Shifts into 4WD on its own

V1800ES

MEMBER
2006 CHEVROLET COLORADO
3.5L
5 CYL
4WD
AUTOMATIC
107,000 MILES

My truck occasionally shift into 4WD on its own. The first time on a sharp left turn. I got these codes from my reader:
U1000 Class 2 Data Link Malfunction
U1026 Loss Of Communication With Automatic Transfer Case Controller
U1064 Lost Communication With Body Control Module (BCM)

3 Replies

KEN L

MASTER CERTIFIED MECHANIC
42,949 POSTS

There is a transfer case control module under the drivers seat that may have got wet or has gone out. here is the location in the diagrams below but we should start by checking the fuses. here is a guide and the fuse locations below:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.

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Saturday, July 27th, 2019 AT 1:07 PM

V1800ES

MEMBER
2 POSTS

Question: If I buy a new TCCM will it need to be programmed? What about a used from the same year?

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Tuesday, August 13th, 2019 AT 9:28 AM

KEN L

MASTER CERTIFIED MECHANIC
42,949 POSTS

It must be plug and play because the instructions on how to replace it does not mention the reprogramming. Check out the diagrams (below). Please let us know what happens.

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