Blinking overdrive button but no codes?
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Mountain Pass
Joined: Jun 2024
Posts: 114
Likes: 4
Blinking overdrive button but no codes?
Today when i left work i noticed my overdrive button was flashing while i was idling in park (97 f250-HD with E4OD). on the way home, my transmission would go out of overdrive on its own. The button seems to work but sometimes when i hit the brakes it would go out of overdrive. I did a KOEO and KOER code scan. on the 1st attempt i messed it up and got a few codes but on the 2nd attempt, i only had one code from KOEO, being 565. Not sure where to go from here because that code has to do with the EVAP system, not the transmission. I saw there is a guy named Mark Kovalsky who seems to know alot about the transmissions. I'm new to this forum still if anyone could tag him in this thread (if its possible) id appreciate it
Thread Starter
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Mountain Pass
Joined: Jun 2024
Posts: 114
Likes: 4
is getting codes for the transmission different than getting codes for the engine?
Fleet Owner
Joined: Oct 2005
Posts: 20,780
Likes: 1,746
From: Kentucky
No...
Same process, but transmission codes are Stored Codes. Which means you have to initiate the KOEO tests first, then wait for the Stored Code display.
Same process, but transmission codes are Stored Codes. Which means you have to initiate the KOEO tests first, then wait for the Stored Code display.
Fleet Mechanic
Joined: Nov 2022
Posts: 1,695
Likes: 415
I see, perhaps I was mistaking it for the RABS codes.
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Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,695
Likes: 2,616
From: SE Florida
Transmission codes are downloaded with engine codes, if your reader can read transmission codes. Not all of them can.
If you messed up and stopped the process while it was downloading codes, that will clear the codes. You may need to drive it more to get the code to set again.
If you messed up and stopped the process while it was downloading codes, that will clear the codes. You may need to drive it more to get the code to set again.
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Thread Starter
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Mountain Pass
Joined: Jun 2024
Posts: 114
Likes: 4
Transmission codes are downloaded with engine codes, if your reader can read transmission codes. Not all of them can.
If you messed up and stopped the process while it was downloading codes, that will clear the codes. You may need to drive it more to get the code to set again.
If you messed up and stopped the process while it was downloading codes, that will clear the codes. You may need to drive it more to get the code to set again.
also, I was talking to my mechanic about it today and he says it might be the range sensor that is causing this. It's already been replaced before I can tell because it looks new. And my speedometer works fine so I know it's not VSS. What do you think?
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,695
Likes: 2,616
From: SE Florida
If you get the transmission codes, we'll know where the issue is. Without the transmission codes, just start replacing everything i listed.
Logistics Pro
Joined: Aug 2014
Posts: 3,547
Likes: 845
The switch itself could be bad.
I had no trans problems or shift problems, but had random blinking O/D light, was the switch, cheapest trans part to fix.
Pull the O/D switch out and keep it off, go for a road test, do you still have it leave O/D while driving?
How fast were you going when it comes out of O/D?
I had no trans problems or shift problems, but had random blinking O/D light, was the switch, cheapest trans part to fix.
Pull the O/D switch out and keep it off, go for a road test, do you still have it leave O/D while driving?
How fast were you going when it comes out of O/D?
Thread Starter
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Mountain Pass
Joined: Jun 2024
Posts: 114
Likes: 4
The switch itself could be bad.
I had no trans problems or shift problems, but had random blinking O/D light, was the switch, cheapest trans part to fix.
Pull the O/D switch out and keep it off, go for a road test, do you still have it leave O/D while driving?
How fast were you going when it comes out of O/D?
I had no trans problems or shift problems, but had random blinking O/D light, was the switch, cheapest trans part to fix.
Pull the O/D switch out and keep it off, go for a road test, do you still have it leave O/D while driving?
How fast were you going when it comes out of O/D?