Lost communication to tccm

[Kirkq20]

Lost communication to the transfer case control module in my 14 Silverado 6.2. Previous module failed,  so I went out and bought another one for my dealership to program. They are telling me the wire harness must be bad because the cannot get it to talk.  The harness is on indefinite back order from GM so u decided to look into the harness myself and I cannot find anything wrong with it what do ever.  (I'm an electrician) Any one have any ideas or a wire diagram I could have some hope to try and figure this gremlin out?

[Snowcamo]

Lost communication to the transfer case control module in my 14 Silverado 6.2. Previous module failed,  so I went out and bought another one for my dealership to program. They are telling me the wire harness must be bad because the cannot get it to talk.  The harness is on indefinite back order from GM so u decided to look into the harness myself and I cannot find anything wrong with it what do ever.  (I'm an electrician) Any one have any ideas or a wire diagram I could have some hope to try and figure this gremlin out?

Likely just the pins in the connectors unless the harness has been damaged where you can't see. Prob just a loose connection.

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