Duramax Diesels Forum Truck of the Week
  #1  
Old 02-19-2018, 01:03 PM
Andrewf Andrewf is offline
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Default Shift Inhibited

My first post on Duramax Diesels. I've been reading almost all day on other posts and suggestions on how to diagnose the shift inhibited issue. I've learned a lot today and thanks to everyone who help others on this forum. I have narrowed my plan of action down to a couple things and I would appreciate it if someone would agree or direct me on a different path. I got the shift inhibited warning and the service engine light on my truck yesterday morning. I got the normal slipping etc. I put the shifter in drive and drove down the road and the transmission would not shift out of 1st gear. I pulled over at the first safe place to do so. I shut the engine off, waited about a minute, restarted the engine and drove off. The transmission shifted like a new truck and it did so all the way home, approx 125 miles with multiple stop/start at stop signs and lights. It drove like a new truck. So, here we go.
1) Does the perfectly shifting transmission indicate nothing wrong internally?
2) Should I lean toward taking the most widely suggested advice and replace the NSBU switch then the ignition switch?
3) Say heck with it and take it in to the dealer?

I used my AutoCal and pulled these codes: P0700,0846,0871,0875

I would appreciate any advice.
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  #2  
Old 02-19-2018, 01:15 PM
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Iím sorry I canít exactly help you with your problem but Iíd like to applaud you for this being your first post. Lots of info. Research already done. Game plan laid out. And exact codes stated. Wish there were more like you lol Welcome and hope it gets fixed for you!
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Old 02-19-2018, 01:23 PM
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I would start with a new NSBU switch. If that doesn't fix it, replace Pressure Switch manifold and internal harness.
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Old 02-19-2018, 01:23 PM
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Thanks, Zach. I think the NSBU switch is a no brainer. Not that expensive and it is 13 years old. I didn't mention the miles on the odometer so I actually didn't give ALL the info. It has 120,000 miles and it does see a lot of garage time too. I have a company car so the truck is more of a garage ornament than anything else. Did I mention that before yesterday, the truck sat in the garage without starting it for two months? I wonder if that could have caused this.... Hmmm.
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Schefenacker/Visiocorp towing mirrors
Cold Air Intake/LBZ Mouthpiece
EFILive DSP5 Autocal Tuning By Kory Willis
Kennedy Twin Lift Pumps, Kennedy MegaFilter
4" Downpipe back Flo~Pro with FTE Resonator
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  #5  
Old 02-19-2018, 01:28 PM
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Hi Mike. I like the NSBU part of your reply. But that internal stuff is scary. I do appreciate the advice. I will post my findings as soon as they are available. DO you have any experience with RockAuto? They have the NSBU for about $50.00

STANDARD MOTOR PRODUCTS NS377 {#29541852} Info
Automatic trans.; 5 speed trans.
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Schefenacker/Visiocorp towing mirrors
Cold Air Intake/LBZ Mouthpiece
EFILive DSP5 Autocal Tuning By Kory Willis
Kennedy Twin Lift Pumps, Kennedy MegaFilter
4" Downpipe back Flo~Pro with FTE Resonator
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Old 02-19-2018, 02:47 PM
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The pressure switch and internal harness are no big deal.
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Old 02-19-2018, 05:20 PM
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I use RockAuto all the time, but their part quality varies (you get what you pay for). I don't know if the Standard Motor Products switch is any good or not.

I do know that Amazon has ACDelco parts for cheaper than RockAuto sometimes, so it is worth looking what the real OEM part would cost there.
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Old 02-19-2018, 05:26 PM
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The 4L60E,4L80E switches are the same as Allison. I think the sealing is better in the Allison switch for bad weather.
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Old 02-20-2018, 05:51 AM
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Thanks to everyone. I have a NSBU switch and an ignition switch ordered. Should be here Friday. I'll post my results.
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Schefenacker/Visiocorp towing mirrors
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EFILive DSP5 Autocal Tuning By Kory Willis
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Old 02-22-2018, 04:25 PM
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WooHoo, almost. I received the new NSBU switch today but it doesn't include any special instructions. Like, should I disconect battery, put the transmission lever in any special position. Stuff like that. Anyone out there have any "oh by the way" tips? I did find one online tutorial on replacing a NSBU but it was for a different year/part number.
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2005 GMC Sierra 2500HD 4X4 LLY
Schefenacker/Visiocorp towing mirrors
Cold Air Intake/LBZ Mouthpiece
EFILive DSP5 Autocal Tuning By Kory Willis
Kennedy Twin Lift Pumps, Kennedy MegaFilter
4" Downpipe back Flo~Pro with FTE Resonator
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Old 02-22-2018, 09:06 PM
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The only difference is most pre 2004.5 are 2 plug and most 2004.5 and up are 1 large plug . You blocks the tires and put in N follow video or posts , very easy as long as you dont move gear out of N ! Buy the slightly more $ NSBU because it has shields on it to help keep out some road crap !
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Old 02-24-2018, 09:34 AM
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How about that! Fixed. The NSBU switch did the trick. Very easy install, too. Now I have to decide if I want to proceed with replacing the ignition switch that I purchased with the NSBU.

Thanks to all who helped with excellent advice.

Andy
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2005 GMC Sierra 2500HD 4X4 LLY
Schefenacker/Visiocorp towing mirrors
Cold Air Intake/LBZ Mouthpiece
EFILive DSP5 Autocal Tuning By Kory Willis
Kennedy Twin Lift Pumps, Kennedy MegaFilter
4" Downpipe back Flo~Pro with FTE Resonator
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Old 02-24-2018, 11:04 AM
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Put the ignition switch in your glove box and save it for if the problem continues
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  #14  
Old 02-24-2018, 11:39 AM
Andrewf Andrewf is offline
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Just completed installing the ignition switch. Might as well, I have it and the old one is 13 years old. Much more work installing the ignition switch than the NSBU. That steering column cowling is a beotch. Ole Blackie is running great again.

Not a single beer was injured during this project....
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2005 GMC Sierra 2500HD 4X4 LLY
Schefenacker/Visiocorp towing mirrors
Cold Air Intake/LBZ Mouthpiece
EFILive DSP5 Autocal Tuning By Kory Willis
Kennedy Twin Lift Pumps, Kennedy MegaFilter
4" Downpipe back Flo~Pro with FTE Resonator
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  #15  
Old 02-24-2018, 12:01 PM
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Great job , Mike hit the nail on the head again , and you did some great research yourself!
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05 CC/LB DRW LLY Allison
AFE Blade Runner,AFE Momentum CAI,DHD Big Air intake Y pipe, DHD fuel block,DHD pcv reroute,MBRP 4 inch exhaust,DHD 3 inch downpipe,BD driver's side manifold,DHD pass side up pipe,DHD 3 inch intercooler hot&cold pipes, ATI damper,Empire pin kit by Big Foot on & off road shop, FASS fuel system,5/8 inch pickup, FASS fuel filter delete, EFI live,V2 & lap top , 5 position switch 250 hp big tune, shimmed fprv by Crank it up , built SunCoast Allison 1078 converter aftermarket trany mount by Limitless Diesel,ARP head studs,grade C gaskets,tig-welded water pump,T stats by Blackout performance,MA t case brace , Kriptonite motor mounts,MA pump rub kit,HD drive shaft 1480joints by Greensburg machine,BDS Recoil traction bars, PPE finned deep pan , Mike L trany cooler, PSC pump, 5100s, Sulastic Shackles, Curt com 2.5 hitch
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