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The speedometer is out and the o/d off light is flashing

Tiny
JAKEZOC
  • MEMBER
  • 1999 FORD RANGER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 135,000 MILES
I pulled it down the driveway to test and found the speedometer is out and the o/d off light is flashing. I did some research and found that this is normally caused by the abs sensor in the rear diff (also acts as the vss through gem) so I replaced it. This didnt fix a thing. I checked all the wiring and it looked good. Have not been able to test it yet but will if no other ideas. Could this problem be caused by the G.E.M or the P.C.M?
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Monday, January 5th, 2009 AT 11:12 PM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
We need to start with what codes are there. These could be related but we need to start with codes and then figuring out one of the issues and if it fixes both then that is a bonus.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

https://youtu.be/rTtAnsOlZU4

Basically, the way this works is the ABS sensor in the rear diff that you replaced sends the speed signal to the ABS module and then that sends it to the GEM and then the GEM sends that to the various other modules including the speedometer.

I attached the info below on this.

Please let us know what you find with the codes, and we can go from there. Thanks
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Tuesday, October 19th, 2021 AT 3:37 PM

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