1999 Ford F250 ABS light on, Speedo Not Moving, Overdrive Light Flashes. - Ford Powerstroke Diesel Forum
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Old 10-07-2010, 06:20 AM
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1999 Ford F250 ABS light on, Speedo Not Moving, Overdrive Light Flashes.

For the last 4 days in the morning my 1999 F250 7.3 liter 4x4 diesel has started with a solid ABS light. If you try to drive, the speedo doesn't work and the overdrive light starts flashing. In reading extensively on the forums, I started with the rear differential VSS sensor. I pulled it out and cleaned it put it back in. Still the problem persists only in the morning. In the afternoon the ABS light has yet to come on. I was curious if this could possibly be the output sensor on top/back of the tranny. I have yet to come across an issue where its occurring in the morning. Any thoughts? I might just go buy the VSS sensor for the rear and check that.
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Old 10-07-2010, 07:38 PM
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go buy the VSS sensor. Mine did the same thing.
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Old 10-17-2010, 07:40 AM
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^ exactly what mine did, my sensor wasnt out but the wire going from the main wire loom to the sensor has a small crack. when the tape and loom wasnt cracked. Took alot of ohm testing to find it.
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Old 10-17-2010, 02:09 PM
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Hopefully it's not your speed sensor ring, mine was doing that, I replaced the Vss and it still didn't fix it pulled the diff cover and somehow the speed sensor ring was gent! Also when you pull the Vss out they have a bad habit of coming apart so lime the other said just replace it it's only like 20 bucks at ford
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Old 10-16-2013, 05:33 PM
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I also have a 99 f250 super duty and my abs light is on, my speedometer is dead and my transmission is shifting hard and staying in each gear longer then usual. I replaced my abs speed sensor and still have the same problem. I have checked the wire leading to the sensor from the union at the frame. Anyone have any answers.

Last edited by steve mac; 10-16-2013 at 05:39 PM.
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Old 10-17-2013, 04:05 AM
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on my 2001 the ABS light came on, I had some brake fluid leaking around the resovoir, figured it was low on fluid. That day at lunch time, I fired up the truck to go fetch some viddles and smelled wired burning. As I stopped in the parking lot to make a turn, I saw light smoke emitting from under the hood.

With my cat like reflexes and a breath much like of Superman, I opened the hood, jumped up on the drivers side front tire and blew out a fire with flames about a foot high.

The resovoir mounted brake sensor had badly frayed wires that shorted out and caught friggin' fire.....

BTW- my speedo had stopped working as well. I cut the wires to the sensor and taped them up until I could get a new one wired in, speedo has been working ever since......but the my friggin' up pipe started leaking, no boost, high egts. my truck iz possessed... needs an exorcisiom

Last edited by XR-2001; 10-17-2013 at 04:08 AM.
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Old 10-17-2013, 02:52 PM
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shifting hard speedometer dead ABS light on engine lite on

Quote:
Originally Posted by wbones9 View Post
go buy the VSS sensor. Mine did the same thing.
I was driving and my tranny down shifted my ABS light came on and my speedometer went to 0. I changed the ABS VSS and that didn't fix any of my problems. What can I try now?
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