Hello All,

I own a 94 Ford E-350 ex-u-haul box truck. 7.3 Navistar Diesel engine. I noticed that my overdrive OFF light was flashing on my shifter. I engage and disengage it and it would not stop. The only time it would stop temporarily was when I shut the truck off. Or shift to park. The truck seems to shift hard now and then and the trans was rebuilt around 40k miles ago. Any ideas? Thanks.


Joe Flash man

 

Read the codes. The flashing light means something is wrong and a code was stored to tell you where to look. Without the code nobody knows what's wrong.

 

Where do you go to find out what the error codes actually mean? A friend is going to hook my truck up tomorrow to find out what the error code is but what then?Just bought this truck. Drove her twice and now this!The way it is shifting is painful.
1999 ford f-250 4x4 lariat flashing o/d lite. shifts like ____.

 

Glossaries, Decoders, Codes, & Charts .: Articles You should get all the engine and trans codes here.

 

Thanks for the info guys.


Joe Flashman

 

Ok I got the codes and they are- p0755 p1715 what next?My buddy cleared the errors and after 5 minutes of driving the o/d lite is flashing and shifts like crap again!

 

You have an electrical failure in the Shift Solenoid "B" circuit that is keeping the solenoid from operating when commanded to do so by the PCM.

Probable faults, in no particular order:

Faulty PCM
Faulty solenoid
Faulty transmission harness (internal)
Faulty harness from PCM to transmission
Faulty connection at the transmission mating connector.

The workshop manual has step-by-step instructions on how to diagnose and repair.

 

Go figure some one suggested I clean the battery terminals (they were dirty) and my check engine lite went out.She shifts like a dream and the od lite is no longer flashing!

 

Guess I spoke too soon.Not fixed.Drove about ten miles and then it started again.

 

I wasn't going to burst your bubble, but I knew that didn't fix it. Disconnecting the terminals cleared the codes which makes it run like normal until the PCM detects the problem again.

There are instructions above on exactly what you should do. Either that or take it to a pro to fix it.

 

"Faulty connection at the transmission mating connector." Go for this one first. I had a similar problem. Mine became loose and was not seated all the way. Also had crud in the bottom of the socket from our latest flooding episode.

 

thanx Mike 93 Its not something obvious like that. going to the tranny shop.Ive heard nightmare story's about big bills and still the same problem!thanks again.

 

Took her to Amco trans. in calgary.They tell me there is a mechanical issue inside the tranny and they will pull it. Inspect it and get an est.Here we go...should get a call this aft.Only drove it twice.

 

Took her to Amco trans. in Calgary.They tell me there is a mechanical issue inside the tranny and they will pull it. Inspect it and get an est.Here we go...should get a call this aft.Only drove it twice.

 

So the tranny guy says 4 k to fix. 2nd gear went and took a bunch a stuff with it.I dont know what to say.