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Old 11-21-2018, 07:31 AM   #1
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Join Date: May 2015
Location: Clayton NC
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Wiring experts?

Any wiring harness pros out there?

I'm only getting 2.6 volts on the communication wires (3 tan/1 tan with a black stripe) on my 6L90 Trans TCM.
It's stuck in limp mode (3rd gear) and throwing all kinds of trans DIC messages.

I have test hung a known good TCM and it does the same thing.

I traced and cleaned up all of the grounds that I could find.

I have the harness half way pulled out to check for damage, but can't seem to find anything.

Any suggestions or recommendations are welcome!!!

"Only those who will risk going too far can possibly find out how far one can go." - T. S. Eliot

Last edited by theheder; 11-21-2018 at 07:39 AM..
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Old 01-15-2019, 05:33 AM   #2
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Join Date: Apr 2010
Location: Raleigh
Posts: 282
robertmee is actually making some sense.robertmee is actually making some sense.
There appears to be several points of connectors. Something is potentially drawing down the voltage, so I would start disconnecting things to see if the voltage returns.
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