Let me start with basic information on the truck here.
2000 model year
F350 crew cab dualie shortbed
3.73 rear gears
235/85/16 tires all around
I recently purchased this truck a month ago after it had been sitting for 4 years and before I started driving the truck every last fluid was changed including filters as well.
The problem arose last Sunday which was the first time I have driven the truck in the rain. The truck started normally but after driving approximately 200 yards my O/D light started flashing a trouble code and put itself into limp mode. The code was PO755 which was "shift solenoid B". Now the only thing that had changed since it had been on the road was the introduction of condensation. Now on one of my old 7.3 IDI
trucks with an E4OD
the plug would fill with water and cause a limp mode condition. I would unplug it and blow the connectors out and voila problem solved.
I've personally verified 12.4 volts coming to end of the harness where it plugs into the solenoid pack. The connectors are clean with no breaks. The wires appear to be in good condition with no chaffing or rub through. I found a replacment solenoid pack locally for 235 out the door and have no problems replacing it myself but I'm not wanting to throw parts in that aren't needed.
As I said, the only thing that changed was the fact it was driven in the rain. Truck sat overnight before trip and it occurred right away. It's been hot and dry since and problem is still there. This has me stumped.
Thanks for any help.
P.S. fluid is still clean, not burnt, no metal shaving in pan or anything g like that either. It appears to be electrical only.