2014 yukon denali- speedometer not working

[muncie21]

Out of the blue, the speedometer on my 2014 Yukon XL Denali quit working. Along with this the odometer, trip and digital speed display also quick functioning. My research has me looking into the speed sensor mounted on the transmission or the gauge cluster.

Any suggestions on how to narrow down these two culprits (or if there's a third one, aside from wiring) that I should look in to? My inclination is to replace the speed sensors as it's cheap and quick. The gauge cluster, not so much....

 

[B-train]

I would go after speed sensor first as well. But, before doing so, does it shift and drive fine? If shifting is all wonky, then I'd lean towards sensor. I would think that feedback is necessary for the TCM to do its job.

You could try unplugging it and taking a test drive. That may help you rule put that part.

 

[muncie21]

I would go after speed sensor first as well. But, before doing so, does it shift and drive fine? If shifting is all wonky, then I'd lean towards sensor. I would think that feedback is necessary for the TCM to do its job.

You could try unplugging it and taking a test drive. That may help you rule put that part.

It drives OK. No issues and no codes.

Any idea where the VSS is on these AWD vehicles? From what I've read the sensor should be on the transfer case behind behind the transmission. However, I wasn't able to find any connections remotely resembling the 2-pin connector for the VSS.

 

[Fless]

You could see what values the various speed sensors are reporting with a scan tool that can read them.

 

[Geotrash]

I suspect a problem in the gauge cluster. If you had a VSS problem you would have drivability problems and codes being thrown.

 

[Doubeleive]

like fless mentioned a mediocre scan tool would tell you for sure if it is the vss or cluster gone goofy

 

[muncie21]

More info on original issue and current status-

I was at Lowes picking up some mulch and left the truck running while we loaded the mulch. While driving away, I noticed the speedo wasn't working. When I set my DIC to read vehicle speed, nothing was registering there either. Tried shutting off the engine and restarting multiple times, no change.

Got home, unloaded the mulch and restarted the truck the next day. The speedo issue was gone. No idea what caused it or how it 'fixed' itself, but glad it did.