Ford F-150 - 1997-2003 :: OD Cancel Button Is Illuminated Constantly - It Will Not Toggle Off
Jul 5, 2017
Just serviced an '03 F150 (4.6/4R70/4x4, 129,000 miles) where the shifter had come clean off. I replaced it with the Dorman replacement and had the battery disconnected during replacement just in case.
Once it was all hooked up I put the neg batt cable back on and turned on the key. If I hit the OD button it would only illuminate momentarily, ie so long as I was holding the button. I thought that odd so I started the truck and then hit the button again at which point it blew fuse 29.
I replaced Fuse 29 and now the OD cancel button is illuminated constantly - PRND21, doesn't matter. It will not toggle off. I thought maybe it was the switch itself at the end of the shifter and I just happened to have a new-in-the-sealed-bag Ford OEM switch that I swapped in, but no change. I also pulled the Dorman part again and checked for a short between the three wires that run in the shifter, but they're all good.
Then I pulled Fuse 29 and it still won't shift into OD while driving on the highway.
Oh, I will say it appears to be overfilled, I'm gonna see if I can suck some out of the dipstick tube but I'm not confident an overfill would cause this.
OD cancel light always on (does NOT flash). Will not shift into OD at any speed. No codes.
Basically I think something is wrong mechanically and the truck is trying to say so with the constant OD light.
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