I have an 02 2500 and it has banks six gun on it. Trans went into limp mode with no signs of slipping or erattic shifts. pulled codes shift solenoid C, D, E circuit electrical; PO763,768,773. Also has Pressure solenoid C, D, E codes with C being stuck off D being stuck open and E being stuck open too. have replace nsbu due to it was the brown one. Found TCM not suppling 12v reference to trans replaced TCM had reference. Still same problem.... next day went to check at trans connector had no voltage.... double checked tcm found no reference at tcm.... banks is off before any work was done? any help would be excellent i also am wondering why the banks has wires going to tcm?

Thanks Devious Diesel Performance.

Any help or knowledge would be greatly appreciated!

When there are electrical codes the TCM will stop providing the high side reference as a response to the DTC.

Sounds to me like you might have an issue with your internal harness or the passthrough connector if you have pressure switches showing stuck off and solenoids showing open circuits.

Well when i was checking for ref voltage at trans pass thru, it had fluid in it like the pins are leaking. Surely to gosh that wouldn't be causing it? Could be wrong i'll clean tommorrow and check. Thanks for your input.:confused:

Are you getting good 12V at the TCM pins #2 and #4 of the Gray connector? If not it could be a faulty ign switch. Also check for good ground on pins #1 and #5

i had battery voltage and ground checking with power probe 3 will check with dvom though thanks for your help.

FIXED! truck had a solid 12.68V on the reference circuit from pin 31 Brown wire at the tcm but had a 10.80V voltage loss to pin C of the trans connector. Rewired the circuit, cleared the codes and she's shifting great!!!
Pleasure doing business again Greg!