I have a 07 Avalanche. Lately all 3 lights are on. None of the systems work. I scanned the abs codes and got a a code for "front wheel speed sensor signal irratic" I cleared the code but systems are still off. My question is will a bad sensor shut down all three systems?.

 

Yes it all 3 need a signal from all of the speed sensors. Check the wires in the wheel well and make sure the wheel bearing isnt going out also before replacing the sensor.

 

I had a bearing go out and it gave me a lot of lights.

 

Thanks guys. Thats what I was leaning towars.

 

As other have said, if one sensor doesn't read then the systems go haywire since they are tied together.