Me & my buddy been fighting with this for a month now.
It's throwing two codes right front wheel sensor & rear axle sensor.
We have replaced both sensors..
SBS light will come on/off during a trip. We thought the drive shaft was bent. So we borrowed a friends, and it does the same thing. The speedo needle jumps a little, and we tried another cluster & it still jumps.

More then likely the problem is coming from what is causing the speedo to jumping, but we can't figure out why it's jumping. We have removed the tail housing & everything looks fine.

Gears match the glove box. We pulled the cover and made sure.
Anybody got any ideas on this matter.

06 gmc cc, stock from what we can tell.

 

Anybody have this issue?

 

if you searched Service Brake System you should have ran across several threads with suggestions.

Since you've done all of those things the thing I would suggest what fixed mine, replacing the VSS on the tail shaft. (vehicle speed sensor).

 

I've searched & changed the vss sensor which is what the abs gets it signal from. But I guess I'll search more maybe I missed something.. Thanks kid

 

hmm.... the only other one that i can remember was a connection problem at the fuse box under the hood. Likely something new that I haven't seen in a thread yet. I've read pretty much all threads with this issue for the past year or 2.

 

We've tried that too. But what's funny it comes on around 20mph & goes off/on the whole time you driving and the speedo is jumping the whole time. He bought it to the dealer & they can't find whats wrong.

 

any chance he has a different tire height on the truck than stock? I remember something about a factory glitch in the sensor pulse.

 

tire size the same all the way around?

 

beat me to it, damn you

 

bahahahahaha