Transfer case control module

Tiny
BLCKLBRTRVR
  • MEMBER
  • 2006 GMC SIERRA
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 270,000 MILES
System had 12.6 volts. I did a volt drop test on my grounds. The transfer case control module ground to chassis volt drop was 11.8 volts. The C pin black on 4 pin harness(black, red, black and org) on TCCV module was unplugged an had 11.6 volts. C pin on harness had crazy numbers in the hundreds

I had 5.06 volts at switch and on pins on TCC module (5v reference and encoder signal).

On harness (unconnected) at encoder motor I had org 12.6v, tan 11.8v, light green/black 0.0v, black/white 12.6v, brown/white 10.6v, red 12.25, black 10.1v. I am unable to get 5 volt references at this end of harness.

My questions are:

Are grounds out of voltage a issue? Do you think 5 volt reference wire light green/black is open somewhere.
Is module trash?
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Monday, December 28th, 2020 AT 5:30 PM

3 Replies

Tiny
ASEMASTER6371
  • EXPERT
Good morning,

The only reading that is not correct is the ground wire. There should be 0 volts on a ground wire. If you have voltage on the ground, it is not grounded at all.

https://www.2carpros.com/articles/how-to-check-wiring

The rest of the readings are okay except your battery is low. It should show 12.6 volts, not 11.6 volts.

I would repair the ground wire and see if it works. Otherwise, I would replace the module.

In The Left Side Of The I/P Behind The Headlamp Switch

https://www.2carpros.com/articles/how-a-car-electrical-system-works

Roy
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Tuesday, December 29th, 2020 AT 6:05 AM
Tiny
BLCKLBRTRVR
  • MEMBER
My battery volt was 12.6 volt the 11.6 volt was at harness connection of encode motor when not to frame.

I get all 5 volt signals at module, just not when harness is plugged in going to encoder motor.
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Tuesday, December 29th, 2020 AT 6:41 AM
Tiny
ASEMASTER6371
  • EXPERT
Okay, but if it is ground, there should be 0 volts on a ground circuit if it is properly grounded.

Roy
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Tuesday, December 29th, 2020 AT 6:46 AM

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