ABS and speedo problems
Postmaster
Joined: Jan 2008
Posts: 3,174
Likes: 10
From: Kansas City MO
I think it might be more than just the vss, or even the harness. If there is a failure in the rear vss, the pcm then looks to one of the front abs sensors for speed input. And the cruise should work while the abs light is on(that is, if its your rear vss). The cruise and speedo will momentarilly not work with a rear vss failure, but then will start working when the pcm starts looking at the front sensors
for input. At least that was how my truck acted when my rear vss harness went bad.
for input. At least that was how my truck acted when my rear vss harness went bad.
Lead Driver
Joined: Sep 2007
Posts: 8,180
Likes: 669
From: Scio, OR
I can't speak for your truck, but there have been many, many reported cases of a failed VSS causing the speedometer to quit working, the ABS light to come on, the Tow/Haul light to flash and the transmission shift patterns to go to hell.
In most cases, replacing the VSS solves this problems. In fewer cases there is a wiring harness issue.
At least that's what I've observed over the years here. The VSS is held to the top of the differential case with one bolt and is not difficult to change.
In most cases, replacing the VSS solves this problems. In fewer cases there is a wiring harness issue.
At least that's what I've observed over the years here. The VSS is held to the top of the differential case with one bolt and is not difficult to change.
4wd Low
Joined: Apr 2012
Posts: 12
Likes: 1
From: Central Florida
About 8 months ago, I had the same problem. I replaced the rear VSS sensor and spent countless hours pinning the harness. Finally gave up and took it to the dealer, turned out to be a burnt circuit board in the windshield wiper motor.
Sounds strange, they replaced it and I haven't had a problem yet.
Sounds strange, they replaced it and I haven't had a problem yet.
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