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Asked: Jan 17, 2008 - 06:27 PM

Status: Closed

I do have 2 speed Sensors located across from each other on the top of my Transfer case right?

Thanks for your help!
The Local Chevy dealer has only told me that they will keep ordering clusters till they get one that works. They are telling me that the replacement clusters are in most cases no better than the ones they are taking out. They could be right I guess? One repair on the cluster, I think it was the second repair my Gear selector screen was blank after the repair, so nothing showed what gear I was in until they put the 3rd cluster in, but none have improved my Speedo. I've even drove 30 miles to a different dealer and same result. The bad thing is Chevy is only warranting the Instrument panel cluster so I'm almost afraid that's all the dealer is willing to believe is wrong and the truck is out of its 3 year warranty. This weekend I want to take both speed sensors out and spray them down with electric cleaner and see what happens. Two new ones are $80 and it does look as though I do have two on the top of my transfer case across from each other on the top. Wondering if I unbolt these to clean them if I'll have transfer case fluid come pouring out? Also I want to try the electric parts cleaner because it fixed my Mass Air Flow sensor when that kicked on a engine light and produced a trouble code, after spraying it to death with the cleaner and letting it dry the engine light was gone and so was the trouble light when I put it back in. You think it could be something as simple as dirty Speed sensors messing up my Speedo even though my cruise still works weather or not the speedo is? Thanks again.

In Maintenance & Repair > Electrical
1 answer - 267 days ago

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kiawah

Date: Jan 18, 2008
Time: 09:57 AM

I can't confirm/disprove that there are two sensors, as I don't have service manuals for your specific year and model. Both my 97 and 07 Burb have one VSS (Vehicle Speed Sensor) senso as per the factory service manuals, and the electrical schematics show only one VSS sensor providing input to the TCM transmission control module, which then feeds the ECM. You may be confusing some of the other transmission controls with being a speed sensor. You may want to invest in a set of factory service manuals for your vehicle. You can get them from helminc.com. You might have two for some reason, I think it's unlikely, but I guess possible.

I don't believe 'cleaning' the sensor is going to do anything, since it is an electromagnetic sensor. It's sensing the metallic fields of the teeth. What I would do is very carefully unplug the sensor, and then replug it (possibly a couple times), to make sure that the connection between the wiring connector and the sensor is good.

But again, the sensor is only a long shot, since the cruise control works fine as per the earlier discussions, and the cruise control relies on that feedback signal to keep the throttle engaged.

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avatar

kiawah

Date: Jan 18, 2008
Time: 09:57 AM

I can't confirm/disprove that there are two sensors, as I don't have service manuals for your specific year and model. Both my 97 and 07 Burb have one VSS (Vehicle Speed Sensor) senso as per the factory service manuals, and the electrical schematics show only one VSS sensor providing input to the TCM transmission control module, which then feeds the ECM. You may be confusing some of the other transmission controls with being a speed sensor. You may want to invest in a set of factory service manuals for your vehicle. You can get them from helminc.com. You might have two for some reason, I think it's unlikely, but I guess possible.

I don't believe 'cleaning' the sensor is going to do anything, since it is an electromagnetic sensor. It's sensing the metallic fields of the teeth. What I would do is very carefully unplug the sensor, and then replug it (possibly a couple times), to make sure that the connection between the wiring connector and the sensor is good.

But again, the sensor is only a long shot, since the cruise control works fine as per the earlier discussions, and the cruise control relies on that feedback signal to keep the throttle engaged.

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