4wd Problems

[salden77]

drive strate line then stop and put it on reverse drive in reverse for 20-40 yards and it will disengage

 

i have been told to do this exact procedure every time i take it out of 4wd to make sure it disengages, stop take it out of 4wd, put it in reverse, go back a few feet and it seems to work every time for me so far

[salden77]

also have never had a problem taking my truck outta 4wd and i have a floor shifter instead of the electronic 4wd. sometimes its harder to push the shifter out but i have never been stuck in 4wd.

[CopperZ71]

I'm digging up an old three as I just had the same problem occur. While checking to make sure my 4wd worked properly, I switched it to 4wd auto and the the 4wd service light came on. It would not switch back to 2hi nor could I hear it trying to.

 

From the sounds of this thread, the issues could 1) dash switch 2) encoder motor/senor 3) TCCM.

 

I was able to get it to switch back into 2hi (i never heard it actually switch though) by unhooking negative terminal, waiting 5 mins, hooking back up, starting truck and immediately pulling the fuse. The service light did not come back on. Drove a few times around the block and it seems to be fine. When I restarted the truck, the service 4wd light came back on, but at least it is still in 2wd. The lights on the dash switch are still off, which I assume have to do with the fuse being pulled.

 

Do any of these additional facts help narrow down the problem?

 

Thanks!

[gmtech4]

nope ,,,you have a code to be diagnosed ,,,,,

 

get it scanned and reply with it ,,,,,no shot gun repairs plse

[CopperZ71]

I stopped by advanced auto and there were no codes being thrown. Do all three parts throw separate codes?

[gmtech4]

no ,one causes lights out ,no shifting etc

 

you have a code ,the scanner cant read them ,,,its a POS,,,get it scanned with a real scanner

[CopperZ71]

The code is u1026

[gmtech4]

thats a communication code or lack of comms code ,,,,,,get a service manual ,check fuses

 

good luck,,,you're gonna need it

[CopperZ71]

Thank you for your help. When I had the code pulled, the ATC fuse was pulled. If I put the fuse back, it switches back to 4wd. Could the lack of fuse be the reason for the code? Should I have the code pulled while the fuse is in?

 

Thanks again!

[gmtech4]

yes and yes

[BrassMonkey]

I'm seeing a similar situation w/my truck except every so often, the DIC would throw a "Service 4-Wheel Drive" alert, and then nothing. I haven't switched it to 4WDin well over a year, though.

[gmtech4]

I'm seeing a similar situation w/my truck except every so often, the DIC would throw a "Service 4-Wheel Drive" alert, and then nothing. I haven't switched it to 4WDin well over a year, though.

see post #35

[BrassMonkey]

see post #35

 

That was easy. Thanks!

[gmtech4]

if i saw you were a sabres fan before ,,i would ,,,,,,sry ,,,you're welcome !!!

 

go leafs go !!!!!

[BrassMonkey]

Haha love the rivalry! I still think the Sabres-Leafs rivalry is one of the biggest, but least known, in the NHL. It helps when we're both on opposite ends of the QEW!