Diagnosis help on nbsu - Chevy and GMC Duramax Diesel Forum
04.5-05 LLY Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect

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Old 12-10-2012, 07:03 AM   eBay Motors  #1 (permalink)
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Diagnosis help on nbsu

Trying to figure these tranny code to confirm a nbsu failure. Tranny indicator is intermittent and shows the physical signs/clunks of the nbsu problem, but here are the codes with the problem.

P0700- believe this turns of the check engine light
Unk. B1440 - no idea can't figure out
Tcm p0562- again can't find this definition.
Tcm po872- believe this is limp more if my research is correct.

So do these code match up with a faulty nbsu?

Thanks.

The truck is a 04 lly all stock! Not the one in my sig
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Old 12-10-2012, 08:03 AM   eBay Motors  #2 (permalink)
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P0700- refers to a transmission control system malfunction
b1440- power mode master input circut mismatch
Tcm p0562-System voltage low(tcm).transmission control module
Tcm po872-Pressure switch E, usualy means a stuck E shift valve
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Old 12-10-2012, 08:49 AM   eBay Motors  #3 (permalink)
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Quote:
Originally Posted by StealthBoogie View Post
P0700- refers to a transmission control system malfunction
b1440- power mode master input circut mismatch
Tcm p0562-System voltage low(tcm).transmission control module
Tcm po872-Pressure switch E, usualy means a stuck E shift valve
First off thank you! Where is a good place to reference these codes? Is there a list somewhere? I tried Google to get what i got.

Do any of these issue correspond with a failed NBSU switch on the 5 speed Allison?

To me the power mode mismatch and TCM low voltage could correspond with the corrosion issues that the switch usually fails with.

Thanks again for the code definitions!
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2006 2500HD Crew LLY
EFI Live...4" exhaust...Transgo JR...Blocked... EDGE EVO RACE as a monitor
AMSOIL nose to tail
Thanks to ATP Trucks and Husker Diesel.
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