jsindorf

Please note: this is not the constantly flashing indicator light problem or the 4wd will not disengage problem... it may be the same solution, or not, but the symptoms are not the same.

My 4wd on my 99 Limited (auto trans) has worked perfectly -- up until this past week. Nothing startling happened to adversely impact it that I know of.

Today it was snowing hard, and a hill was unplowed and I pushed the button on the side of the 4wd shifter and after a few brief seconds of the indicator flashing (green wheels and orange dot) the four green wheels stayed on bright and good. I got up the hill and pushed the button and the indicator flashed and went out. All good.

Later I had a deeper, more slippery area to go through, so I pulled the handle back to go into 4Hi L -- but the indicator didn't light up at all... nothing. I pushed in the button with the handle in 4Hi L and the green wheels illuminated (but not the orange dot).

So, I was a bit perplexed. I put the handle up into 4 Low and again nothing on the indicator light. If I pushed the button in, then I get the 4 green wheels but not the orange dot.

So... it sounds to me like a sensor or something is on the fritz. Have any of you encountered this? Where should I start looking?

(by the way, I did a ton of searching and found many posts about the 4wd not disengaging or indicator light constantly flashing, but nothing that talked about this problem.)

Thanks in advance...

RPS99SHO

There are a few sensors on the TC you're going to want to check.



The sensors marked center diff, neutral position, and L4 switches need to removed and checked. It's a pain, but is likely your issue. Also, there are two very easy to get to sensors on top of the TC actuator that should be checked anyways.

Also, always a good idea to change out your diff and TC fluids if it hasn't been done in a while. Simply changing the fluids solved my issue.