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Old 08-14-2017, 08:14 PM   #1
Cummins9912v
 
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Exclamation LLY trans issues

Hey guys got an 04.5 duramax. Truck is throwing a p0846 code and stuck in limp mode. Trans is on a fresh rebuild with suncoast converter, clutches, valve body. Put 2 nsbu switches in, I have traced wires to look for breaks, checked continuity in every plug, still nothing, even changed out tcm with another that I knew was good. I am stumped has anyone ever ran into this?
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Wyatt
'99 dodge 12 valve Cummins
northeast 13mm p7100 set at 650cc 36* timing
5x25 dual feed injectors
S468/hx60 compounds
47re full billet, FMVB
Arp head studs
full Port and polish
Hamilton beehive springs
220/240 cam
Extreme duty pushrods

Last edited by Cummins9912v; 08-14-2017 at 08:17 PM.
 
Old 08-14-2017, 10:42 PM   #2
JWhite
 
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I think that's a pressure switch code. Drop the pan, check that along with the internal harness and the main plug at the tail housing.
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Old 08-14-2017, 10:44 PM   #3
Duramaxed
 
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Send it back to the builder. He should know how to fix it.
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Lly built motor, s475, dual pumps, 80 over injectors, built trans.
 
Old 08-14-2017, 10:48 PM   #4
JWhite
 
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Quote:
Originally Posted by Duramaxed View Post
Send it back to the builder. He should know how to fix it.
Good idea. But it probably came with the tail light warranty
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Old 08-15-2017, 08:09 AM   #5
Cummins9912v
 
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I am the builder, every time I take the harness and unplug it, it gives me a different code. So it's starting to make me think it's the harness. But I also replaced it at the same time of rebuild
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Wyatt
'99 dodge 12 valve Cummins
northeast 13mm p7100 set at 650cc 36* timing
5x25 dual feed injectors
S468/hx60 compounds
47re full billet, FMVB
Arp head studs
full Port and polish
Hamilton beehive springs
220/240 cam
Extreme duty pushrods
 
Old 08-15-2017, 08:20 AM   #6
Cummins9912v
 
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I've dropped the pan and cleaned everything, cleaned A&B pressure switch, put a new filter and fluid in and still goes into 2nd as soon as you drop it in drive. But also still has reverse
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Wyatt
'99 dodge 12 valve Cummins
northeast 13mm p7100 set at 650cc 36* timing
5x25 dual feed injectors
S468/hx60 compounds
47re full billet, FMVB
Arp head studs
full Port and polish
Hamilton beehive springs
220/240 cam
Extreme duty pushrods
 
Old 08-15-2017, 10:28 AM   #7
Duramaxed
 
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Stuck e solenoid. You can clean it 50 times and MIGHT get lucky, easy way get another valve body
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Lly built motor, s475, dual pumps, 80 over injectors, built trans.
 
Old 08-15-2017, 10:29 AM   #8
Duramaxed
 
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Why did it need rebuilt in the first place
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Lly built motor, s475, dual pumps, 80 over injectors, built trans.
 
Old 08-15-2017, 10:54 AM   #9
Cummins9912v
 
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The guy has a stupid big tune on a stock trans and it finally bit the dust. He won a free converter of his choice from suncoast last year at UCC so it was going to come out anyway. And yeah I've cleaned the E selenoid a couple times but haven't replaced the valve body yet
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Wyatt
'99 dodge 12 valve Cummins
northeast 13mm p7100 set at 650cc 36* timing
5x25 dual feed injectors
S468/hx60 compounds
47re full billet, FMVB
Arp head studs
full Port and polish
Hamilton beehive springs
220/240 cam
Extreme duty pushrods
 
Old 08-15-2017, 11:58 AM   #10
Duramaxed
 
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I've only gotten lucky a handful of times cleaning the valve body multiple times. Usually just find another one and do your mods to it, put it in and go.
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Lly built motor, s475, dual pumps, 80 over injectors, built trans.
 
Old 08-15-2017, 01:15 PM   #11
JWhite
 
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Quote:
Originally Posted by Cummins9912v View Post
I am the builder, every time I take the harness and unplug it, it gives me a different code. So it's starting to make me think it's the harness. But I also replaced it at the same time of rebuild
I hope you didn't charge him anything.

When you listed the mods in your first post, sounded like you swapped in a SC valve body along with their clutches and converter.
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Old 08-15-2017, 03:11 PM   #12
Cummins9912v
 
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He did get a new valve body but I have since taken it out and cleaned to try and narrow down what this issue is
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Wyatt
'99 dodge 12 valve Cummins
northeast 13mm p7100 set at 650cc 36* timing
5x25 dual feed injectors
S468/hx60 compounds
47re full billet, FMVB
Arp head studs
full Port and polish
Hamilton beehive springs
220/240 cam
Extreme duty pushrods
 
Old 08-15-2017, 04:19 PM   #13
Duramaxed
 
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It's valve body. You got dirt or debri in it. Any little thing will make a valve get hung up. Don't waste any more of your time chasing wiring or other controllers. If it didn't have the issue before then it's something you did.
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Lly built motor, s475, dual pumps, 80 over injectors, built trans.
 
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