Why does my GMC Duramax not shift gears?

Be sure you also check for damaged wires. If the display works OK when shifting gears, the NSBU switch may be OK. Another possibility is a bad ignition switch– many have had problems with this part. Only other thing I can think of that I have done to the truck is I took the aftermarket radio out be put the stock one back in while it was parked.

Why does my GMC TRA not go into gear?

If there is an issue with either of these the vehicle may experience problems shifting or transferring power to the wheels. If these are not the problem then it could be possible that the transmission is having internal faults, perhaps a worn torque converter, or transmission gears, inside of the transmission.

What to do when automatic transmission won’t shift into 3rd gear?

Check the Throttle Cables. Changing the fluid solves plenty of transmission issues but if the problem of automatic transmission won’t shift into 3rd gear persists, the parts you should check are the throttle cables. A defective cable with excessive slack is likely to create issues with smooth shifting of the gears.

Why is the Speedo not working on my Duramax?

Speedo isn’t working and the service Brake system light is on along with the parking brake indicator and the abs lamp. Still isn’t showing the gear indicator. What other speed sensors does this truck have?

Why is my Chevy Silverado only getting 3 gear?

Another thing is, if you keep it in drive you’re only getting 3’rd gear, but if you manually shift it into 2’nd gear, it’ll go there. That makes taking off much better on the transmission. In either first or second gear, the torque converter slips more than it normally would on a takeoff.

Why does my 2003 Chevy Silverado have transmission problems?

It may be (but is less likely) that the sun shell went bad as well. If your 2003 Silverado Transmission has a problem moving in any gear, it’s likely caused by a lack of transmission fluid. No matter how silly that sounds, and how convinced you are that it’s not the problem, go ahead and check it anyway.

What are the most common 6.6L LB7 Duramax problems?

What Are The Most Common 6.6L LB7 Duramax Problems? The LB7 Duramax engine made its debut on Chevrolet and GMC HD trucks in 2001. These diesel engines are where the Duramax started, and they have been so successful that the Duramax are still used in GM HD trucks today.

What are the problems with a Duramax diesel engine?

Both of these issues result in fuel leaking from the injector which can then enter the crankcase. This can lead to more serious problems, as diesel fuel doesn’t offer the same lubrication properties as oil. You’ll also experience loss of power, excessive smoke, rough idling, and engine misfiring.

What kind of transmission does a Duramax pickup have?

Nearly all Duramax powered pickup trucks were equipped with the Allison 1000 automatic transmission, with the five-speed version running from 2001 to 2005, and the six-speed starting in 2006 and running until 2019.

Why is my Duramax not shifting out of 2nd gear?

Hey guy my name is john I have a 2001 2500hd duramax and it seems to me it’s not shifting out of either second or 3rd and the shift indicator lights work perfect but staying stuck in either 2 nd or 3rd gear any help would be so greatly appreciated 04LLYDMAX…. Did you ever figure out your problem?

Are there any issues with the Duramax pickup?

This can produce long cranks and hard starts. Glow Plug System Issues – Nearly half of the check engine lights that come in for the Duramax pickups are for glow plugs. The glow plugs burn out over time and can be a real nuisance to remove from the aluminum heads sometimes.

Are there any major problems with the L5P duramax?

Mechanically, the L5P Duramax is stout and very few major problems have been reported. One common problem is with the MAP sensor however, as it tends to clog with soot and throw a check engine light, but a simple MAP sensor spacer and a can of electrical cleaner can get you back on the road worry free and prevent the soot from building up again.

What are the transmission specs for a Duramax Diesel?

Allison 1000 Specs & Ratios. The Allison 1000 has been the standard automatic transmission for the Duramax diesel since its inception in 2001.

Can a bad speed sensor affect shift timing?

Harsh or improper shifting. Without a valid speed signal from these sensors, the PCM will not be able to correctly control the shifting of gears within the transmission. This may cause the transmission to shift roughly or more quickly than normal. It’s also common that a problem with these sensors can impact the shift timing,…

Why is my Duramax range shift not working?

When i put my 2003 chevy duramax into gear sometimes it says range shift inhibited and won’t go any where. Clicking this will make more experts see the question and we will remind you when it gets answered. You can’t post conmments that contain an email address. An expert who has achieved level 1.

Allison 1000 Specs & Ratios. The Allison 1000 has been the standard automatic transmission for the Duramax diesel since its inception in 2001.

What kind of transmission does the LB7 Duramax have?

Allison Transmission – The Allison transmission behind the LB7 Duramax to be honest is nothing to brag about in stock form. If you add a programmer that adds 100 horsepower or more, you will be able to limp the transmission.

What to do if Duramax shift range inhibited?

DURAMAX SHIFT RANGE INHIBITED FIXED!!! If playback doesn’t begin shortly, try restarting your device. Videos you watch may be added to the TV’s watch history and influence TV recommendations. To avoid this, cancel and sign in to YouTube on your computer. An error occurred while retrieving sharing information.

How big is the nsbu switch on a Duramax?

Slide the new NSBU switch over the selector shaft. The metal clip (neutral assurance bracket) on the switch helps to ensure the switch is properly aligned to the shaft. For the geeks out there, the bolts should be tightened to 18-21 lb ft.

Why does my GMC Yukon not shift hard?

Goes from first to second with the rpms jumping up between each gear shift. If i feather the accelerator it doesnt shift as hard. If i get on the throttle it messes up in most gears. Please tell me my transmission doesnt need to be replaced. You have a bad TCM.

Why does my durmax truck say range shift inhibited?

I am hoping someone will have an answer to what is going on with my 2004 GMC Sierra 2500 HD Durmax truck. When I go to shift into gear (reverse or drive) on the dash a message appears “Range Shift Inhibited,” and the truck does not engage into gear. I have to put it back into park and shift into gear again.

Came home and washed the truck. after checking the NSBU switch check the linkage. NSBU connecters are very well sealed form the factory. they have silcone inside the connector. they are very hard to disconnect. you could have bend or kinked shift linkage.

When do I Trans Flush my GMC Truck?

I did an trans flush about 6 months ago but it started doing this 4 months after. When Reverse is under a load it’s like the truck is in N. Also just the other day the truck made a loud banging noise in drive.

What causes the gears to slip in a car?

Low transmission fluid will cause the transmission to slip the gears. If the fluid is good and the transmission has been serviced before, then the clutches inside the transmission are slipping and it will need either rebuilt or replaced.

Why does my car not shift into third gear?

Such a problem is automatic transmission won’t shift into 3rd gear. The transmission shifts into the first and then to second gear but does not move into the third gear. It seems that the gear slips into neutral when you push it to the third. Another instance could be the automatic transmission won’t shift into 3rd gear at all.

What to do if your transmission is not shifting?

If the fluid is good and the transmission has been serviced before, then the clutches inside the transmission are slipping and it will need either rebuilt or replaced. If you need further assistance with your gears slipping on acceleration, then seek out a professional, such as one from Your Mechanic, to help you.

Why is my GMC Sierra not shifting past 2nd?

No change then changed transmission. Still same thing that black plastic box on the side was cracked I just changed it still nothing. One fella said maybe change get out that cluster that plugs into the box. I’m at end of my rope. It’s Christmas and im getting really bummed where is there a fuse or relay if anybody can help please. Kathy in tx

Why is the transmission not shifting on my Chevy Silverado?

Take a couple of easy steps to see why your truck is not shifting. No need to panic yet. This article applies to the Chevrolet Silverado GMT800 (1999-2006). Your transmission is just supposed to shift and leave you alone.

What causes a Duramax injection pump to fail?

As a result (allegedly), the lack of lubrication in the fuel can cause a premature failure of the injection pump, to a point where it won’t allow the LML Duramax to run. You can be driving down the road and everything seems normal, and when the pump fails, the truck just shuts off.

Are there any problems with the Commons 6.6L Duramax Diesel?

Common Problems with the 6.6L Duramax Diesel. The 6.6L Duramax has been in production since 2001 and has proved, on a large scale, to be a relatively reliable and durable platform. While various versions of the engine have surfaced over the years, all generations of the Duramax are based on the same foundation.

Are there any problems with the Duramax engine?

The failure is most common in higher horsepower engines, but can still occur in moderately modified and even stock power plants. Not specific to one version of Duramax in particular (ex: LB7, LLY, LBZ, LMM or LML), the problem exists across all generations.

Why is my shift inhibited neutral not working?

It could be that you didn’t see the expected turbine speed pull down, or that output speed was too high when range was selected.

Why is my diesel truck rolling in neutral?

Be careful not to become transmission hypochondriacs, my thought is that the OP has nothing wrong with his 2008 other than the set of events with the truck rolling in neutral and selecting range. Yea, it must be air in the system on my 2007.5 because Im sure I didn’t fill the filter when I changed it. Dumbass of me.

What kind of transmission does a Duramax diesel use?

It was the first to come bolted to the six-speed Allison transmission which provides a lower cruising RPM and greater fuel efficiency when compared to the five-speed on the LB7 and LLY.

What does shift inhibited shift to N to reset mean?

On nov 1st I parked my truck at my grand parents went in to visit for a few minutes. Went out to my truck started it and shifted it into drive. Nothing. The cursor inderlining the D was flashing and a message said shift inhibited select N to reset. I put it in N then back into drive and it didnt work.

What is the Allison Transmission part number for Duramax?

Neutral safety backup switch issues are another common Allison Transmission problem on the GM Duramax versions. If the D doesn’t light up on your gear indicator, this could be the issue. It is part number 29540479.

Is the Duramax Allison 1000 a hard shifting car?

I have an ’04 duramax/allison 1000 with a banks 6gun + 5.5″ exhaust, it has about 80,000miles on it. lately its been shifting pretty rough between 60 and 70mph, and just today on the highway it wouldn’t even shift. It was about 2400-2800rpm, and the trans. just wouldnt shift running at about 73-74mph.

Are there transmission problems in my 2004 GMC Sierra?

Now, these trucks are getting older, and it’s very likely that your 2004 Sierra may be having transmission problems. Below, you’ll find a ton of troubleshooting your transmission problems.

What’s the speed of an Allison hard shifting diesel?

It was about 2400-2800rpm, and the trans. just wouldnt shift running at about 73-74mph. I think its getting stuck in 4th gear, but I could be wrong.

Where does the shifter rest in a 5 speed transmission?

As with all five speed transmission – no matter whether it’s a car, light truck, or a big truck – the shifter rests between the two middle gears. So for the purposes of a big truck it rests between first and second. If you’re in your car or light truck it’ll rest between third and fourth, which are the middle gears.

How do you get more gears in a 5 speed transmission?

So the way that you get more gears on a 5-speed transmission in a big truck is on the front of the shifter is the range selector – down is low and up is high. The only time you use the range selector is between fourth and fifth.

What happens if the crankshaft on a Duramax goes bad?

Perhaps the most devastating of all Duramax failures is a broken factory crankshaft. Not only does this mean game-over for the engine, but it results in a truck that’s down for weeks (if not months) and a huge chunk of change missing from your wallet.

How many gears do I need in my truck?

I assume you have 3.42 gears in your truck right now, maybe 3.08s or 3.73s. If you have 3.08s definitely gear to 4.56s if you have 3.73s it may be okay to run for a little bit, really all depends on how much of the loss of power is going to bother you.

Why does my GMC Duramax not shift gears?