No speedo and OD light flashing problem - Ford Powerstroke Diesel Forum
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Old 05-11-2013, 05:38 AM

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No speedo and OD light flashing problem

I had this problem last year. I fixed it with a new speedo sensor in the rearend.

Now its back again.
-Check the fuse.
-Speedo sensor is good, I swaped it out with my work truck one.
-Check for codes and nothing is showing.
-Traced the wires from the abs modual to senors all is good.

I have to check the trans sensor.

The only other change to the truck was the replacement of the alternator, I don't know if this would affect anything.

Any help would be great, its already cost me a speeding ticket.

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Old 05-11-2013, 12:35 PM
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Since you have another vehicle to swap parts with, swap the cluster. Also, stop driving it till you get it fixed. The OD light is on because your trans is going into limp mode from the lack of speed sensor input.
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Old 05-11-2013, 11:02 PM Rookie

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Has it rained where you are lately? My L99 did the same thing. The windshield wasnt sealed complrtely and the gem module was getting wet.

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