Hello, My 2000 Bravada AWD smarttrack not working, anti lock brakes do and no service light. Could it be the TCCM? I had another one that had a bad encoder motor but did get the service 4WD light.

SOURCE: my anti-lock brakes keep kicking

are awd light came on a few day ago...no change in the driving behavior. just had two wheel bearings replace last year. any idea what the awd disable light means now?

Thanks,
jim

SOURCE: how to change 4 wd motor(actuator) 1997 s10

Before changing the actuator check the vacuum lines at the vacuum switch on the left side of the transer case if they are wet with transmission fluid the the switch is bad and that will prevent 4wd from engaging.

SOURCE: 2002 Buick Century anti-lock brake problems

i recently had this problem too, except i had all the lights on (ABS, service vehicle, trac-off, AND service engine) they are all easy to fix without spending more than 20-30$ for labour (depending how much your mechanic charges you) mine did it for free and he found out why the engine light is on afterwards too. so to fix all these lights (abs, trac-off, and service vehicle you MUST get another ABS cable (i went to a garage, they were towing a GM vehicle to the junk yard so i grabbed some scissors and cut BOTH abs cables on each side (good thing i did because one was bad) and braught them to my mechanic. the reason the lights come on is probably a defect or in my case my mechanic said it was salt buildup in the wires (on the drivers side) so he cut the wire off and rewired the new one and BOOM all the lights came off (service vehicle, abs, and trac-off) now for my service engine it says catalytic converter but im trying to put some fuel system cleaner to help it out i read somewhere that this is a defect of the car, so if you dont have that light yet, SELL your car ASAP for as much as you can get for it (after fixing the lights of course) and always google (car name+recalls) in the search bar to see what youre getting into, take care

SOURCE: AWD on 2K Bravada not working. Service AWD light

Probably encoder motor on transfer case. Try "thepartsladi" store on Ebay for low price OEM motor.

SOURCE: Service 4wd

my 4WD shifts on it's own, and back out when i turn the engine on and off. I thinks it's a sensor but not sure.