2000 Jimmy Service 4WD

[cudakid67]

After my vehicle has run for a few minutes the Service 4WD light comes on, this happens every time I drive the vehicle.

I can shift it out of 2HI into Auto4WD, 4HI and 4LO...however, it will not go back into 2HI at all. If I unhook the battery for about 5 minutes and restart the vehicle it is back in 2HI.

I been told it could be a number of things, from the Transfer Case Control module, a vacuum leak, an actuator, shift module, etc.

I have a Chilton manual that gives details on how to replace parts, but doesn't really give any details as what needs replaced.

A couple of questions I have:

I've read about a number of different problems with 4wd, but I am wondering if anyone has experienced this particular problem and how was it fixed?

If I take it to a dealer and have them run the codes, does this tell them specifically what is wrong with it, or is it still a guessing game?

Does this light come on if the vehicle actually needs to have the transfer case serviced?

[loca247]

I had a similar problem. It would engage in 4HI but not disengage. I found a resolution on this web site! Put the Jimmy in Neutral and push the 2HI button. It should disengage 4HI and engage the 2HI. I did have have it repaired because after a while, when the 4HI was engaged it didn't engae all of the way so there was a grinding sound. Jimmy's are notorious for this to happen.

The problem was the vacuum and the actuator.