Problem w/ High Lock?

[PARAGON]

Originally Posted by f5fstop

A failed T/case controller controls the encoder motor that engages all the different 4-wheel drive systems on the vehicle. So, if there was a major failure and it did not correctly process the information from the inputs, including the BCM via the class 2 circuit, it could attempt to engage.
It could just change the indicators too without engaging or disengaging.
I'm not saying it is the problem, all I'm saying is it could be a problem, and for a fact, a well-known problem!

Sorry, you mentioned transmission controller originally when I think you meant T-case. That's where I was confused.

I'm betting he's just getting that change of indicator lights and not actual switching in the t-case itself.

[f5fstop]

Originally Posted by PARAGON

Sorry, you mentioned transmission controller originally when I think you meant T-case. That's where I was confused.

I'm betting he's just getting that change of indicator lights and not actual switching in the t-case itself.

Oops, I did (been a bad couple weeks). I also agree, it is probably the changing of the lights, since if the t/case controller did attempt to switch into 4-low while moving and not in neutral, there should be some serious noise from under the vehicle.

[JetEyeNite]

I tried to switch from 4H to 4H lock and then switched to N.
I tried to go into 4L lock and it all worked fine.
I know I didn't hit 4H lock nor 4L lock when I noticed this problem.

So, you guys are saying that I shouldn't worry about this since it is just the indicator light?

[f5fstop]

Originally Posted by JetEyeNite

I tried to switch from 4H to 4H lock and then switched to N.
I tried to go into 4L lock and it all worked fine. TRIED, or you DID go into the different modes?
I know I didn't hit 4H lock nor 4L lock when I noticed this problem.

So, you guys are saying that I shouldn't worry about this since it is just the indicator light?

No, we are saying the t/case controller might be defective or there even could be a bad connection on one of the wires at one of the connectors (T/case or light array).
What I have to agree with is if the controller did put you into 4-wheel low lock, with the vehicle moving and in gear, chances of it going in without making some loud noises is pretty slim.
Did you feel a sudden deceleration when it engaged? If not, it didn't engage. Which means for some reason the light was going On, which means there is a problem somewhere.

[JetEyeNite]

F5FStop,
Thanks for all your help.

It did go into 4Low lock when I tried.
So, I better call my dealer..

[ScottAndDebbieHughes]

Well......2 times today our 03 H2 transfer case setting indicator light went from 4W Hi to N while driving at 30 Mph with no noticeable transition. The first time we just pulled over - put the tranny in Neutral and shifter thr T-case back to 4W Hi. All seemed good. 7 minutes later....same thing. This time followed the manuals instructions for shifting out of T-Case N. Seemes to work. Keeoing fingers crossed.

[lude]

I had this exact problem with my 03 Avalanche when it first happened i never thought anything of it but then it kept doing it as i was driving it would do it and it kept getting worse and it was shifting on its own and terrible noises got it in and cost me about 1200 was the transfer case thank god they say they have the problem fixed in the newer vehicles have not had any trouble with my 07 sut