@FLASHING OD LIGHT@ PLEASE HELP!!!!!
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@FLASHING OD LIGHT@ PLEASE HELP!!!!!
I have a 1999 F350 7.3 Automatic Transmission. Recently my overdrive light has started flashing and truck shifts funny in 1-2 gears but goes off and stays off as long as I don’t come to a complete stop. At 1st I would have to turn the truck off then back on in order for the light to go out. In the last week I have been able to drive truck all day and the light may come on a couple times but that’s still too much. I have serviced transmission changed fluids and filter. I have changed the sensors on the transmission as well as the overdrive button and the speed control output sensor. I took it to a shop last week bc I was hoping it would show a code but every time his scanner would communicate with my truck it would cut off. Now I have been told it was the pcm the Gm module the ecu and the transmission harness as well as the transmission. I might need to mention I had the transmission rebuilt feb 2020 but didn’t start driving it till September. I have read could be shift Solenoid but really don’t know where else to turn. I use my truck for business and I need to get back to work Could anyone point me in the right direction?????? And I have No check engine light that comes on
Last edited by Greg Scott; May 5, 2021 at 09:57 PM. Reason: Change title
Postmaster
Joined: Nov 2015
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From: Colorado Springs
Laughing Gas
Joined: Jun 2017
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From: CSRA, SC
What shop are you taking your rig to and what tool are they using to read codes? I have run into a few tools that would cause my truck to quit as well, mainly cheap OBD2 bluetooth scanners. You need someone that's using a tool that is compatible with the OBD2 scheme on our rigs which I guess is not as common as the schemes used on more regular passenger cars. I suspect you'll be told you need to tell what codes it has before many answers can be given. You don't want to hear what my guess is.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,717
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From: SE Florida
As has been mentioned above, you need the codes to fix this. It could be a shift solenoid. It could be wiring. It could be the PCM. It could be....
Without knowing what codes are set all I can tell you is that you need to fix what's wrong. If I knew what codes were stored I could tell you exactly where to look.
You can reads codes with Forscan. It is a free download at www.forscan.org. There is an article on their page that tells you how to pick an adapter to plug into the OBDII port. I bought mine for less than $30 from Amazon. Or you could take it to a shop that has better tools than where you already took it, or to a Ford dealer.
Without knowing what codes are set all I can tell you is that you need to fix what's wrong. If I knew what codes were stored I could tell you exactly where to look.
You can reads codes with Forscan. It is a free download at www.forscan.org. There is an article on their page that tells you how to pick an adapter to plug into the OBDII port. I bought mine for less than $30 from Amazon. Or you could take it to a shop that has better tools than where you already took it, or to a Ford dealer.
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