Help! ABS light on. speedometer jumping..
Postmaster
Joined: Mar 2006
Posts: 4,635
Likes: 0
From: The Wilderness
One thing to try is to unplug the ABS module located behind the glove box.
what happened with my truck (95 F150, 4x4, 5.8L, auto) was that my speedo started jumping, it started shifting funny, odometer quit moving and after a few days of that, the speedo died completely.
Unplugged the ABS module and everything works perfectly.
This was after I replaced the ABS sensor in the rear diff, checked all the wiring. I found out through hours of research, that the computer reads the signal from the ABS sensor in the rear, but it passes through the ABS module, if that module goes out, the computer gets a corrupted or no signal, and things don't work.
Try it out, it doesnt cost a dime and might fix it.
what happened with my truck (95 F150, 4x4, 5.8L, auto) was that my speedo started jumping, it started shifting funny, odometer quit moving and after a few days of that, the speedo died completely.
Unplugged the ABS module and everything works perfectly.
This was after I replaced the ABS sensor in the rear diff, checked all the wiring. I found out through hours of research, that the computer reads the signal from the ABS sensor in the rear, but it passes through the ABS module, if that module goes out, the computer gets a corrupted or no signal, and things don't work.
Try it out, it doesnt cost a dime and might fix it.
Thread Starter
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Freshman User
Joined: Apr 2009
Posts: 26
Likes: 0
I Unplugged the ABS module but speedo is still jumping. ABS light now is off.
initially I replaced ABS sensor. I think next step is PSOM to correct speedo.
ABS module unplugged may affect the truck seriously??
initially I replaced ABS sensor. I think next step is PSOM to correct speedo.
ABS module unplugged may affect the truck seriously??
Posting Guru
Joined: Sep 2008
Posts: 2,379
Likes: 2
When you get the PSOM out, check for capacitors that have fallen out or ones that are loose on the circuit board.
Posting Guru
Joined: Sep 2008
Posts: 2,379
Likes: 2
You should have some trim pieces that run horizontal, just below the level of the shifter. Those should pop out and you will see some screws under there. You need to remove those first. If you are unsure of what I am talking about, post a pic and I can point them out to you
Postmaster
Joined: Mar 2006
Posts: 4,635
Likes: 0
From: The Wilderness
Won't have rear ABS, not that the rear ABS does a whole lot to begin with.
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Senior User
Joined: Dec 2010
Posts: 359
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From: Shafer, MN
Im sorry to bring up an old thread- but I just bought a 93 f150 and am having issues with my spedo flicking at anything above 45 mph- did we ever nail down a real concrete answer as to a cause?
I cannot be unplugging ABS- Just to risky where I live and this time of year
I cannot be unplugging ABS- Just to risky where I live and this time of year
Senior User
Joined: Nov 2014
Posts: 104
Likes: 0
From: Upper Michigan
My speedo starts jumping after 60 mph. I attribute it to maybe a defect on the tone ring in my rear end. Hopefully I will be able to check into that after the snow is gone. I don't drive must past 60 anyway.....in my truck that is. There is a lot of information on this forum about this issue.
Fleet Owner
Joined: Oct 2005
Posts: 20,789
Likes: 1,753
From: Kentucky
Im sorry to bring up an old thread- but I just bought a 93 f150 and am having issues with my spedo flicking at anything above 45 mph- did we ever nail down a real concrete answer as to a cause?
I cannot be unplugging ABS- Just to risky where I live and this time of year
I cannot be unplugging ABS- Just to risky where I live and this time of year
There are multiple causes of your issue, a defective RABS module is common.
Senior User
Joined: Dec 2010
Posts: 359
Likes: 0
From: Shafer, MN
I had figured I would try replacing the speed sensor first, and your right, there is a LOT of information, different ideas and opinions, which is why its confusing and I have to ask where to start, but like I said I think speed sensor is first.
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