DURAMAX SHIFT RANGE INHIBITED FIXED!!!
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- Опубліковано 9 лют 2025
- So your having problems with the shift range inhibited and it’s going in to limp mode and acting weird? Well I’m here give you some help!
1.Check your plug and wiring harness!
2.Check your NSBU SWITCH!
3.Check your ignition switch under steering column!
Also if your unfamiliar with what a NSBU switch and what the ignition switch is or does there are plenty of videos showing you what it is and how to change them!
first video so might sound retarted.
If you guys are interested in videos let me know might start posting some stuff SUBSCRIBE!
Instagram: jrsantana__
Comment if you guys have any questions!
Glad I found this video!!! Stopped by the local hardware store after work last night and my ‘09 Sierra wouldn’t budge. Got the “shift range inhibited” on my dash. Started searching online while waiting for my ride home and found this video. I went under the truck and found the plug under the passenger side and gave it a wiggle not expecting much. Low and behold I was able to get into gear and drive my truck home!! I’ll be getting under there today to give it a thorough cleaning. Thank you thank you!!! Nice job on the video, keep it up!!
Jake Penner glad this helped out man !!!👍🏼
Pro tip: you can watch series on Flixzone. Been using them for watching lots of of movies during the lockdown.
@Lennox Kayson yup, have been using Flixzone} for since november myself :D
Jai agree with Brandon we owe you for this great find - I Have a 2009 - 2500HD - Same issue as all. Cleaned the plug as you said, full of oil. It came back in 2 weeks with the shift Inhibit again. The cause was the wiring harness in the transmission. The seal was letting the oil into the plug. $ 360.00 new harness plus labor it's running awesome. I have seen mileage at 20 mpg and smooth running. It was causing a lot of little issues, rough idle, sluggish performance, weird shifts all of it comes back to this wiring harness. THANK YOU !!!
Hey thanks for the info. I am having the same issue. I think I need a new wiring harness. Do you have the part number by chance?
Dude
I had issues with my duramax thanks for your video. It fixed mine. For now 5/26/23
First of all Jai - Thanks for posting this vid - Super helpful. I will try and answer the question about how you get the plug off. Mine was coated in grime so first thing I did to see what's what down there I fully cleaned it by spraying simple green, scrubbing with a toothbrush and rinsing with water until all of the plug part was clean. The plug is actually the female part while the male part is attached to the transmission so the plug slips over the part attached to the trans and clicks in. Once it was all clean and I could see what's going on I inserted a 1" wide gasket scraper (a large flat blade screw driver will also work) in between the trans and where the bottom/end of the female plug almost meet, there is about a 1/16 gap. With one hand I grabbed the plug and pulled while I twisted the gasket scraper to help push it off from the bottom of the female plug part. It popped off without to much effort and it was full of transmission fluid. I disconnected the batteries and then spayed both plug and the pins on the trans side with electrical cleaner - I used a lot almost a quarter of a spray can and using the spray straw. Once I was sure both sides were clean and dry I put some silicon caulk into the small hole on the top of the female plug to keep fluid from entering there in the future. I added some dielectric grease to the female plug connectors and re attached. If I could have posted pictures here to show the plug parts I would have but I guess its not allowed.
I second the ignition switch, I have an 05 GMC 8100 w/allison 1000, intermittent issues with range shift inhibited that got progressively worse until the truck would almost never shift. There is a white wire on the back of the ignition switch that should have 12vdc when the ignition is on. $50 and 5 minutes, works great!
Dude. This is awesome. My trans was acting up. Pulled the plug on the passenger side. Had fluid in it. Cleaned it up. And what a difference.
Great to hear man, glad this helped out!
My 03 I can start it but won’t shift at all I pulled the plug on the passenger side indeed was full of trans fluid cleaned it plugged it back in and still won’t shift I’m thinking the nsbu switch any other ideas I also looked at the ignition switch as well
It worked!!! Extra tip guys… after I replaced the pass through seal I removed the green cap from connector and sprayed electric parts cleaner deep into the plug. Took two cleanings a day apart to get it right. No more delayed engagement or erratic shifting. Thanks again.
Glad to hear! And I agree it takes a couple try’s 👍🏼
I'll be checking mine tomorrow. Thx so much bud. This old dad really appreciates it.
Thanks for this video, one of my plugs on the driver side was not firmly connected. It took me a few seconds to get it back in place, it resolved my transmission issue not releasing last gear and weird shifting.
So many people have went and bought entire new transmission over that first plug you showed its insane.
If there's atf in the connector, it's due to the internal seal in the plug failing. Cleaning it is only a temporary fix. You can either replace the whole internal trans harness or you can buy the seal part of the plug separately.
Thank you so much for the tip! Fixed mine! You sure took a load off my chest! Way to go! 💪🏻😎👊🏻
Awesome to hear!!! 🤙🏽🤙🏽
*** unfortunately once the cold weather hit I am getting the "shift range inhibited" again and wont allow me to shift.
I have an 05 Duramax and I have on off "shift range inhibited" issues for the last 4 years. I have a company truck I never messed with it much. Everything online until this video showed replace the nsbu switch so I did a few years ago. Well today I drove my truck for the first time in awhile and it just wouldn't move after 30 yards. Watched this video, cleaned up plug and BAM! Fixed a 4 year old issue in 5 mins. I'm gonna spray it with dy electric spray just to give it a better seal now.
You should make a little video on removing the main electrical connector.
Thank u! I just did this to mine and it fixed the problem!!!! I owe u a beer!!!
Hahah happy this helped man!! And can’t reject that 🙌🏽
Just did mine today too. Was so dirty and caked, damn near broke off pulling the internal side apart. Makes a night and day difference
Glad it worked out !👍🏼
Did it ever neutral drop on you? Mines been neutral dropping a lot, and sometimes getting stuck in second gear
I didn’t have shift range inhibited but had other shifting issues and the plug from the tcm was the issue! video helped thank you!
Glad you found the issue man!👍🏼
Have an 2006 2500HD. Got the range shift inhibited read out the other day. Boat load of rain the last couple of days and a buddy mentioned moisture possibilty on some plugs/clips. Thanks for vid and tips.
Perfect that worked man thank you so much !!!! There was some fluid in the plug so I cleaned it and works perfect!!!!
Daniel & Danielle Thompson glad to hear man!!!!
Thank you Jai, you saved me time and money. I appreciate it!
HiLift2 glad it helped!!!
My LB7 sat June and July.
Mid July, I go drive it, and the ABS and Park Brake lights are on, and it's displaying Service Brake System. I tried driving it, it wouldn't shift to second. It would just go to neutral and then display Range Shift Inhibited, but no codes thrown or stored.
I checked what was covered in this video, and then I bled the brakes. The passenger rear passed some bubbles, and the rest had no bubbles.
This cured it, I started it, and there no lights on the dash, and everything is fine once again.
Truck Looks awesome man!! I really like where you put those Dmaxstore stickers!!
Hey I have the same problem with my duramax truck u think it will b so much better if I buy the new plug harness n just replace it
What headlights and mirror brands? Good looking truck.
Bud I just wanted to say thanks my 2004 GMC 2500 did same thing I checked what you said and that was the problem 3 weeks running great still
Very glad to hear!!
WOW! YOU FREAKING ROCK FOR THIS VIDEO! THANKS!
By some chance do you happen to know the name of this part in case I have to buy it?
My plug was covered with some oil. I went to auto store and got some contact cleaner. Went under the truck and sprayed around the plug. Have not had the issue at all in 2 1/2 months now.
Bernard Shelton glad this helped man and thanks for you feedback!!
Great video. Mine was full of fluid! Cleaned and good to go. Thank you
Glad this helped you out!🤟🏽
saved me a trip to a shop and a bill. thank you sir!!
Thanks man I just wiggled the connection and it started working again
So where is the oil coming from that is leaking into these plugs?
I’ve tried all of that on mine. Wonder if I should get an ignition switch from GM first. My TCM has been reflashed one time before. Any input would be great.
So my 04 is doing this shit I cleaned the plug didn't help I have a new nsb switch about to put it on also got a new ignition switch but do you have to reprogram the ignition switch or is it a plug and play item thanks in advance bub
thank youfor the help clean looking dirtymax
I want to echo what @brandon bogle just said. You saved my ass. filthy oil plug. Much love Jai!
Nm. I just had to replace my TCM
Im having an issue where she goes into drive but will not go into reverse, gonna try this tomorrow, hoping its the problem, never had any of this happen until a few weeks ago with a -35 feels like temp and my truck geled up and two new batteries later
Can you tell me what Cain of tools did you used to removed the plug? I’ll appreciate it.thx
Man im trying to figure out what’s goin on with my rig and I wanna try this but I cant even figure out how to get the plug off to clean it. Any video or help there ?
awesome thank you so much! my lbz did this for the first time yesterday
Jai, thank you for the recommended debug sequence - Daughters '05 Duramax is acting up - going to check it out using your guidance.
Vitale Wilkins great hope you can find it !
How do you get the plug off ?
Thank you bro you save my day
Glad I can help👍🏼
thanks man I have been fighting with my 04 for 3 months
im not getting any codes but from 3rd to 2nd or vis versa it will slam into gear when coasting to putting any acceleration. could this be the culprit?
KentuckyFaze yah same thing happened to me I believe it could be the wire is bent or dirty, check it and see what happens and re check it again if it doesn’t work. Took me a couple tires to figure out this was the problem.
@Rezolution similar situation on my 2013 LML 195,000miles a few days back just coasting and felt a slam. Three days later same and then check engine and code PO700 PO872. So just got the truck all cribbed up so hopefully in the days ahead go and check a series of things. Hope you’re up and going by now.
Just wondering if i pull that plug to clean it out, will it bring up any codes. Or because the truck is off it'll be ok. Or should the battery be disconnected first.
bigdave365 as long as the truck is off you should be fine. It won’t throw any codes if you take it off and clean it. Just remember to be careful when cleaning it not to mess up any pins. Take your time clean it good. Best of luck man👍🏼
After doing more research Merchant Automotive says the oil gets through because the seal is bad. They sell a new seal for $9.95. If there is oil in the connector the seal should be replaced.
bigdave365 makes sense hope it works out man.
It would help to know the year of truck you are talking about?
Bernard Shelton 2001-newer.
Thanks. Just ordered my new seal. Mine is drowning in fluid. Hoping this corrects my delayed engagement and hard shifts
Hope it fixes it as well, if there is fluid in there I’m very sure that is the issue!
@Kane Whitfield Turned out my transmission was trashed. I had it completely replaced with a rebuilt one. The delay I had was it would take a 5 seconds to go into gear after shifting it into D or R and overheat when towing.
are there any clips on this plug or do u have to turn it? i cant grab mine off and i don’t want to break it.
There are clips but some of them are glued from what I heard so there a pain to take off.
Hey guys glad to see that this is helping some people out there!! Big question i get is how do you take the plug off? On my lb7 it was easily as a clip.
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But I’m hearing that it is glued on the other models. So I was told to use a heat gun to take the glue off of the other part of the connection and that should work. There still a little hole on the plug where debris can get in so be sure to clean that plug best you can took me 3 tries before mine worked so don’t give up if it does not work the first time!
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Haven’t had this issue since. So I know for a fact that this was the problem!
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I had 10 codes all transmission related took it into shops and no one could figure it out. Gears were banging. Couldn’t go past 30. And lots of more weird things. Took the time and messed with the plug and it worked.
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Anyways guys thanks for all the input and helping each other out! Keep letting other people know what you found helped out or was the issue? No one wants to be in this annoying situation.
I have a Duramax that will run perfectly fine in reverse but neutral or any other gear it’s like the motor goes into limp mode
Where was the clip on your plug?
@@adrianpadilla7485 i mean i guess it was plugged in correctly, it looked like it had never been unplugged, it was fool of fluid.
we cleaned it with a aerosol type cleaner made for electrical components and it worked for about three hours and thin the entire thing started over.
it’s actually my brothers truck he has ordered a new Transmission module so we’re going to see if that fixes it
@@joshstaley7459 I would at least say don’t give up on cleaning the plug multiple times! Took me 3 tries to get it perfect! And let me know if that helps or if you end up changing the modular!
@@juniorsantana-DLH i will. he told me today that after we had cleaned it he put lithium grease in that plug and I don’t know why the hell he done that. I think now it may just need cleaned again
This worked for me !!
Thanks a bunch !!
Glad this helped!
Jai, Thank You, Thank You, Thank You!!!!!!!!!!!! My plug was full of tranny fluid, we'll see how long it lasts, I think the seal at the plug needs to be replaced. But, yea I think this has been a long time problem with the spastic shifting its had since I bought it 6 years ago used. I was really worried. Thanks again!
Hey partner thanks for the video. I'm currently having this issue but my R in the dash cluster is blinking,could this be the same issue? Never had a tranny issue with this truck just happen out of the blue.
Check the connection female pins springs metals
Thanks man for the tips fixed my truck
How do you take off that plug that had the trans oil on it? I can’t even move mine.
Bernard Shelton you just need to take the plug off. The plug is connected to a solenoid which does not need to come off. Your plug might be stuck on so I recommend to use pliers or something. Be cautious of not screwing up your wires.
Do you simply pull it off? Or is there some kind of tabs? I cannot get mine off either. Can you elaborate on exactly how to unplug this? Thank you in advance.
@@donschneider8339 Did you ever figure this out? I cannot figure out how to unplug mine either
@@audacian5660 no
To disconnect plugs on the NSB switch you need to use heat gun or hair drier. They are glued in place.
Almost impossible to remove without breaking switch otherwise. Not sure if plug on right side is the same (glued).
How u get the plug off pull twist squeeze
With the code was it still letting u put it into gear?
Have you had any problems to date since you pulled the plug and cleaned it?
I'm curious on how you took that Tcm wiring harness plug out of the transmission I'm having problems not with limp mode or shift range inhibited but with improper downshifting coming to a stop. it may be stuck solenoids or bad speed sensors but I'm trying to look for the easiest cause. a reply would be greatly appreciated.
Did you figure out how to take it off? Im currently having the same problem.
I came here also looking for help with the actual removal of the plug. Don't want to break anything
I believe I have the same problem. How did you remove the TCM cable from the back of the transmission? I can’t get it off and don’t want to break it. Any advice would help.
Many people have had that problem, some of the duramax have the Tcm plug glued on and you may have to use a heat gun to take off the plug. Then should pry off with enough heat.
Does this apply to all years of duramax engines and Transmissions? I have an 11 LML Duramax 2500HD with 156586mi on it. Literally just threw this code through a trun I made. Luckily it didnt shut the truck down but it wanted to. Also I'm glad I was only 5mins from the house.
I know it applies to the 2011 trucks as well and like I mentioned I would definitely check it out the things I mentioned. It could also be a number of other things? Fuel pump? Dirty fuel filter, depends on the symptoms! Hope you get it figured out!
@@juniorsantana-DLH thanks I appreciate the reply! Have a good one!
@@wrathmax1887 absolutely good luck man!🤙🏽
Was it throwing any codes? Do you remember which ones?
Clean truck man!!! What tires you running on that beast?
So what about fixing the issue with tranny fluid leaking through the connector @ trans?might want to address that issue if you want long time results 👍🏼
Got a 02 cclb lb7 slams in gear, replaced torque converter, NBSU switch, won’t move at all now will start but no codes gear indicator just starts flashing and doesn’t show when I have it in park
Wyatt Hemby I can almost guarantee it’s a wiring issue!! Recommend to check all your wiring or replace the modular I show in the video. Seems your transmission is not responding right and I had the same issue as well. Transmission would slam in gear and not shift out or would go into limp mode as well as shift range inhibited.
jai santana goin to try and clean the connector then the ignition when I’m allowed to leave base again, damn virus, truck sat for 10 months then started 3 try but wouldn’t move
Virus sucks man! And yah try it out and let me know how it goes !
This might be a dumb question, how do you get the plug out? I’m able to spin mine about a quarter turn but still can’t get it out
Michael Coates you don’t need to take that whole thing out just disconnect the plug and clean the hell out of it. Also be sure to not mess up your pins.
Just wanted to follow up in case it helps others out. Mine ended up being my ground wire. I took it off cleaned it up and it hasn’t happened since. I will be replacing the ground wire on driver side as it seems to be brittle. Thanks for the video!!
Michael Coates thanks for your input man!! Glad you found it!
@@juniorsantana-DLH but how! Do you disconnect it?
@@michaelcoates4775 where is that ground wire located bro
I am replacing the whole wiring harness in the transmission. The plug was leaking and after I cleaned it all out, it worked great for 2 days and then the problem started again. Parts will be in today.
would it be bad to spray brake cleaner to clean the plug coming from the transmission shown in the video
Andrew Harper yes you can spray break cleaner on the plug!👍🏼
@@juniorsantana-DLH so i clean the plug and the change out the ingnition switch so im guessing only thing left is the NSB
Andrew Harper yes change the NSBU switch and if it still doesn’t work re-check the plug harness pull the tape off and make sure no wires are bent or ripped
Anyone know where I can get a new wire harness that connects to the pan ? I’m pretty sure I messed up the wires trying to take it off , I replaced the internal harness since I had a leak coming out of the internal harness ?
You need to replace the internal transmission harness or this will just happen again because the trans fluid is leaking out of that connector
What year model is this truck? Is this an LLY?
Just saw this Lb7 this applies to most the Dmax years.
How did you get it unpluged and it's the round plug on the rear of the tranny
Yeah but how does this plug come off to clean it. Push and twist? Twist? Or pinch n pull? I can't get it off
Many people have had the same question on mine it just came off. I’ve been told that the plug is possibly glued to the other need of the plug so you’ll have to use a blow dryer or heat gun and it should come off. There is still a little hole on top where debir can still enter so would defiantly give it a shot.
One of my wires on the prongs sticking out father than all the others is that normal
Tony Mondo hmm I don’t remember any of mine being longer than the others.
@@juniorsantana-DLH i thinking it got stuck in the plug wean i pulled on it
Ese cable. Cual es su trabajo en la caja
So what are some other symptoms you got. I got code p0875 and hard clunk when put on drive or reverse.
Francisco Chavez I had 10 codes for my transmission lol and I had all the above with my transmission acting up! Hard clunk, wouldn’t shift, etc...
So does the plug have any specific way to pull it out. The one connected to tcm and tranny. Im having trouble pulling mine off. Any tips
Francisco Chavez so you do not usually need to take the whole assembly out, you just need to take out the plug in order to clean it, if the plug is stuck it’s self then if use some small tools to help pry it out just be careful to take it out.
@@juniorsantana-DLH what exactly did you use to clean the connection
Francisco Chavez I used break cleaner and , a picket tool with A very small and shrap edge
My 2006 Duramax has been acting and sounds different when i brake almost like a vibrating noise on the driver's left side by brake pedal. Last week or two it's gone limp mode and I'm getting shift range inhibited . Also I have the glow plug number 8 and internal heater code.. she need some maintenance ASAP
Did you clear that limp mode?Mine said fuel rail sensor changed it but now only goes into limp on last gear on hard acceleration
@@jimmygomez4934 yeah bro I need to fixing up the glow plug eight but the actual sound that I was hearing in the left side of my pedal was my freaking power steering fluid was out I feel like an idiot bro all I did was add fluid and they went away. Fast forward 4 months and now my power steering feel like it's out I thought it wrong day mechanic told me might it might me the power steering lines upper and lower
What year?
What do you use to clean the transmission sensor ?
Brad Johnson I used an air gun and used a small tool pick and paper napkin to get in the sensor. Just be careful not to mess up the pins.
jai santana thanks man, i checked that and it was definitely full of transmission fluid
Brad Johnson glad you found it man.
jai santana did u have a p0700 code and a service brake system?
landon hutchinson I had that code along with 10 other codes. And no I don’t believe I had a service break.
If it has oil / transmission fluid on it it needs a new harness they go bad and start leaking
Awesome thanks so much 👍👍
No problem!! 👍🏼
My truck doesn't have any check engine but it does take a little long to shift
If the pass through connector is full of ATF I hope you replaced the harness with a new one. That's how we took care of the issue at the dealership. Otherwise it will happen again. You don't want that.
How did you clean the sensor?
rolando zepeda pulled it out used a pick tool with a needle tip and napkin and pull out all the oils and grim also used a air gun to get it all out. Just make sure to be careful not to break any of the needles also make sure to seal the grommet after with tape so that no debri gets in there.
Shoot in landscape mode dude not in portrait mode it makes it much harder to see!
Chevy513 I’ll keep that in mind thx
I’m sorry I got my oil in your connector. 😂
So my truck is a 03 Duramax... while out plowing, I went to put my truck in reverse & it made a loud bang. But nothing happened. When I put it in reverse or drive, BANG, but the tires don’t move. There’s no power getting to the drivetrain at all. Motor revs up, sounds great, but nothing. Anyone think these solutions in the video would cause my truck to do that? Or does anyone have some insight as to why my trucks doing that & how to fix it.? Any help is appreciated!!
-Thanks In Advance!🤘🏽
That’s a pretty typical think with what I mentioned happened to me all the time, guessing that your plowing, I’m positive that the plug is wet or has debris inside of it. Check that plug, clean it, and wrap the plug with tape to prevent things from entering. If that does not work follow the other steps I mentioned!👍🏼
@@juniorsantana-DLH thank you very much! I’m gonna get under there tomorrow & do that!! MUCH appreciated!🤘🏽Stay Boostin🤘🏽
@@MrJermbag no problem man good luck! Likewise!🤙🏽👍🏼
My 2010 Duramax did the same as yours in reverse. Were you able to fix it?
@@AriasGamingKC pulled out the sensor in the tranny, cleaned it out with the air hose, plugged up the hole on the side of the clip & it’s worked MINT! Haven’t had the problem ever since doing what he said in the video! Definitely worth trying out what he says to do in the video, rather than bringing it to a mechanic for them to do the same thing, but charge you an arm & a leg lol good luck with yours!! Hope it works for you too!!
I have an 07 same thing goes in to reverse but soon as I put in d it shows shift range inhibited and it won't be at all
You ever figure it out?
I have a 2003 lb7 and mine shifts fine if I let it shift at 2k rpm. Then if I give it throttle it throws it into neutral it seems like then I let off and it shifts back into the gear I was in but after that it doesn't shift out of that gear no matter how fast or slow I go. If I hit the gas to the floor it'll throw the truck into nuetral it seems like and I have to turn the truck off and on again to get it to move again. Any ideas anyone?
I would definitely check your plug if is dirty or not and also check the connection and see if there is any bent wire on that connection. Make sure you give it a good check. I have had my LB7 do some verrryyy odd things when that happened to me .
Did you find out why it was going to neutral?
Brother, thanks is not good enough... You just save me couple hundiii towed truck plus diag fees just for a filthy plug... 👍🇺🇲👍
Glad it helped man👍🏼
Thank you 🩷 This turned out to be my issue!!
thanks dawg
I just ordered an 700 dollar aftermarket tcm for my truck and I swear if this what’s wrong I’m going be so pissed
What code
Good info
Most likely the tcm
You probably will need to replace the internal harness if it’s full of tranny fluid
Tried all of this still stuck in range shift
I would still try to check out your plug, took me 3 tries before realizing it was that. 5 mins won’t do it make sure you take your time and check further beyond the plug and make sure no wires are bent or broken.
Bro sweet