4wheel drive switches...stays in Neutral?

[HSTONKA]

Sometimes I get in my truck, fire it up and the red light stays on for Neutral, and never switches to 4 hi. I can press the 4 hi button and it will stay in 4 hi. But I have also noticed that if I forget to look and I'll be driving and it will still be in Neutral (redlight) and not driving any different at all than if it was in 4 hi. Its out of warranty, any suggestions?

[HummerMann]

This happened on a few '05 and '06 models. There is a thread in here in the technical section in the summer of 2005. As I remember it's a relay that is cheap and easy to have replaced.

[pdsq99f4]

How's your battery?

[HSTONKA]

battery has never been replaced, '05 SUT with 55k on it......

[pdsq99f4]

You may want to have the battery checked out to make sure it is up to par. You could be having a low voltage situation to the tccm when first starting it up causing it to do weird things.

[BUMMER]

I would like to revive this thread. Ive been experiencing the same problem. My TC tends to go from 4HI to The RED NEUTRAL Light on it's own. I would like to resolve this myself before taking it to the dealer. From the info I have gathered these could be some of the fixes but would like to hear from others who have resolved this

1- Replace TCCM Actuator?
2- Replace relay fuse?
3- Replace Encoder motor?
4- Go through all TC drives 25 times?

[HummerJim]

I can't find the old thread on this but I remember something about going from 4Hi into 4 Lo and 4 Hi lock several times to see if it clears things up.

[BUMMER]

Jim, I believe that would be similar to what Ive read by going through 4HI and 4LO 25 times. I don't see how that would work but I will give it a try. The funny thing is when the TC goes into Neutral, the truck seems to drive smoother however my gas mileage only averages 8.9 at best!!