Bad nsbu switch duramax. It's pretty easy though, set it and try starting the truck.

Bad nsbu switch duramax Check the connection at the NSBU switch and the trans harness. Jan 25, 2022 #2 Anyone have any ideas? I have 12v at both pink wires going to the NSBU switch with the key on but no power Also installed a new white NSBU switch. but i dont know how safe that Could the NSBU be bad again? Any advice is appreciated, Ed . i read it with my pocket scanner and it said transmission control malfunction?? im having signs of a bad nsbu switch. 5-2005 2005 Chevy 2500HD Duramax LLY BANKS ram air intake, MBRP 4" exhaust, CAT DELETE and NO MUFFLER, EGR Deleted, Fisher SS ExtremeV plow, Auto Meter Gauges, Boost, Pyro, All your issues are from a bad NSBU switch, In short, the tcm dose not know what gear its suposed to be in, Finally talked to a friend that has been building transmissions for 27 years. ATF is The NSBU switch is attached to the left side of the trans and is exposed to the road elements, and probably damaged by the contact, or a connector came unplugged. When I check the voltage from the ignition using a scanner, it appears that the voltage is not dropping. Features: Factory Fit & Finish; Made to Stringent Specifications The NSBU switch mounts directly onto the transmission housing, from the outside, and detects the angular position of the shift selector shaft. . Replaced with a new switch and for the first time since the problem I drove more than 30 minutes with no issues (170 The problem your describing sounds like a bad NSBU switch. 2L & 6. Low fluid-- water in the NSBU switch-- just a guessing game without the codes. The Allison 29540479 NSBU (Neutral Start Back Up) Switch is an OEM replacement for the faulty NSBU switch in your 2001-2004 GM 6. 5-2005 (LLY) 6. BTW A forum community dedicated to Chevy and GMC Duramax diesel owners and enthusiasts. When the problem occurred the white wire would barely light a test light. 1. and I only got the highlight behind the selector for a second. Save: 8%. p0700 p0843 p0870 Po875 Thanks to the help of Larry at Danville performance and Mike L we determined it was a combo of a bad nsbu switch and junk in the valve body. Save: $19. Reinstall the switch. If the connectors are secure, you MAY have a bad NSBU. Check out the deal on Duramax 06-19 Allison 29542692 NSBU (Neutral Start Back Up) Switch at Full Force Diesel. Hope this helps! Chevy 04. In the morning when cold, no reverse and will only go into reverse for like six seconds solid, then gone. Still no power out of it though, Turns out the yellow wire coming out of the NSBU at the connector was broken. Scanner shows P0700 and P1571 codes. NSBU switch. But not sure. 5L Diesel Engine Duramax First Generation: 2001-2004 (LB7) Duramax Second Generation: 2004. That code is for high voltage-- Have you jump started anyone-? Chevy 04. 4065 posts · Joined 2006 Add to quote; Only Chevy / GMC Duramax 04. Ramblinrodney. The PNP switch, as referenced in SI, is known as the NSBU switch in the Parts information. Once the truck warms up, I switch the key off, and turn truck back on, and I have reverse for what seems like the rest of the day. Replaced ignition switch and all is good. Continue Not saying you will have the issue but with my LB7, my NSBU switch went bad. 6L Duramax, fixed my truck. The NSBU is subject to water contamination and will allow the switch to give faulty readings How much was the NSBU switch compared to the dealer diag fee? Even though your brake lights still work the brake switch still can be faulty. Qty: Add to Cart Add to Wishlist. The truck is a stock 2002 duramax 4x4 CC auto with an Allison What else can i try or check? Please help!!! Chevy / GMC Duramax 01-04. then STOP, and try this next. I would look at your nsbu switch, they are known for going bad. and yes, you need to "clock" the switch to set it up properly. Have the shift to "N" when you install the new switch, and it will be indexed correctly. 5 LB7 Forums. Chevy and GMC Duramax Diesel Forum. Although I am very experienced with Duramax, we have a 2001, 2003, early and late 2004, a 2008, and a 2017 that I maintain, I was beating my head against the wall. I replaced the nsbu switch and have adjusted it but sometimes when I put the shifter in park it seems like it needs to go just a little bit further to push A forum community dedicated to Chevy and GMC Duramax diesel owners and enthusiasts. The internal and external filters were replaced, and new fluid was added (about 9 quarts). Save Share Customer: I have a customer with a 03 duramax 2500 hd. Replacing the switch fixed my problems. I replaced the NSBU switch about 5 years ago. It's pretty easy though, set it and try starting the truck. Issues continued over the coarse of 12 months and started coming more frequent. Yes, most likely the NSBU switch is the problem. My 2003 GMC 2500 HD Duramax is doing the same thing. 2005 2500 Chevrolet HD Duramax 6. 5-2005 GM 6. That is the NSBU switch inside the trans pan. This is a known problem for the 2001-2003 Allison AT's. Haven't moved the truck in two weeks, but when I tried yesterday morning, the truck refused to go into reverse. 2007 Duramax 4x4 crew Cab S/B Stock. remove the 2 bolts that attach the NSBU switch (the front driveshaft will get in the way a bit but you should be able to access the bolt with the socket) and pull off the old NSBU switch. 32. com tow tune w/turbo brake PPE Dual Fueler (P0087 cure) Kitty on a "warm shelf", K+N Drop-in filter You could have a loose connector or even a bad NSBU switch. SzymoDmax. ensures easy starting in park or neutral, and long-lasting reliability. 1 of 2 Go to page. Jump to Latest 3. BamBam New Member. JRODCHOPPER Discussion starter 2 posts If +12V present when in RUN/START, most likely bad electrical contact E-G on NSBU switch. Next Last. 5-2005 No way that it will effect an older Allison which this guy has if he is changing an NSBU switch externally. Now it's ok to remove the metal clip from the NSBU housing. NSBU Switch or Ignition Swith? but also I know my ignition switch is bad because anytime the door is open the dinger keeps going off weather the key is in or not. What does everyone else think? 2008 LMM CCSB 2500HD 4x4 Chevy and GMC Duramax Diesel Forum. If you click one of the links in my sig, there is an album with pics of the NSBU switch. - PRNDL display may not show up I reinstalled the original black switch and still have the same issue. Jump to Latest Or the nsbu stitch I got, maybe it's bad? It was in the box from a buddy but maybe it's bad? Sent from my SM-G925V using Tapatalk . possible nsbu switch going bad or poor connection '05 GMC 2500HD (white) slt cc sb 4x4 efi-tuned by idahorob, egr blocked, pcv rerouted, lift pump, kodiac mp,autometer sportcomp gauges, turbo dp, 4" ss magna flow Back on subject, here is an excellent writeup I found on how to change the NSBU switch by jedmax can't really say it better than this: 1. After browsing this forum looking for a possible fix, I found so many possible issues that I didnt know where to start except changing my transmission oil and both filters and examining the NSBU switch and wiring inside of the transmission oil pan cover since I 04 lb7 Allison 1000. This could also be the pressure switch being is loose on the valve body,or a bad internal wiring harness, or the switch itself "though unlikely" could be the cause. Started it up and reverse engages. Randomly returns after deleting, always after long term parking. 5 LB7 Duramax Powertrain NSBU switch question I was under my truck tonight and found a broken wire running to the NSBU switch. Doing some needed service to the Duramax! Oil Change, NSBU Switch Install and Interior Allison Transmission Electrical Harness Install. J. 6L guru mechanics needed. A forum community dedicated to Chevy and GMC Duramax diesel owners and enthusiasts. After guys said it was the tranny pressure switch, so I pulled the pan and noticed one bolt in the switch was completely unthreaded. I have to replace the neutral safety switch on my 2011 chevrolet 3500 4wd duramax! Where is the switch located inside of the transmission do i have to take Pressure switch manifold bad? Ignition switch It was the 01-early 03 when GM slapped on there cheaper NSBU to the side of the ALLISON instead of ALLISON's better Of course it can be either one on an early Duramax-- as they both cause problems. Cab Long Bed 4x4 LBZ Duramax/Allison SRW. Jan 14, 2009 280 0 0 F U im from TEXAS. Although this morning when he went out to replace the switch he tried to start his pickup and it was dead. 2L Diesel Engine Suspension & Steering - 2001 - 2010. 6L Duramax LB7. Aug 30, 2010 350 0 0 Manitoba Duramaxdiesels. 2010 3500 4 door long box EFI live 5 tunes of rubber shredding happiness. 5 LB7 Duramax Powertrain NSBU Switch. 0 out of 5 stars Bad product, Bad Seller and Amazon is useless Reviewed in the United States on March 10, 2020 The 2006 to 2015 GM Duramax diesel are prone to Allison TCM failure issues. The switch is not sealed properly and allows water to corrode the wiring. Jump to Latest 1. Modified 2002 Chev 2500HD Dmax/Allison X-Cab LB 4WD, B&W Goose Hitch with Companion 5th Wheel, Duramax. The most common issue is U0101 “loss of communication to the transmission control module”. If it doen't start by jumping the solenoid-- you have a bad starter. Visually things looked fine. Did you find a bad wire , pin, harness, valve? I have a 2002 2500HD Allison LB7 185000km (124k Miles) Trans cooler, trans service oil, filter done less than 50k miles ago. Weird how it was throwing random codes but now the truck is all good with The NSBU switch is very important on a 5 speed and if worn/shorted/water, it can and will affect the trans operation. Then back in Oct it would take multiple key cycles for it to work again. If it starts OK,you may have a bad ignition switch or a bad NSBU switch. 2001 gmc dually 3500. The NSBU switch sends information to the TCM, which it then selects a gear inn the trans. Jump to Latest that the shift selector light only came on sometimes so did some searching and most people were leaning towards a bad NSBU switch, so I went to GM and bought a new one and installed it, What are some of the symptoms that the NSBU switch is going bad? - following DIC codes MAY suggest the NSBU as the culprit: P0700, P0708, P0847, P0872, P0875, P1711 and P1713. It wont go into gear and now it wont even start. It could be bad again, but it sounds like a TCM problem. The NSBU switch is known to fail, leading to issues like: no start condition, DTCs for the pressure switch, fail safe mode and incorrect gear showing on display. 6L LB7 Duramax; 2004. Installed it, and it did nothing. 5 LB7 Duramax Powertrain New Member Introductions Build Threads Exterior. 8M posts 221K members The NSBU switch mounts directly onto the transmission housing, The NSBU is subject to water contamination and will allow the switch to give faulty readings. It happens on those black switches. - Sets DIC codes MAY suggest the NSBU as the cause: P0700, P0708, P0847, P0872, P0875, P1711 and P1713. 5L Non-Duramax; 2001-2004 GM 6. This may be caused by low fluid level, valve body problems, a faulty pressure switch manifold, Ok so I need help I have a 2005 gmc sierra 2500 hd LLY 6. Top Contributors this Month View All. I am leaning towards a ignition 03 chev 2500 4 door long box Duramax Could be a NSBU switch-- that will affect the reverse and shifting-- and may also cause the TCC problem. 6 duramax drove once since I replaced with grade C gm head gaskets, arp head Switch the multimeter to ohms and set the range to 200; Use the black pin from the multimeter to touch the negative battery terminal. 5-05 LLY Forum. Also, the TCM will keep the transmission in neutral. Traced all electrical lines from the connectors to the Allison TCM. R. Is it possible I have the 4 pin connector wired wrong or a bad NSBU? Is their any way to test the NSBU NSBU: "Neutral Start Back Up" switch. You can simply drill the rivet, clean it out an, re grease with dielectric and reassemble. LMMGroceryGetter New member. Symptoms of a bad NSBU switch - No Start condition. 2004 CCSB 4x4 LB7 Duramax SAC45 Injectors from LDS, S369SXE, uppipes, manifolds, Mike L trans, SuperSport CP3, custom intake, Danville EFI LIVE, Fass Lift Pump, 5" MBRP Straight Pipe, Edge CTS3, lots of other junk. Cheap code readers DO NOT READ trans codes. 5. 6 Technical. nsbu switch. It's an easy change out. Checked all the fuses. Me thinks it’s time to check your NSBU Switch Start simple, go from there Also check battery voltage (and each battery to check for bad one), fluid levels, etc. Another possibility is a bad ignition switch-- many have had problems with this part. 974 posts Maybe bad NSBU switch? Any codes? REDHOSS02 hard n heavy. Allison 1000 6 Speed NSBU Switch, LBZ LMM LML L5P, 2006-2019 Duramax - 29542692 at Dans Diesel Buy Monthly Payments, As Allison 1000 6 Speed NSBU Switch, LBZ LMM LML L5P, 2006-2019 Duramax - 29542692 Was: $227. I had absolutely no issues with my NSBU switch until yesterday. Click to expand Duramaxdiesels. the NSBU switch does not appear to be communicating anything. I replaced the NSBU switch with the updated tan switch brand new from the local Allison dealer (Rush Truck Center) at the cost of $51 including tax. The neutral signal output of the NSBU switch is typically used as confirmation that the transmission is in NEUTRALor PARK before the engine starter is engaged. The multimeter should read between 12 and 25. Was: $176. Come join the discussion about modifications, towing, classifieds, troubleshooting It almost seems as if your TCM is not communicating with the tranny, and it's confused. The NSBU switch transmits selector position Converters, Clutches, & Drivetrain | 2001 Batteries are new but connections were very bad, cleaned them up and it cranks perfect now but still does not fire. Symptoms of a bad I looked it up and it said my nsbu switch was bad. The batteries are only a year I was having problems with my transmission and one day I went to get in it and it said "shift inhibited return to neutral to reset" and after doing some rese The other day my instrument cluster read range shift inhibited. With the engine light on, cycling the ignition wouldn't work. Test the plug you plugged out by touching the tab with the red pin from the multimeter. It is possible that you have a bad NSBU switch- That is a common display when they short. NSBU switch for my Allison 1000, 2004 Chevy 2500HD 6. It would not unlock my doors when putting in park, my ignition switch was acting funny, all sorts of weird sh*t. Results above or below this show that the solenoids are bad. I pulled the column and checked voltage at the ignition switch, it was 11. Although it didn't fix the issue, I did note corrosion on the electrodes in the connectors so probably was bad. 5-05 LLY . Item Inquiry Tell a Friend. Go. That closes the starter relay and then power is sent to the starter relay terminal-via the 40 amp "A" fuse. 2001 duramax. Sort by Oldest first Oldest first Newest first Most reactions. But doesn’t it use Auto Trac, no just ½ tons. B. Possible a bad NSBU switch-- the system works like this-- Key switch sends power to the 10 amp crank fuse in the left fuse box-- then to the purple/white white to NSBU switch-- leave the NSBU to the start relay. A lot of people seem to have problems with the aftermarket "OEM" replacement NSBU switches too. Keep a new NSBU handy as a testing tool. * Took truck for test drive. Ron Nielson 218 Replies. It started with no shift display, no gears, or only 1st and 2nd. May 18, 2011 #3 Dealer diagnosed a P0875 and said it was a NSBU switch. Everything was good again. - PRNDL display may not show up or flash. may wanna look into it. I looked it up and it said my nsbu switch was bad. Ideal for maintaining a factory ride, this part has a stock fit and finish. No worries after having wrongly diagnosed and changed bad NSBU switch inside tranny. You may also have a cable problem-- disconnect the cable from the Allison shift lever and see if it still binds when shifting. There'll be some resistance when you pull it off. 5 LB7 Duramax Powertrain Torque converter lock up issue. Had a bad nsbu switch got new one from xdp. GM issued a TSB on this problem, and even though my truck is past warranty the dealers replaced the switch as a courtesy warranty. or could be as simple as a bad NSBU switch of course if you are running a The metal clip (neutral assurance bracket) on the switch helps to ensure the switch is properly aligned to the shaft. While searching for a solution online, I found the part cannon method, which involves replacing the NSBU switch or ignition due to low voltage. Location: The switch is located on driver's side of the Allison transmission. Sold to Dad> 2001 Chevrolet 2500HD 4x4, Crew Cab, LB, LT, LB7-Duramax Diesel/Allison 1000 Series, Autometer Boost/EGT I went ahead and got an nsbu switch but I don't want to put it on unless y'all think that's what it could be. Parked the truck and let it get back to cold. FYI if you are missing the alignment tool for the NSBU, you can still install it. 2021 GMC Sierra 3500HD Denali Lomax Diamond Mist Tonneau SOLD 2016 GMC Sierra 2500HD Denali 2003 duramax recently trans started throwing p0875 code and was getting range shift inhibited message- trans only has 3rd neutral park and reverse. I think we talked about the NSBU switch causing no signal to go to the starter. Worked great. Studs, M. All of a sudden, it seems like I hear about people having issues because of the rain/snow. Then it progressed to check I removed the NSBU and set it to nuetral with the little metal thingy and checked continuity and it checked out okay (I'd hve been pissed if the brand spankin new switch was bad. Save Share Bad NSBU Switch? Dave 2003 GMC Sierra 2500HD 4 door, short bed, LB7 I read this about a NSBU Symptoms of a bad NSBU switch - No Start condition. Todd 2005 Chevy Silverado 2500 LLY CCSB Chevy and GMC 2010 Chevy Duramax diesel cutaway retired shuttle bus Could this also be a symptom of a bad NSBU switch. * All gears were available and no warning lights. It is doing the same thing that it was before all this work was performed, which is starts and idles fine, but when placed in D, after about 3 seconds, shifts violently hard into default 3rd gear and sets p0700 in ECM, P0872 in TCM. Just takes a little bit of playing around sometimes to get it lined up. 5 LLY, 2X, shell, XDR, MikeL Heavy duty up-grade, 6spd, TransGo, deep pan, de-badged, 65 Gallon replacement Aero tank, Chevy and GMC Duramax Diesel Forum. Plus a little sneak a Did you find a bad wire , pin, harness, valve? I have a 2002 2500HD Allison LB7 185000km (124k Miles) Trans cooler, trans service flush oil, filter done less than 50k miles ago. 2009 LMM Duramax - 6" Fabtech - 37's Nitto Trail Grapplers - FASS 150 - EFI Live - S&B intake - The NSBU switch is on the inside of the 6-speed Allison transmissions. Same message and won't stay in reverse after shifting. High Flow Intake Manifolds 2001-2010 Duramax Diesel Up to 150% more airflow and over Today was the worst it's ever been. 6. Might also check your shift cable. bully dog 2011 Denali Hd 10 inch cst lift on 24's with 37's, H&S deleted. Chevy and GMC Duramax Diesel duramax won't start. It's a 2003 by the way. 2009 LMM Duramax - 6" Fabtech - 37's Nitto Trail Grapplers - FASS 150 - EFI Live - S&B intake - Resonator delete . I remember replacing a faulty switch under the dash 3 years ago which was causing very similar conditions as a bad nsbu. I changed my NSBU switch a couple of months ago due to "shift range inhibited" message issues. 4K members Since 2005 Vtec: all of the lag, with none of the power, its like waiting for bad sex! 2003 2500HD duramax diesel LB7, ext cab short box, efi live, afe intake, 4" MBRP straight piped (more info in garage) Save Share when i put the new nsbu switch on, at Bad NSBU switch . Out of driveway, 300 yards, shifted to second, maybe third gear. i would imagine that you could somehow replace the one inside the trans with one from a manual truck that would be usually located on the clutch pedal and maybe wire it into the column shifting mechanism. Features: Dual Connector Switch; All sensors replaced and NSBU switch. rwood64083 189 Replies. SKU: 29540479 ; Item #: 29540479 ; Brand It sounds like the NSBU switch is going bad. * Changed out Ignition Switch * Truck started, Check engine light went off. Sounds like of you didn't have bad luck you would have no luck at all. Replaced and refilled with fluid to almost the top of the full cold mark. Moisture can get into them and screw them up. The new improved switch is water tight to prevent re-occcurance. GM Mechanic: GM Tech (Cam) No, this test is at the ignition switch not the nsbu. Of course the speed sensor will also cause problems. 6L Stock thinking the old NSBU switch was bad and oil soaked I replaced it (nsbu is single plug). Come join the discussion about modifications, towing, classifieds, troubleshooting, maintenance, and more! Show Less . 6L LLY Duramax; 2006-2007 GM 6. Would the switch make the trans go into gear hard at first start up. If you have a Android phone-- [does not need to be active] you can buy a Bluetooth OBDII adapter [$15], and down load Torque Pro-[$5]. there is no "code" for a bad NSBU, which on the 2006+ models is called the "internal mode switch" 6. It's not that expensive either. 9. So are you thinking bad nsbu switch. com was founded in 2006 and created a site which houses some of the best known Duramax tech you can find. Made to stock specifications, this product is constructed from quality materials. Save Share Not sure if a faulty nsbu switch could cause that. com was founded in 2006 and created a site which houses some of the best known Duramax tech you . Injectors and HP fuel lines from Lincoln diesel at 113K. Picked up an overpriced replacement at O’Reilly (Wells). 5" diamond eye exhaust and AEM CAI. And it's close to the full line at 7. 4" SS turbo back. Dropped Pan and changed spin on and internal filters. Chevy 04. It also threw additional codes: P0700, P0751 Next I've found suggestions to be the NSBU switch, but on 06+ it is internal and not as prone to problems as the 05-older versions. No bad wiring. Slid the black splash shield onto the NSBU switch so that it fits securely against the switch. Check the trans connectors first-- if everything is connected, replace the NSBU switch. EGR Deleted Chances are you could have a bad NSBU switch (on the side of the tranny). 93. For the geeks out there, the bolts should be tightened to 18-21 lb ft. A loose connector, or a broken/shorted wire will cause the same problem. C5500 duramax 6. I then cleaned the transmission My 2002 Duramax is having issues I'm wondering what are the symptoms of the NSBU switch failing?? I've googled it and it seems to be what the issue is I think that my NSBU switch is crapping out. Dec 25, 2012 27 0 0 Duramaxdiesels. 4 quarts. As noted-- the P0700 just turns on the fault light-- then there is always another code/s. Easy check-- use a 12 volt test light -- see if one of the start relay terminals is activated when the truck is in park/neutral. I hope my experience 02 duramax nsbu switch? For 40 it wouldn't be a bad idea to get two and keep one in the truck or garage. HoytBows Member. swapped NSBU, now is throwing code directly related to NSBU, trans range sensor. The batteries are only a year I am not for sure, but it seems to me that to replace the neutral safety switch on the allison, the valve body needs to be removed. I've also found the TCM I drove it longer and the engine light came on at 174 degrees. Mike L's Is it possible I have the 4 pin connector wired wrong or a bad NSBU? Is their any way to test the NSBU switch with a multimeter? Jsle131 New member. 2001 crew dually 4x4 dmax 4 inch straight painted MBRP with turn down turbo mouthpiece mod air box mod autometer sport comp digitals Nsbu switch. Replaced the switch and same problem. The pu started fine but would not move when he put it in gear so that is the reason he replaced the switch. 75v. You turn the ignition switch to start-that sends power to the 10 amp crank fuse [left dash fuse box] to power to the purple/w wire to the NSBU switch at the trans-- and then up to the under hood starter relay. Local garage scanned it as well with their Snap-on scanner and retrieved same codes. - PRNDL display may not show up Does this sound like a bad NSBU switch? Is this a neutral safety back up switch problem: Immediately after my transfer case was remaned, I began having problems with I got the truck as a crank no start, and the old owner said it was the nsbu switch. 6L LBZ the above mentioned trouble codes may set. Upgrade with the Allison 29542692 NSBU Switch for your 2006-2019 Silverado/Sierra. It has worked fine until recently and the same issues have started again. Your Cart (0) Your Cart is Empty. 5 LB7 Duramax Powertrain. 2115 posts · Joined 2009 Add to quote; Only show this user #8 Chevy and GMC Duramax Diesel Forum. Details. without the answers to some of these questions, it is hard to answer what the problem is. AKA PNP ("Park Neutral Position") switch. It seems like once the factory one goes, you end up replacing it quite often. General Discussions 01-04. all of these wires are on the top plug. If it happens again/repeatedly I would start with the NSBU switch, which is located on the side of your trans, cheap and easy to replace. SKU: 29540479 . 2006 chevrolet silverado 2500hd duramax 4x4 lt. Chevy / GMC Duramax 01-04. 3. Customer: My Son just replaced the NSBU swicth on his 2003 gmc duramax with the allison transmission. #duramax #chevy #diesel Keywords: fix range shift inhibited, Allison transmission, gear pos sensor, shift inhibit, reset nsbu Hello all. Possible NSBU problem. S. How bad was the dint well the front diff is busted in half. 8M posts 218. thanks . May 20, 2010 2,895 0 0 41 Springfield IL. What are some of the symptoms that the NSBU switch is going bad? - following DIC codes MAY suggest the NSBU as the culprit: P0700, P0708, P0847, P0872, A forum community dedicated to Chevy and GMC Duramax diesel owners and enthusiasts. Thread starter BamBam; Start date Apr 6, 2015; 1; 2; Next. Its purpose is to block any attempt to start the vehicle from any gear other than neutral or park. 04. Fits: 2001-2004 GM/Duramax LB7. Mounted on the transmission housing, the NSBU switch provides ok. the updated switch should be sealed The security light is flashing, when I use the key fob to lock the truck, it locks, but the horn will not sound. Now I have read that dropping the pan and internal filter should require 12 quarts of fluid. Two plugs into the NSBU switch, thats it. Merchant has the updated beige ones in stock. That was Chevy / GMC Duramax 01-04. 8M posts 221K members Tried the new NSBU switch. If its the output speed sensor (on the tcase or It's funny, when I got this truck, I didn't hear anything abbout the NSBU switch. When I replaced the TCM and valve body I went ahead and bought Duramax Tuners 5-6 speed upgrade. snowman Evil Diesel Performance. 7K It seems as though most of you that are having problems with the NSBU switch, are having the PRNDL indicator on the DIC flashing. I replaced the NSBU switch and ignition switch. 2005 GMC SIERRA SLE 4X4 LLY DURAMAX CC/SB Nictane Filter, Dual Kennedy Lft Pumps,EGR Blocked, MBRP Downpipe Back 4", N-FAB Full the NSBU switches are failure prone there is a lot of road spray coming from the left front tire on turns. You either have no signal at the switch or a short to ground at one of the wires. A bad NSBU switch (Neutral Start Back Up Switch) – Tried looking on the driver’s side of my tranny and found where it should go but it appears I don’t have one. Add items to get started. Havent lots of problems and cant find a solution yet. Duramax 6. 01-04. Feb 15 Duramaxdiesels. Test the Range Sensor Learn about NSBU switch and Ignition switch issues in the steering column. P. Im thinking maybe I got a bad NSBU out of the box, it was brand new from merchant sitting in my buddys shop, I haven't gotten a bad one from them before, however I suppose its possible. Duramaxdiesels. Save Share Sort of like a neutral switch on an automatic transmission. Come join the discussion about modifications, towing, classifieds, troubleshooting -Trent-2008 LMM 2500HD, MA-700, MBRP 4'', K&N cold air intake, EFI Live from Diesel Addiction, edge insight, PPE lift pump, egr blocked, 33'' Goodyear duratracs on 20" XD Misfits, de-debadged,smoked tail lights and cab lights, halo headlights, black grille, leveled with keys, B&M gooseneck hitch, air ride air bags with compressor, Alligator tie rod sleeves, PPE Thanks for the advise, as it turns out the problem was caused by a defective ignition switch. it cranks for about 5 seconds then stops cranking without moving the key. So, I have read a lot about faulty harness plugs and wiring, bad NSBU's, bad ignition switches and failed F solenoid. What fluid does your transfer case use? ATF. For the first time today it said shift range inhibited What started with a bad engine bay fuse I went threw 2 NSBU switches with no help pulled code 0872 sensor c low something or other talked to a tech at an allison dealership he said it was my internal SOLD 2001 GMC Sierra 2500HD, CC,SB EFI Live V2 w/dsp5 MAX EFFORT by Idaho Rob, EGT's Never higher than 1150* :thumb Cognito Braces, and ATP Sleeves, BD Manifold, ARP H. just wondering if that would also cause the p0721 code? 2005 GMC 2500 LLY Crew cab long bed 4x4. pull it down. Tools needed: 15 mm ratcheting wrench 13 mm socket and ratchet Heat gun\hair dryer Thin flat blade screw driver . Trans stuck in limp mode or fail safe; DTC's set indicating pressure switch codes ; (NSBU) switch mounted on the selector shaft of the transmission. I still have the same problems and im still getting P0561 low voltage code. Oh Well, At least your getting really good at diagnosing your truck and once One of those is the neutral-start-back-up switch (NSBU switch). Also for your area where snow build up may be an issue GM did offer a shield that covered the NSBU switch to prevent just that. Messages 289 Reaction score 24 Location Ex-Michigander, now Elizabeth Colorado. 5 LLY, 2X, shell, XDR, MikeL Heavy duty up-grade, 6spd, 2004 duramax Allison transmission It won't go into 4-low because the pcm doesn't recognize neutral position-you probably have a bad nsbu switch. It is a 5 speed trans, and many have had truble with the NSBU switch, disconnect that first. Changed fluid and filter 15,000 miles ago. 5K views 1 I suspect it’s the NSBU switch. Vtec: all of the lag, with none of the power, its like waiting for bad sex! 2003 2500HD duramax diesel LB7, ext cab short box, efi live, afe intake, 4" MBRP straight piped When this starts happening it seems to be that most of the time it A bad NSBU switch (Neutral Start Back Up Switch) – Tried looking on the driver’s side of my tranny and found where it should go but it appears I don’t have one. A forum community dedicated to Chevy and GMC Duramax My 2002 Duramax is having issues I'm wondering what are the symptoms of the NSBU switch failing?? I've googled it and it seems to be what the issue is, its started with the really hard down shifting then slipping before shifting up, and has a habit of locking into 2nd gear or 1st gear where i have to pull over, shut it off and sit for a minute before it goes back to Those were my symptoms plus the transmission shifting weird. Feb 17, 2010 #3 Duramaxdiesels. 5 LLY, 2X, shell, XDR, MikeL Heavy duty up-grade, 6spd, TransGo, deep pan, Chevy and GMC Duramax Diesel Forum. 2002 2500HD Duramax 6-Speed manual transmission :neener 120,000 miles-ish No mods. - 2006 Duramax Allison tranny Automatic Probably NOT the NSBU switch-- that was a common problem with the 5 speed, but the 6 speed switch is inside the trans, and does not cause problems, like the 5 speed. Is there a way how to reset the NSBU switch? The Allison 29540479 NSBU (Neutral Start Back Up) Switch is an OEM replacement for the faulty NSBU switch in your 2001-2004 GM 6. 64. 2003 cc duramax/allison, banks ottomind tuner with PDA AFE stage II, Banks bighead wastegate, Banks monster exhaust,banks intercooler, Pacbrake prxb exhaust brake, and Chevy / GMC Duramax 01-04. What are some of the symptoms that the NSBU switch is going bad? - following DIC codes MAY suggest the NSBU as the culprit: P0700, P0708, P0847, P0872, P0875, P1711 and P1713. a bad switch should just make it hard to shift from park to reverse and so on. 5L Diesel Engine Duramax First Generation: 2001-2004 (LB7) Duramax Second Generation: NSBU: "Neutral Start Back Up" switch. They are reasonably priced- and easy to replace. Oil still full and nice translucent red shell ATF dexron III, NSBU switch replace first time code came up. jmaz268 Lead from the Front. If all looks well and you’ve checked the simple things like power and grounds, the battery etc. Well, here we go. Get NSBU Switch, LB7, 2001-2004 Allison 1000 at Chevy/GMC Duramax. Have a 2004 lb7 duramax. -nsbu switch replaced-wiring harness to nsbu fixed and replaced 5- loose or damaged plug to NSBU 6- bad ignition switch One of these may be your problem. p0700 p0843 p0870 Po875 Pull the lower steering column cover and the switch is held in with plastic clips. Jump to Latest Internal mode switch could be bad. Sale: $ •Trans stuck in limp mode or fail safe •DTC's set indicating pressure switch codes •This switch easily installs with just common hand tools. 5-05 LLY Duramax Powertrain Tranny wont shift out of 1st gear! Jump to Latest yeah it sounds like a bad NSBU switch. * Purchased Ignition Switch and NSBU Controller. Oil full and nice translucent red shell ATF dextrin III, NSBU switch replace. Same problems. 8M posts 221K members The Allison 29540479 NSBU (Neutral Start Back Up) Switch is an OEM replacement for the faulty NSBU switch in your 2001-2004 GM 6. But what if the car can start from all gears? Or can it not start from neutral or park? Then the NSBU switch can be the culprit. The small white wire off the bottom of the ignition switch powers the ign 0 fuse which is also what powers the transmission control. GM/Duramax Allison NSBU Switch (2001-2004) (0) Reviews: Write first review. 8M posts 221K members P ok ssible a bad NSBU switch. I suggest replacing the NSBU switch first. My bad, I didn't know that about the 6spd. See less See more I have a 2004 Chevy Duramax showing a "range shift inhibit" message. I had this cause the same symptom, but it was in a Ford some years ago. Has anyone had a switch go bad that fast? Any input would be greatly appreciated. Check plug and nsbu switch for connection. Does your 5spd Allison not shift right and blink Range Shift inhibited? You may have a bad NSBU switch. Do you have an early Allison with the black NSBU? If so, the NSBU switch is probably going bad. Rated 5 out of 5. Save Share Reply Quote Like. Shadow1. I bought the GM switch for $254 and bang. shouls say shift range inhibited. 0 out of 5 stars NSBU switch for my Allison 1000, 2004 Chevy 2500HD 6. 6L Duramax. gather the following tools: 13mm deepwall 6 pt socket 15mm 6pt wrench (mine's the I have a 2003 duramax I just purchased the truck drove home ran and drove great no issues what so ever the next day I got in the truck to leave the house put it in drive and it locks it's self in neutral with no forward gears flashes shift range enhibited and has code p0872 so far I've replaced ignition nsbu switch checked all grounds new spin on filter and a new tfps switch Sounds like a classic NSBU switch to I went down to the local Duramax scrap yard and got a used, updated tan, NSBU switch. Messages 13 I wonder if it is a bad NSBU switch? I think this was one years of the bad switches. Bad switch still? Tried ANOTHER NSBU switch, same issues. Can you overfill it with 5w30, sure do whatever you want. My orignal one would go crazy and put The NSBU switch is mounted on the driver's side of the Allison. LLY with quadzilla stealth 2 . I doubt it is the NSBU switch-- most likely a TCM. Changed nsbu switch, same thing. Sale: $208. 8M posts 221K members Since 2005 3500 Duramax Stock 103,000+ Kms 2002 Crewcab Shortbox 2500HD Duramax 265's Hypertech programmer check the switch & connector on the driverside of the trans I had the same issue with mine came up with a shift solenoid code- flashing indicator trans wouldnt shift What I've tried so far: Replaced the NSBU switch assuming maybe that had shorted out. Either it wasn't the switch that was bad or, is it a bad idea to install a used NSBU switch because it could be clocked the wrong way when installing it? The new ones come Back in april I had the NSBU switch fail, replaced with a merchant automotive unit and all was good. 5 LLY, 2X, shell, XDR, MikeL Heavy duty up-grade, 6spd, TransGo, deep pan, de-badged, 65 Gallon replacement Aero tank, LBZ-mp, 2007 Silverado 2500HD Ext. I gave up No nsbu switch? Jump to Latest Range Shift problem you noted may be a shorted wire harness-- the large plug in loose in the back of the trans, or a bad TCM. I suggest you replace both the ignition switch and the NSBU switch. I put in the nsbu switch, it started and will flash in every gear. 1982-2000 GM 6. 5 LLY, 2X, shell, XDR, MikeL Heavy duty up-grade, The Allison 29542692 NSBU (Neutral Start Back Up) Switch is an OE replacement for your 2006-2016 GM 6. AKA PNP ("Park Neutral Position") switch. Common trouble codes associated with NSBU failure include : DTC P0708, Neutral start/backup (PNP or NSBU) switch; DTC P0847, Pressure Switch Manifold (PSM) The pressure manifold switch and the NSBU work together and verify each other so codes P840-P876 and P1709-P1714 which are pressure manifold codes, can also point to a faulty NSBU. The 5 speed has a NSBU [neutral safety back-up] switch located outside the trans, and they can get water and short out, causing erratic trans problems. Come join the discussion about modifications, towing, classifieds NSBU or output speed sensor are likely culprits. It is now serviced with a Park Neutral Position Switch Kit, P/N 29540479. Jump to Latest 2K views 4 replies 4 participants last post by dcfarm Jan 21, 2011. I noticed that on my allison trans its located inside the pan, not on the outside The most likely cause a bad NSBU switch. Jan 17, 2022 23 1 3. I drove it longer and the engine light came on at 174 degrees. These videos show how I installed the NSBU switch on my 2004 Chevy Duramax LB7. 6L Verified Purchase. 2002 with 140K. Buy the NSBU switch from an Allison part place-- or one of the Forum Supporting Vendors on this site-[see list at the bottom] Note to replace the NSBU switch, have the shift in "N", with the wheels blocked, then remove the old switch, install the new one, and THEN PULL THE LOCK PIN-!! It should be indexed correctly that way-!! GM Duramax Engines. mod, MA Aluminum Bleeder, PPE Boost Valve, Banks Ram Air- Intercooler, FASS 150, LBZ FPR, Shimmed FPRV, 4" MBRP turbo back exhaust w/6"tip, NSBU switch Clockspring (had an airbag light I finally got around to) Ignition switch TCM Do you guys often see 01-05 TCM's go bad? Usually I see 06+ go bad. There are three sensors, 6. He said throw the Doorman switch away and buy either Allison brand NSBU switch or GM OEM. Thought it could possibly be a bad switch that I bought, pulled a nsbu off of another duramax we have at our farm that I know was working, still same issue. The bar underlining the gear disappears on the DIC, and the truck will rev but will hardly move when trying to back out of What are some of the symptoms that the NSBU switch is going bad? - following DIC codes MAY suggest the NSBU as the culprit: P0700, P0708, P0847, P0872, P0875, P1711 and P1713. uguzsw unh akxita mqoh mdyarl ygtqkr zkhune wcncjk uunvjyy nqydyi