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post #1 of 8 Old 05-24-2011, 04:11 PM Thread Starter
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easy question

overdrive light's flashing and i cant remember what that could mean. but as a side note, i cant get overdrive to go off(light up) when i press the button

1999 7.3L F-250
397000 Miles @ Last Check
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post #2 of 8 Old 05-25-2011, 05:22 AM Thread Starter
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maybe its not such an easy question?

1999 7.3L F-250
397000 Miles @ Last Check
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post #3 of 8 Old 05-25-2011, 05:44 AM
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That light, when flashing, is like the SES light for the engine. It's telling you there are transmission codes present.

Could be a lot of things, one of the most common is the wires going to that switch, under the column, at the pivot point for the shift selector, chaff through and short....
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post #4 of 8 Old 05-25-2011, 05:50 PM
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Like NoRalPh said, that flashing light indicates that there is some sort of problem that has set a code. Mine was flashing when I first got it because the transmission range sensor (mounted on the drivers side of the auto tranny) was faulty. I was thinking there was some other sensor located in the rear axle housing that was a common culprit of this same problem also. But not exactly sure what it is called or where it's located.

Last edited by sluhbmet; 05-25-2011 at 05:57 PM.
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post #5 of 8 Old 05-27-2011, 12:50 PM Thread Starter
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YES!!!! im very happy to hear i dont have to put in a 4th transmission. thats sort of making sense because it turns off around 50, and my speedometer doesnt work until 38 and drops to 0 as soon as i slow lower than 38..even my edge wont read the speed between 0-38 anymore.

1999 7.3L F-250
397000 Miles @ Last Check
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post #6 of 8 Old 05-27-2011, 01:20 PM
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I did some further reading and found that the vehicle speed sensor (VSS) which is the sensor located in the rear axle housing can cause symptoms that match yours if it goes bad. I always like to recommend that you pay for a diagnostic at a dealer to be absolutely sure, but your symptoms seem to match others that had a bad VSS.

When my OD light was flashing my speedometer worked perfectly and the tranny shifted normally. It would stop flashing as soon as the truck started moving and resume when I put it in park. Looking back, I'm glad I paid the dealer for the diagnostic because I would have bought a new VSS when I really needed a transmission range sensor.

Hope this helps.
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post #7 of 8 Old 05-27-2011, 01:23 PM
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99% chance it is just the sensor on top of the rear diff. But I'd read codes first.
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post #8 of 8 Old 05-27-2011, 01:28 PM
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