Faulty Speed Sensor or faulty ABS Module?

2001VolvoXC70 · Post by **2001VolvoXC70** » 06 Sep 2010, 02:38

Put in the Abs sensor and the abs light is now off. The tracs light comes on after 10 minutes or so, and also I still have the check engine and service transmission message.

2001VolvoXC70 · Post by **2001VolvoXC70** » 06 Sep 2010, 02:53

Does anyone know what the system checks for to determine whether the TRACS light comes on or stays off? It seems like mine stays off until I reach a speed of 50mph, then turns on and it doesn't turn off if I slow down. When I turn off the car and back on again...the TRACS light stays off until 50mph or so.

skeeter123 · Post by **skeeter123** » 07 Sep 2010, 11:29

Have you altered the tires/wheels from OEM? Or are they worn unevenly? If the the tires/wheels are unevenly worn, or if you've got non-OEM wheel sizes on, the wheel sensors won't report consistent results to the computer, which may trigger the traction-control s/w to think there's a problem.
Hope this helps.

2001VolvoXC70 · Post by **2001VolvoXC70** » 12 Sep 2010, 01:42

Thanks Skeeter,

So is the TRACS light circuit a simple diagnosis of the wheel speed sensors or is there more to it?

I have changed the tires, but with OEM sizes. The tracs light was coming on at higher speeds with the old tires and now with the new tires, so I don't think that is it. I have also changed the front right wheel sensor, I will have another look to see if it is installed correctly, or if it has picked up any dirt.

Also, of late I am hearing a noise that tends to get louder with acceleration. I think I am getting a faulty wheel bearing. Don't know how to diagnose wether it is front or back but it is louder when on the highway turning left then when turning right. I wonder if this could relate to a bit of play and an abstract reading of the sensor which is triggering the TRACS light.

JayPinNC · Post by **JayPinNC** » 29 Oct 2010, 08:16

I had a similar sound - only happened when I turned right. I had my ABS, CEL and STC lights on and it turned out to be a loose axle bolt. Caused enough play that the sensor was likely missing the hub. And by loose, I mean the bolt was all the way out and was only being held in by the center cap on the wheel.

2001VolvoXC70 · Post by **2001VolvoXC70** » 22 Dec 2010, 03:47

Hmmmm, sounds like you got lucky that more damage didn`t happen. Mine was the rear wheel hub. $100 bucks off ebay and an easy install fixed it up. But Im still getting the tracs light coming on after about 1km of travel...everytime. Wish I could figure this one out!

DoItMySelfGirl · Post by **DoItMySelfGirl** » 02 Jul 2018, 07:57

That exactly what's going on with my car, ABS and check engine light is always on , but when that brake light is on , I know I'm gonna look down and see my MY mileage turn to dashes and my speedometer not work.Turn car off and most the time it reboots computer. Other times I have to shifts myself other times it does not effect it. Codes say it's tranny speed sensor, the car can send confused codes , no?