Seandalecox

Hello all,
I'm new to the site and hoping to get some help with a problem. I have searched the threads and have not found my issue.

I have a 2007 suburban ltz and my speedo stopped working around 50 mph. Works great unto there but nothing after. If I'm causing at highway speed (with a gps) sometimes it slowly drops to 45. All other gauges work great. I have replaced the stepper motor, the speed sensor on the transmission and ever replaced the ECU with a new one that was programmed to my truck. Normally I trouble shoot until I find exactly what's wrong but this is getting frustrating and I could really use some fresh minds on this.
Thanks everyone in advance for the help.


*******update******* swapped gauge cluster with a friend whose works perfectly. Mine worked in his but the same thing happed in mine that has been going on. Only goes to 50mph

tech2

which speed sensor on the trans did you replace...there are 2
any codes setting?
any shifting problems?
do you have a scan tool that can view the trans data?

Seandalecox

I did not know there was more than one speed sensor on the transmission. I replaced the rear vss that I got from autozone. The only shift problems I have had are when at highway speeds when the speedo drops 30 or so. It wants to rev but that's the only time. My scan tool is the foxwell 510 elite and I did get the rear vss code but it's gone now that I replaced it.

raehzrh

which speed sensor on the trans did you replace...there are 2




Kodi nox

Seandalecox

I replaced the one at the back of the transmission/transfercase. I did a live reading on my scan tool while driving and it is reading the vss accurately. The scan tool shows exactly how fast I'm going and it matches my GPS. I'm so cumfused.
Where is the other one located?

le_Tump

hello all

I have the same problèm,

I already repalced the vss but the problem is still here

Have u found the solution since ?

Thanks for answer