2005 Chevy Colorado, 3.5L
ABS light is illuminated and the instrument panel indicates an ABS Fault and a Traction Fault. Traction Control system does not work nor does the ABS system appear to either.
The anti-lock braking system must be scanned for trouble codes in order to diagnose the problem correctly.
A common faults of the ABS and traction control system is a faulty wheel speed sensor. When a malfunction is detected by the ABS system, the ABS light comes on and both ABS and traction control become disabled, but you will still have normal brake operation.
We have a 2009 Colorado and every winter when it gets cold and snowy (we live in Ohio so from Dec.-March.) the ABS, Brakes, and Traction Control lights will come on. When this happens we have no heat, no head lights or turn signals, basically...the only electronic thing that works is the radio! We have had it at the dealer numerous times and they can't find a problem! REALLY? What will happen when I am driving at night and this happens? Will it take someone dying in one of their trucks to get to the problem?
The first thing to do is find another dealer to look at the truck. There may be a mechanic who has run into this problem and would know how to diagnosis it.
There is a service bulletin on the brake sensors that when in bad weather the sensors clog up with debris and make the ABS lights come on.
There is also a recall on the brake switch where it needs to be replaced because the brake lights will stay on all the time. I know this may not be related to the problem but it would still need to be done and hopefully have an impact on the problem. From what I read the switch won't be available until mid February 2014.
A factory scanner should be put on the truck when the problem occurs so the mechanic can see what is causing the ABS lights to come on and to see why all of the other systems are not working.
It could possibly be a wiring or computer issue that only a trained mechanic with a factory scanner (not a code reader) would be able to see.