Trans won't work!

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Nov 3, 2017 | 10:06 PM

DougJ_1997PSD

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Senior User

Joined: Mar 2014

Posts: 242

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From: Tyler, TX

Trans won't work!

I was running around yesterday and when I had to run back out again, my truck seemed like it was in second with the tc more unlocked with normal, with the O/D light flashing. I reversed and the truck felt fine, but would not want to go forward fast. I parked the truck and pulled a P1748 code (shift solenoid A fault). I have since pulled the pan and shift solenoid, which sounded fine when hooked to a 12v battery. I also ohmed them out, and it seemed they were all at 19.9-20 ohms. I also tested continuity through the whole trans wiring harness and everything was ok except the red power wire. This might have been because I could not get a good point of contact with it, but my question is, could no power to the solenoids give me this code? Or wouldn't it give me a solenoid B fault code as well? Can anyone offer any insight on it? I haven't been able to find much in ways of troubleshooting.

Nov 4, 2017 | 07:54 AM

Mark Kovalsky

Frmr Ford Trans Engr

Joined: Aug 1999

Posts: 24,737

Likes: 2,664

From: SE Florida

If there is no power to the shift solenoids the transmission will be in fourth gear when the shift lever is in the D position. Reverse will work normally. The truck will go forward, but it will be very slow to accelerate.

Nov 4, 2017 | 03:10 PM