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Old 10-28-2013, 06:49 PM
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Abs and flashing o/d light

So I was driving my truck when the o/d light started flashing and the abs light came on. The truck shifts real hard now and no speed on the speedometer. Any ideas?
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Old 10-28-2013, 07:07 PM
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you need a new speed sensor for the rear diff. it's a cheap and easy fix
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Old 10-28-2013, 10:40 PM
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Most of the time when the VSS on the rear diff goes out it is gradual and you get a bounching speedometer. If it just suddenly died then I would lean toward a bad connection, bad PSOM or lack of power to the PSOM. Is your odometer working at all?
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Old 10-29-2013, 03:54 AM
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I don't believe so

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Old 10-29-2013, 05:32 AM
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i have the same problem, i replaced the speed sensor on the rear diff and nothing changed. What is the psom and how do i check/replace that. Are there any fuses i should be checking? They all seemed fine but i could have missed something. Also my transmission is shifting really hard.
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Old 10-29-2013, 06:13 AM
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Not sure what to tell you just checked the vss and have infinite resistance diagnosing it bad check wiring if you have power to the connector continuity in the circuit all the usual and the is a ten amp fuse in the panel in the cab
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Old 10-29-2013, 10:48 PM
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Quote:
Originally Posted by 97_Stroked View Post
i have the same problem, i replaced the speed sensor on the rear diff and nothing changed. What is the psom and how do i check/replace that. Are there any fuses i should be checking? They all seemed fine but i could have missed something. Also my transmission is shifting really hard.
The Programable Speedometer Odometer is the center section of the gauge cluster. The signal from the VSS travels to the PSOM and is converted before being sent to the PCM which controlls the transmission. If your odometer still displays a number then the fuse is good. The PSOM can come from any similar year f-series gas or diesel but it will reflect the mileage of the donor vehicle.
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Old 10-30-2013, 05:30 AM
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Okay well i am going to try a new vss just in case the one i bought was bad. But i have no mileage being displayed and no movement in the speedometer. The truck was fine until i power washed the engine bay and ended up having to replace the batteries, alternator, and some fuses. So the psom is the last thing really
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