I have a 98 Oldsmobile Bravada and the service 4 wheel drive light is on what to look for

SOURCE: Service 4 wheel drive

The service 4 wheel drive light comes on because there's a problem. The biggest causes of this I've seen are a software glitch in the final drive control module which the dealer can fix by reprogramming and the other is usually the electric actuator on the front axle housing. The only light that comes on by a timer is the one that says, "perform service" in your overhead console or odometer.

SOURCE: 2003 chevy tahoe service 4 wheel drive on

I had this light come on in my 2003 tahoe it ended up to be the transfer case motor (encoder motor) was bad. I got one out of a used part store and the light went off right away.

SOURCE: 2005 Grand Cherokee Limited Service 4 Wheel Drive Light On

Have the 4wd serviced

SOURCE: Service AWd light is on on my 98 olds bravada

i got a 98 bravada and my AWD light was on, what i did to fix it was replace the transfer case motor and thats all, i did a bunch of research and found out that the transfer case motor is the main conponent with of your AWD it tells the transfer case when to give the front wheels power. try replacing that

SOURCE: AWD on 2003 Oldsmobile Bravada

possibly, but the most common problem is the engagement motor located on the rear of the transfer case. Motor looks like small wiper motor and can be replace fairly easily.