Push button 4WD transfer case won't shift to 4HI/4LO

Supercharged111 said:

My TCCM took a mini dump last year, I reset it by pulling a fuse I think? It's worked since then. Have you tried that? And did I owe you something else?

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GT80 said:

FIXED!!!

I finally got fed up and took the truck to a mechanic. Just as HE was on the verge of giving up he found these two wires chewed through by a rodent. These are directly under the cruise control motor. One is BLU/WHT and one is BLK/WHT. I don't know what these two little wires do but apparently they are critical! Hopefully this helps someone else someday.

EDIT: I looked up the TCCM pinout diagram and if these two wires go to the TCCM, which they probably do, then the BLK/W could either be "4wd front wheel lock telltale feed" or "Transfer case encoder signal return" and the BLU/WHT is "Transfer case position switch encoder signal". That would make sense.

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Dannothemanno said:

I've been having issues kind of like yours in my 97 k1500 push button and so far I've replaced the
Actuator- with electric one
Encoder motor
4x4 button switch
Tc switch
And I think my tccm is good bc I can hear it click when you select a mode it has stored code 1

it's bugging me because I've replaced almost everything but nothing but when I saw this pic it gave me an idea bc I also ended up finding rodent droppings in that same area in my truck. This will give me a good area to start looking at the wiring and hoping my rat ended up chewing one of those wires you showed.

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Schurkey said:

There's a known problem with a snap-ring that fails, then the transfer case doesn't shift properly. MAYBE this is the problem.

Sonnax makes two split-ring repair kits for this, depending on the size of the shaft.
www.sonnax.com/parts/transmission

Transmission Parts Finder | Sonnax

Check out thousands of cutting-edge transmission products for the automotive aftermarket.

www.sonnax.com

Click on "More parts" tab at top right, then "Transfer Case Parts" on the drop-down menu.

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