no overdrive od off light on
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4wd Low
Joined: Jan 2020
Posts: 11
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no overdrive od off light on
Hi Hoping some one out her can help I have an 02 f350 7.3 4x4 163k truck runs great put won't go into overdrive the od off light stays on all the time tried swapping it out with one i know works still stays on weather you press the button or not shifts smoth in every gear no slipping i feel three shifts 1 to 2 2 to 3 then lockup im guessing anyone run across this problem before any help would be greatly appreciated
Logistics Pro
Joined: Jan 2010
Posts: 4,100
Likes: 1,635
It kinda sounds like you have an issue with the OD off circuit. If I recall, there were some issues with that shifter in that, over time, the wires for the OD off switch could suffer abrasion. If they have worn through to bare wires then it won't matter if you press the switch or not, the light will come on and it will be permanently locked out of OD. IF this is your issue (and I'd want to do some continuity testing before replacing any parts), I think the only real solution is to replace the shifter stalk.
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4wd Low
Joined: Jan 2020
Posts: 11
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So I borrowed a snap on scanner and came up with a p1780 transmission switch out of self test range could I be looking at a problem with the wire harness that plugs into the transmission or possibly in the oil pan anyone experience this before
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,725
Likes: 2,651
From: SE Florida
P1780 will set if you didn't cycle the switch while self test is running, or if the switch or wiring is bad.
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4wd Low
Joined: Jan 2020
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I did cycle the switch I replaced the the shifter and the wiring and still getting the code and my od off light is still on constantly
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Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,725
Likes: 2,651
From: SE Florida
Did you replace the wiring all the way from the switch to the PCM? If not, then you still have a problem with the wiring between the switch and the PCM. Or a faulty PCM, but that is less likely than a wiring issue.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,725
Likes: 2,651
From: SE Florida
Why would you cut the loom? Looking at the wires is not a good way to see if it's good. If all you've done is look at the wires, you haven't determined if the wires are good or bad.
Unplug the harness from the PCM and the shift handle. Probe the BACK of each connector and check for continuity in each circuit, and from each circuit to power and to ground. That will determine if you have a wire broken inside the insulation or a short to power or ground anywhere in the circuit. Anything less than that is just guessing.
Unplug the harness from the PCM and the shift handle. Probe the BACK of each connector and check for continuity in each circuit, and from each circuit to power and to ground. That will determine if you have a wire broken inside the insulation or a short to power or ground anywhere in the circuit. Anything less than that is just guessing.
Fleet Mechanic
Joined: Oct 2017
Posts: 1,704
Likes: 164
From: Southwest Ohio
Checking for voltage isn't the best way to test wiring. You might read 12 V but not have enough current. You need to load the wire (typically with a test light) in order to have accurate results.
-- Dave
-- Dave