverse) was replaced (used part) inspected valve body and o rings... all good... worked for a week... then exact same issue. Transmission showed no signs of gear damage, oil looks good

Next: Replaced shifting solenoid B again (new one) and transmission wiring harness. Still no change, same codes. Seems to be having a communication issue between transmission and PCM? However continuity of wires and connectors seems ok. Thoughts? help

One more piece of interesting info. Every-time before the truck slips I hear clicking coming from the fuse/relay panel under dash drivers side. No clicking no slipping... however never goes into OD at any time.


Any thoughts is greatly appreciated... I am stuck

Cool
G

 

My thoughts are that I don't know if this is or is not the code that is shown. I don't know if there are more codes. I do know that just replacing parts never works, as you're proving.

Find out what codes are really there and maybe I can help. Right now all I can tell you is that it doesn't look like it's working right.

And there is no OD/Reverse solenoid. The story on this is all mixed up. Get the real codes.

 

Thank you ....and


Sorry for the confusion. I don't have the truck with me.... its with a mechanic. I will get specific codes ... however I am confident they identified shifting solenoid B as the problem. It always the same two codes. There is also P0174 code.. swapped out o2 sensor...no change... haven't investigated further as transmission issue seems to take precedent.... I will get codes first thing in the am.


G

 

So the codes: P0755, P0758, P0174, P0420
The wiring harness that leads from the firewall is being inspected....there seems to be some belief that this wiring harness has a defect and may be causing all the issues.....

Any thoughts are appreciated...

G