Traction control + ABS + brake lights on

[Nate07Tahoe]

Hi all,

Recently I was driving and the traction control and abs lights blinked on then immediately off together…the blink was so fast sometimes you could hardly catch it…then it changed to them staying on and now the brake light and both of the others stay on whenever the car is on.

Since this happened I have changed both front wheel bearing/hubs including new speed sensors, as well as 2 new speed sensors in the rear. Sadly no change at all. I checked the fuses and they are fine. I tried to check wheel speed signals in real time with my foxwell GM software scanner but the scanner says no communication with the ABS system. Truck runs and drives fine, 4x4 and cruise control still function normally…any advice is appreciated.

 

[intheburbs]

First thing I do with multiple warning lights is check for battery cables. Then I check for loose grounds. Voltage fluctuations wreak havoc with the electronics.

 

[Amaster]

Next thing check fuses

 

[Doubeleive]

ditto confirm the abs system has power and communication, if the light is on then there is a code and therefore a definition of the problem

 

[Tyrant]

My problem to a T, with the addition of the 4WD service light.

Brakes feel fine, although it is next to impossible to trigger my ABS when the ground is dry... Haven't attempted it.
2 high, 4 high, and auto all work perfectly. 4 low won't engage at all, but the lights on the rotary dial function.

Started IMMEDIATELY after a "big 3" upgrade, performed properly (My umpteenth install).