Click this to see the Video of what’s going on.
This is a 2007 Sierra 2500HD classic with an LBZ.
It’s always done this since I’ve had it and I would like to fix it.
When I drive the truck in low range, I will get an ABS / Service Brake System warning and the speedometer drops to zero. Stopping and starting again will reset things. As soon as I switch back to high range the warning goes away.
My working theory is that the computer doesn’t know it’s in low range for whatever reason.
The transfer case and the output speed sensor are new but like I said, it’s been doing this since I bought it.
This is a 2007 Sierra 2500HD classic with an LBZ.
It’s always done this since I’ve had it and I would like to fix it.
When I drive the truck in low range, I will get an ABS / Service Brake System warning and the speedometer drops to zero. Stopping and starting again will reset things. As soon as I switch back to high range the warning goes away.
My working theory is that the computer doesn’t know it’s in low range for whatever reason.
The transfer case and the output speed sensor are new but like I said, it’s been doing this since I bought it.