16 replies to this topic

[mojave mark]

Just curious if this has ever happened to anyone on the forum. I have a 2008 Sierra 1500 pickup with 4 wheel drive. The four wheel drive is controlled by a dash mounted control that can be set on auto or 2wd or 4 hi or 4lo. I spend most of my time mavigating the wilds of urban so. cal. The system engaged without asking into 4lo and would not disengage. I took it to the local gmc dealer. After 1.5 days of investigating, they said that it was fixed after they "reprogrammed a module" I asked them what should I do if this happens out in the middle of bumbleep. Their response "This is very rare; we've never seen this before" I'm glad they fixed it without charge, but I'm not feeling too good about it not happening again. Any thoughts from the forum?

[chnlisle]

1. You might want to ask them if there's away it can be engaged manually under the truck.
2. Perhaps go to one of the Sierra forums and see if anyone else has had the problem and they know how to engage it manually.
3. Buy a Dodge.

[HERR42]

1. You might want to ask them if there's away it can be engaged manually under the truck.
2. Perhaps go to one of the Sierra forums and see if anyone else has had the problem and they know how to engage it manually.
3. Buy a Dodge.

what an awful thing to tell someone who is asking for comments!

why would anyone buy a damn failure-fiat?

a trusty ford is the solution! ...but no running boards.

[chnlisle]

what an awful thing to tell someone who is asking for comments!

why would anyone buy a damn failure-fiat?

a trusty ford is the solution! ...but no running boards.

Oh Jeff, I am one with my Fiat Ohmmmmmmmmmmmmmmmmm

[DirtyDog]

Don't mind these guys Mark. If they had any useful info at all I'm sure they would share it. I think we just have no idea.

[chnlisle]

Don't mind these guys Mark. If they had any useful info at all I'm sure they would share it. I think we just have no idea.

Hey I resent that.... I think it would be a good idea to see if it can be engaged manually. I was able to to it on my old t100. These things are usually vacuum activated

[DirtyDog]

Hey I resent that.... I think it would be a good idea to see if it can be engaged manually. I was able to to it on my old t100. These things are usually vacuum activated

I stand corrected. That particular part was a good idea

[craig333]

Thats one of the reasons I made sure my truck had the manual stick. There has to be a way to do it manually, whether its practical or not out in the boonies I don't know.

[Bat]

If your really screwed just unbolt the front drive shaft but there has to be a simpler way

[EdoHart]

On the Chevy/GMC electronically controlled transfer case, the problem is usually located at the selector switch. You may have to replace the switch, but before I would do that, I would remove the switch from the dash and clean the contacts with electronic parts cleaner.