Need Help! Hummer gone nuts!

[ROUSHDEMON]

So I tried doing some research on this and I'm not the only one who has had this problem. But it's really weird.

Mainly started happening when I hit a big bump a few days ago, like a big one........ EVerything works fine mechanically, but my electrical has taken over the truck and it's going nuts. It comes and goes but now I can't get it to go normal long enough to get it out of 4LO.

Here is a thread I found that the guy had exatly the problem i'm having but never got a result out of it.

Has anybody had the same problem? heard of it?

http://www.elcovaforums.com/forums/s...t=acting+weird

This is the description of the issue I'm having:

It shows on the dash "unknown driver" and the ABS,CHECK ENGINE,BRAKE,TRACTION CONTROL,OIL,BATTERY and the SECURITY comes on. ALL THE GAUGES SHOW ZERO, And later after the UNKNOWN DRIVER the dash shows SERVICE AWD.And whatever is on on the car like the A/C and the RADIO turns off.The windows and the lock becomes inoperative so i cant open or close windows or doors.
But the car works fine with no problem..I CANNOT switch gears and switch between the 4wd gears.
If i turn on and off the car everything goes away and back to normal until it happens again...a few seconds later
But after i turn on and off sometimes the SECURITY lights come on and stays on until i turn the car off and open the doors.


HELP!

[STL Zombie Hunter]

Mine had similar issues, but not to the extent of your possessed beast. A lot of the issue lies in the instrument cluster. Those in the 03-06 (I believe, maybe up to 05) use the same cluster as in the Escalades & Denalis. These clusters have MUCHO issues.
I still need to replace mine, as my speedo now reads 0mph at all times. It used to come on and go off whenever it felt like it. Sometimes it would stay off for an hour while driving.

I was priced a rebuilt one through a local GM dealer for $275. But I have still yet to change mine.

[PaHumBug]

Yikes. I hate computer problems. I know when I'm tuning my truck and the computer resets the gauges go to zero and it says "service awd" and all kinds of lights flash. I hope my truck doesn't catch that bug.

[ROUSHDEMON]

here is what it looks like after it says "Unknown Driver"

[STL Zombie Hunter]

Your truck isn't named KITT & talks to you by chance, does it?

[ROUSHDEMON]

Well right now it's being a KUNT, so I dont know if that counts.... lol

[Easy Ed]

My dash will look the same as what you have when I use the programmer. Unknown driver, service 4WD and the other lights, I will hear a couple click sounds from under the hood and also a "hiss" noise until it is finished.

Because of seeing that while messing with the program I guess I am thinking maybe a possible ECM or PCM (what ever it is called) problem has developed in your case ??

Hope ya figure it out, Ed

[SummitUp]

Originally Posted by ROUSHDEMON

here is what it looks like after it says "Unknown Driver"

ROUSHDEMON, it would be great if you would post a pic of your dash displaying that "Unknown Driver" message. Classic! Doubt if we'll ever get a chance to see that message!

[/quote]

[Easy Ed]

My Unknown Driver using programmer...

[ROUSHDEMON]

You so cleeeeeeannnnnnnn lol

[Ken Bowers]

Make sure your battery is fully charged, and disconnect the On Star (remove fuse "Info").

[HummerJim]

I too have electrical gremlins in my 2006. The only aftermarket electrical item is a backup camera dealer installed when new that displays on the nav panel. I'll be driving along and the red OnStar light will come on, or the red neutral light under the 4 W drive buttons will come on (even though the buttons have been replaced), the lights come on during the day and the nav panel turns to night black, or I'll get in the Hummer and the clock has lost two hours, but it starts right up. Then once in a while the battery will go dead if it sits two days, so I just keep it on the battery tender in the garage now.

[ROUSHDEMON]

That's crazy, Twilight Zone for sure.

So, more crazy stuff for me...... I was able to get it out of 4LO/Lock to normal 4HI..... then decided to f*k it..... If I pinched a wire while offroading and hitting a big dip I might UNpinch it by going again. So I did lol

Aaaaaaaaand so far it worked!!..... its crazy, I went and play with some mud.... went in deep water half way through my doors, I jumped a few bumps and vuaallaahh..... Lights are gone since Saturday and have not come back at all............. it's so freaking weird. I guess whatever was grounding that power block is back to it's place, I have no idea how it fixed itself

[HummerMann]

Great pictures.

[Thumper]

Am no expert but IMHO it may very well be a sensor wire that has come lose behind the dash as a result of the sudden shock when you bottomed out. It will cost you a couple of grand to locate it and reattach it. Basically your