2008 Yukon XL SLT--Service Traction Control/Stability and ABS

[Rabbi]

Ok guys, got a really strange issue that cropped up today after I had the dealer rotate and balance my wheels.

So prior to having this standard rotate/balance I had no service lights or abs issues. No more than 2 miles down the road after my rotation, I come to a stop light and the service traction control, service stability control and ABS lights come on. I drive about another 1/2 mile stop, cycle thru the info cluster and also notice the dealership failed to reset my tire locations...so I turn around and head back. Since i figure the dealer will take awhile I make a pit-stop to grab some food. The service lights went out once i restarted the truck, however they came back on just before I pulled into the service.

Service manager shakes his head about not resetting the codes, but is puzzled about the service lights.

Service tech pulls the truck back into the shop resets the tire locations, and pulls the codes. I'm told it's some sort of low voltage error which is causing the service lights and ABS problems; however since it's the weekend the dealer wasn't able to dig any deeper.

So, has anyone had this occur? How could a simple wheel rotation end up with service lights and ABS issues?

This evening I have driven the truck and noticed there seems to be no rhyme or reason as to when the service lights appear, but sure as taxes the lights come on during short or longer drives.

Here are a few particulars about my truck:

2008 Yukon XL SLT
Momo 24" Wheels
Brakes where replaced all the way around two months ago
Mileage: 120,3xx
Dealer maintained truck

Any help or direction would be greatly appreciated!

Thanks,

Marshall

 

[Rabbi]

service traction control, service stability control and ABS lights on:

I recently had my rear air shocks replaced with a set from Arnott. When I got I the 2008 Yukon Denali to leave, the service traction control, service stability control and ABS lights were on. My mechanic tried pulling the codes from the truck, but his diagnostic tool kept locking up with a communication error. I went home and did some research. A quick call to Arnott tech support and they immediately diagnosed the problem as a disconnected ABS / tire position control wire. Makes perfect sense, when I think about it.

Coming off the back of the axle, just to the inside the wheel housing, is a wire that goes through a couple of blue wire holders (NOT connectors) and then heads up under the bed, just above the shock absorber on each side. BOTH of my connectors were unplugged. The passenger side connector was viewable after taking the spare tire off. Look through the cross member frame hole from the back. The Driver's side connector is impossible to see without mirrors, and we could only get one hand on it (by feel) to re-connect it. Put your hand above the cross member from the front to get to it. Both connectors are blue.

We then had to clear the computer codes twice before the error messages went away. They have not reappeared since. The placement of these connectors is STUPID. GMC designers must have never thought about anyone having to get to them. Or that mechanics working on the springs or shocks were likely to pull on these wires hard enough to unplug them.

I don't know why a tire rotation/change would affect these wires, but it sure would be a strange coincidence. If one of these wires was cut or broken internally, I suspect that it would throw the same codes.

Good luck!