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Old 09-22-2012, 11:35 AM
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Speedometer not working..

Where is the sensor for the speedometer? It's not working and I have some dumby lights on the cluster.. Thanks!

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Old 09-22-2012, 11:36 AM
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rear axle on top / does ABS also 1 bolt 10 or 13 mm I think
pull and clean it's called a VSS = Vehicle Speed Sensor
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Old 09-22-2012, 11:40 AM
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I replaced that but it still doesn't work.

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Old 09-22-2012, 12:00 PM
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That's the abs sensor, not the vss. Any help please

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Old 09-22-2012, 12:56 PM
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Oh OK then
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Old 09-22-2012, 01:17 PM
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Idk about these trucks, but on Chevys the vss is in the Trans tail housing


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Old 09-22-2012, 01:24 PM
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this aint a cheby
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Old 09-22-2012, 01:31 PM
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You have an output shaft speed sensor on the top of the tailhouse on the transmission. If it fails though, you should get a code P0720. If you aren't getting any codes, makes me wonder if it isn't a problem with your cluster. May be cheap enough just to swap that out to see. I am not sure which of the two, OSS or the VSS sends the speedometer signal of the top of my head.

**EDIT** looks like the axle sensor they are calling a wheel speed sensor, so I think an assumption that the OSS would be the one to send a signal that will feed the speedometer, but like I say....when it fails, you should be getting a code...

Last edited by f250Jason; 09-22-2012 at 01:37 PM.
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Old 09-22-2012, 01:49 PM
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got a pic of this OSS on the tailshaft?
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Old 09-22-2012, 02:31 PM
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Quote:
Originally Posted by ZMANN View Post
got a pic of this OSS on the tailshaft?
From the service manual.....did you not believe me? lol
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Speedometer not working..-oss.jpg   Speedometer not working..-oss2.jpg  

Last edited by f250Jason; 09-22-2012 at 02:35 PM.
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