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'99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the '99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

 
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post #1 of 2 (permalink) Old 07-15-2019, 07:01 PM Thread Starter
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I have a 99 F450 with the 7.3l. The speedometer/odometer stopped working and the overdrive us flashing. I changed both VSS sensors and it still doesn't work. I just had it checked and there are no codes being thrown. Any help would be appreciated.
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post #2 of 2 (permalink) Old 07-16-2019, 08:27 AM
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If the overdrive is flashing, you have transmission codes. You need a scanner capable of reading them. When I had this happen, it turned out the wiring harness coming from the VSS was self destructing. I bought a new pigtail for the VSS, but when I went to splice it in, the wiring was chalky black powder. I cut up a few inches - still oxidized wire. I ended up cutting a couple of feet forward of the VSS before I found good copper. Spliced in a new wire and problem solved. Yours could be the same, or it could be something completely different. The code will help narrow it down.

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  Diesel Forum - TheDieselStop.com > 1999-2007 Ford Super Duties > '99 & up 7.3L Power Stroke Engine and Drivetrain

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