Chevy Silverado 2500 HD Transmission Problems & Cost | 4L60E | 4L80E | 6L90 | Allison 1000

If you buy a Chevrolet Silverado 2500HD, then you’ve obviously got stuff to haul. But this truck does a lot more than just haul and tow stuff. It can be your daily driver, family vehicle, and it may even be able to get reasonable fuel economy, if it’s equipped properly (i.e. Silverado 2500HD Duramax). However, Chevrolet Silverado 2500 transmission problems do still happen. So let’s find out what you can do about them.

Need a replacement transmission? Get an estimate for replacement transmissions and local installation. Look up your transmission model by vehicle make and model.

What Transmission Do I Have?

Chevy Silverado 2500 HD Transmission Models

Chevy Silverado 2500 HD: 4L60E Transmission
Chevy Silverado 2500 HD: 4L80E Transmission
Chevy Silverado 2500 HD: 6L90 Transmission (Late Models)
Chevy Silverado 2500 HD: Allison 1000 Transmission (6.6L and 8.1L Diesel Only)

Chevy Silverado 2500 HD Transmission Replacement Cost Estimate

Pricing varies by model. To be 100% sure on pricing, have your VIN# handy and use our Get An Estimate feature to look up your transmission by VIN#.

Replacement 4L80E Transmission:
The 4L80E is a heavy duty 4-speed automatic transmission, and it’s an evolution of the 3-speed Turbo-Hydramatic 400 / TH400 transmission that was first introduced in 1963. The heavy duty internal components are rated to withstand engines with up to 440 lb-ft of torque, and a GVWR of up to 18,000 lbs. This modernized Chevrolet Silverado 2500 transmission was introduced back in 1991, and featured an overdrive gear, along with a lockup torque convertor, and electronic controls that optimized shifting behavior, engine performance and efficiency.

TransmissionStreet Smart TransmissionAutozoneAdvance Auto PartsDealer Retail
6L80 / 6L902190252025392930
Allison 10002490285028994200

Replacement Allison 1000 Transmission:
The Allison 1000 is a heavy duty automatic transmission that’s based on an earlier Allison medium-duty commercial truck transmission. It was initially offered as a 5-speed, but a 6-speed version followed around 2005. Later incarnations of the Silverado 2500 Allison 1000 featured more advancements, including a Low Traction Mode, Cruise Control Grade Braking, and Park Warmup Mode.

Replacement 6L90 Transmission:
The 6L90 transmission was first paired with the Chevy Silverado 2500HD 6.0L in 2007, and featured a number of advanced features that were designed to improve performance and driver control. Some of modern elements include a four element torque convertor with an integrated pump, unique planetary gearsets for a wider range of gear ratios, clutch-to-clutch shifting, and an advanced TCM (Transmission Control Module) that allows for a Performance Algorithm Shifting (PAS) program for instant shift pattern adjustment changes based on load, a Driver Shift Control program for manual shift capability, and automatic grade braking / engine braking. The maximum engine torque capacity for the Silverado 2500HD 6L90 transmission is 531 lb-ft and a GVWR of 21,000 lbs.

What are the DTC codes related to Chevy Silverado 2500 HD transmission problems?

Trouble CodeDescription
P0706Transmission Range Sensor Circuit Range/Performance
P0711Transmission Fluid Temperature Sensor Circuit Range/Performance
P0712Transmission Fluid Temperature Sensor Circuit Low Input
P0713Transmission Fluid Temperature Sensor Circuit High Input
P0714Transmission Fluid Temperature Sensor Circuit Intermittent P0715
P0715Input/Turbine Speed Sensor Circuit
P0716Input/Turbine Speed Sensor Circuit Range/Performance 
P0717Input/Turbine Speed Sensor Circuit No Signal
P0718Input/Turbine Speed Sensor Circuit Intermittent
P0719Torque Converter/Brake Switch B Circuit Low
P0720Output Speed Sensor Circuit
P0721Output Speed Sensor Circuit Range/Performance
P0723Output Speed Sensor Circuit Intermittent
P0724 Torque Converter/Brake Switch B Circuit High
P0740Torque Converter Clutch Circuit Malfunction
P0741Torque Converter Clutch Circuit
P0742Torque Converter Clutch Circuit Stuck On
P0748Pressure Control Solenoid 'A' Electrical
P0751Shift Solenoid 'A' Performance or Stuck Off
P0752Shift Solenoid 'A' Stuck On
P0753Shift Solenoid 'A' Electrical
P0756Shift Solenoid 'B' Performance or Stuck Off
P0757Shift Solenoid 'B' Stuck On
P0758Shift Solenoid 'B' Electrical
P0776Pressure Control Solenoid 'B' Performance or Stuck Off
P0777Pressure Control Solenoid 'B' Stuck On
P0785Shift/Timing Solenoid
P0796Pressure Control Solenoid 'C' Performance or Stuck off
P0894Transmission Component Slipping
P0965Pressure Control Solenoid “B” Control Circuit Range/Performance
P0966Pressure Control Solenoid “B” Control Circuit Low
P0967Pressure Control Solenoid “B” Control Circuit High
P1860TCC PWM Solenoid Circuit Electrical
P1870Transmission Component Slipping: GM Transmission
P2715Pressure Control Solenoid ‘D’ Stuck On
P2723Pressure Control Solenoid ‘E’ Stuck Off

Chevy Silverado 2500 HD Transmission Recalls

None Found

Chevy Silverado 2500 HD Technical Service Bulletins (TSB)

TSB 01-07-30-002C – Transmission stuck in third gear with inoperable instrument cluster and multiple DTC’s – 4L60E Transmission & 4L65 Transmission 
1999 – 2003 Cadillac Escalade – 2002 – 2003 Cadillac Escalade EXT – 2003 Cadillac Escalade ESV – 1997 – 2003 Chevrolet Silverado – 1997 – 2003 Chevrolet Suburban – 1997 – 2003 Chevrolet Tahoe – 1997 – 2003 Chevrolet Blazer – 1997 – 2003 Chevrolet Express – 1997 – 2003 Chevrolet S10 – 2002 – 2003 Chevrolet Avalanche – 2002 – 2003 Chevrolet Trailblazer – 2002 – 2003 Chevrolet Trailblazer EXT – 1997 – 2003 GMC Sierra – 1997 – 1999 GMC Suburban – 1999 – 2003 GMC Yukon XL – 1997 – 2003 GMC Yukon – 1997 – 2001 GMC Jimmy – 1997 – 2003 GMC Savanna – 1997 – 2003 GMC Sonoma – 2002 – 2003 GMC Envoy – 2002 – 2003 GMC Envoy XL – 1997 – 2003 Oldsmobile Bravada
Problem – Vehicles equipped with the 4L60E and 4L65E transmission may become stuck in third gear, the instrument cluster may not function, and the following DTC’s may be set: P0740, P0753, P0758, P0785 and P1860.
Solution – The most likely cause of this transmission problem is a blown fuse or an open on circuit 1020 between the fuse panel and the transmission. If no battery voltage is found at the fuse, the ignition switch will need to be replaced

TSB 00-07-30-022D – No reverse, second or fourth gears – 4L60E Transmission & 4L65E Transmission 
1993 – 2005 GM passenger cars and light duty trucks
Problem – Drivers may experience the loss of reverse, second and fourth gears. First and third gears will seem to function normally
Solution – The reaction sun gear may fail inside of the sun shell. It will need to be replaced with a stronger heat-treated 4L60E / 4L65 sun gear.

TSB 01-04-17-004B – Clunk, bump or squawk when vehicle comes to a stop, or when it is accelerating from a complete stop – 4WD/AWD vehicles with a one-piece propeller/drive shaft only
1999-2004 Cadillac Escalade, Escalade EXT, Escalade ESV – 1996-1999 Chevrolet 1500 Series Extended Cab Short Box Pickup (Old Style) – 1996-1999 Chevrolet 1500 Series Regular Cab Pickup and Utility Models (Old Style) – 1999-2002 Chevrolet Silverado Extended Cab Short Box (New Style) – 1999-2004 Chevrolet Silverado 1500 Series Regular Cab (New Style) – 2000-2004 Chevrolet 1500 Series Avalanche, Suburban and Tahoe – 2001-2004 Chevrolet Silverado 2500/3500 Series Regular Cab with Long Bed or Extended Cab (New Style) – 2001-2004 Chevrolet Silverado 2500 series crew cab, short box (New style) – 1996-1999 GMC 1500 series extended cab short box (Old style) – 1996-1999 GMC 1500 series regular cab pickup and utility models (Old Style) – 1999-2002 GMC Sierra extended cab short box (New style) – 1999-2004 GMC 1500 series Yukon, Yukon XL – 2000-2004 GMC Sierra 2500/3500 series regular cab with long bed or extended cab (New style) – 2001-2004 GMC Sierra 2500 Series Crew Cab, Short Box (New Style) – 2003-2005 HUMMER H2
Problem – In vehicles equipped with 4WD or AWD, drivers may experience a clunk, bump or squawk noise when they come to a stop, or when accelerating from a complete stop. This may occur during the 2-3 upshift or 3-2 downshift.
Solution – Replace the rear driveshaft slip yoke with a more robust nickel plated slip yoke.

TSB 05-07-30-017B – Water contamination – 2004-2006 Chevrolet Silverado 2500 HD 4L60E 
Problem – A common transmission problem occurs when the transmission shudders/shakes between 40 and 50 mph, as the torque convertor clutch engages. This is caused by rain water getting into the transmission through the dipstick.
Solution – The air inlet grille panel will have to be modified according to the procedure outlined in the TSB.

TSB PIP4051C – Harsh Shifting – Chevrolet Silverado 2500 HD 4L60E
Problem – Unusually harsh gear changes, combined with a P0717 DTC for an input shaft speed sensor error, are often caused by damage to the ISS sensor wiring.
Solution – If wire damage is found (usually to the white wire), the wiring and sensor will have to be replaced. The pump cover should also be examined for sharp points/edges that could damage the wiring. If any are found, they should be smoothed with a file.

TSB 04-07-30-028A – Transmission fluid leak from reverse servo cover – 4L65E
Problem – An ATF leak can occur under the vehicle during cold weather (temperature below 20°F/6.7°C), due to a failed reverse servo cover seal.
Solution – To remedy the problem, an upgraded (see: better quality) reverse servo cover seal will have to be installed.

TSB 08-07-30-016 – Slipping, refusal to shift, overheating Chevrolet Silverado 2500 HD 4L80E 
Problem – Slipping between the gears, overheating, refusal to shift out of a gear, and/or DTC P0894 or P0218, may be because by friction material debonding from the torque convertor clutch (TCC).
Solution – If the friction material has circulated throughout the transmission, the entire transmission may need to be replaced. It is possible to remove the material from the internal components (like transmission cooler lines and the valve body), but it depends on the extent of the damage.

TSB 08-07-30-001  2001-2006 Chevrolet Silverado 2500 HD 4L80E
Problem – Harsh or delayed shifts, slipping, no forward/reverse gears. Possible DTCs: P0741, P0742, P0751, P0752, P0756, P0757, P0894.
Solution – Rebuild or replace the valve body.

TSB 08-07-30-015 – 2002-2007 Chevrolet Silverado 2500 HD 4L80E
Problem – Harsh shifts, delayed 2-3 shifts, 2-3 shift flare, no 3rd gear, slips in 3rd gear or reverse. Possible DTC 0757.
Solution – If none of the issues described in Bulletin 08-07-30-001 are present (debris in #11 checkball, leak in oil circuit, damage to the direct clutch), then replace the 2-3 shift solenoid due to a possible sticking pintle.

TSB PI488C – No forward or reverse and/or slipping – 6L80 Transmission | 6L90 Transmission 
2010 – 2014 Cadillac CTS-V – 2010 – 2014 Cadillac Escalade (all models) – 2010 – 2013 Chevrolet Avalanche – 2010 – 2014 Chevrolet Camaro – 2010 – 2014 Chevrolet Corvette – 2010 – 2014 Chevrolet Express – 2010 – 2014 Chevrolet Silverado – 2010 – 2014 Chevrolet Suburban – 2010 – 2014 Chevrolet Tahoe – 2011 – 2014 Chevrolet Caprice PPV – 2014 Chevrolet SS – 2010 – 2014 GMC Savanna – 2010 – 2014 GMC Sierra – 2010 – 2014 GMC Yukon – 2010 – 2014 GMC Yukon XL – 2010 – 2014 GMC Yukon Denali
Problem – Trucks equipped with the 6-speed 6L80 or 6L90 transmission may experience no forward or reverse engagement, or slipping between the gears.
Solution – This problem could be caused by a cracked or split transmission filter. If this is the case, the transmission pump should be disassembled and inspected for possible damage. Inspect for any of the following conditions: – scored pump rotor or pump vanes – scored pump cover or pump rotor pocket – cracked pump slide.

The transmission should also be evaluated for any possible distress to the clutches. GM’s testing and analysis found that split or damaged filters may be caused by a damaged transmission pump. This can send a high pressure fluid spike down the filter neck on a cold start, resulting in the filter body cracking or the filter seam splitting. The filter is not defective and this is not a filter quality issue. Important: Do not replace the filter without inspecting the pump. Failure to inspect the pump and clutches could lead to a repeat of this condition.

TSB 09-07-30-004J – Slips in Reverse or Third, Delayed Reverse or Drive Engagement, DTC P0776, P2715, P2723, Harsh 2-3 Shifts – 6L80 Transmission | 6L90 Transmission 
2006-2009 Cadillac STS-V – 2006-2009 Cadillac XLR – 2006-2009 Cadillac XLR-V – 2007-2008 Cadillac Escalade, Escalade ESV, Escalade EXT – 2006-2009 Chevrolet Corvette – 2007-2008 Chevrolet Silverado – 2008 Chevrolet Suburban – 2007-2008 GMC Sierra – 2007-2008 GMC Sierra Denali – 2007-2008 GMC Yukon Denali – 2007-2008 GMC Yukon XL Denali – 2008 GMC Yukon XL – 2008-2009 HUMMER H2 – 2008-2009 Pontiac G8
Problem – Vehicles equipped with the 6L80 or 6L90 transmission may slip when Reverse is selected or have no/delayed reverse engagement, harsh shifts from 2-3 / 4-5 or slips while in fifth, and slipping acceleration when passing. Possible DTCs include P0776, P2715 or P2723.
Solution – This transmission problem may be caused by a cracked 1-2-3-4 / 3-5-R clutch housing.

TSB 14043 – Thrust bearing failure – Allison 1000 Transmission 
2012 Chevy Silverado HD – 2012 GMC Sierra HD
Certain 2012 Chevrolet Silverado 2500HD / 2012 Chevrolet Silverado 3500HD and 2012 GMC Sierra 2500HD / 2012 GMC Sierra 3500HD trucks equipped with the Allison 1000 6-speed automatic transmission (MW7), may have been built with an incorrect transmission thrust bearing. Over time, this bearing could fail, resulting in noise and poor transmission operation.
The bearing should be replaced with GM part # 29531106

TSB PIP3598C – Intermittent ratio codes or range inhibit – Allison 1000 Transmission 
2007 – 2012 Chevrolet Silverado – 2001 – 2007 Chevrolet Silverado Classic – 2007 – 2012 GMC Sierra – 2001 – 2007 GMC Sierra Classic – 4WD Only
Problem – Drivers may experience intermittent no forward or reverse condition, the possibility of a flashing PRNDL display or a “range shift inhibited” message in the driver information center with no saved DTCs. Another possible symptom includes the following DTCs: P0729, P0731, P0732, P0733, P0734, P0735 & P0736
Solution – These Allison 1000 transmission problems may be caused by either an input speed sensor and or output speed sensor issue. The problem could also be caused by a mechanical issue inside of the four-wheel-drive transfer case like a worn bushing.

TSB 14308 – Leak at transmission cooler
2008 Chevy Silverado HD – 2008 GMC Sierra HD
Problem – Diesel powered 2008 Chevrolet Silverado 2500HD / 2008 Chevrolet Silverado 3500HD and 2008 GMC Sierra 2500HD / 2008 GMC Sierra 3500HD trucks equipped with the Allison 1000 6-speed automatic transmission (RPO MW7), may have a condition in which increased transmission oil cooling circuit pressure may cause transmission fluid to weep or leak. This loss of fluid occurs near the transmission cooler at the crimp joints on the metal ends of the cooler line where it joins the rubber hose. The increased oil cooling circuit pressure typically occurs while driving in extremely low temperatures.
Solution – Inspect and replace cooler lines if necessary.

TSB 04-07-30-018A – Ice buildup on shift cable – Allison 1000 Transmission 
2001-2006 Chevrolet Silverado 2500HD – 2001-2006 GMC Sierra 2500HD
Problem – In cold climates, it may not be possible to shift the transmission after operating it in snow, slush, or icy conditions. This is likely due to ice buildup around the shift cable-to-manual shaft connection.
Solution – Install an aftermarket transmission shield.

TSB 06-07-30-013 – Shudder in 6th gear – Allison 1000 Transmission 
2006 Chevrolet Silverado 2500HD – 2006 GMC Sierra 2500HD
Problem – Owners may experience a shudder occurs in 6th gear in 4Hi between 46 mph (74 km/h) and 49 mph (79 km/h).
Solution – Reprogram the TCM with TIS version 6.0 or higher.

TSB 08-07-30-049A – Transmission fluid leak from the ATF cooler – Allison 1000 
2006-2007 Chevrolet Silverado Classic 2500 – 2007-2009 Chevrolet Silverado 2500HD – 2007-2009 GMC Sierra 2500HD
Problem – ATF leak coming from one of the transmission cooler lines.
Solution – Replace lines with updated design: GM Part #’s 20759971 (upper), 20759972 (lower), 20759971 (hose).

TSB 10-07-30-008A – Transmission won’t shift into overdrive – Allison 1000 
2006-2010 Chevy Silverado HD – 2006-2010 GMC Sierra HD
Problem – Owners may experience a failure to shift into overdrive, or a 4-5 shift flare. Possible DTC P0777 or P0735.
Solution – Inspect and possibly replace the 3rd, 5th, and reverse clutch piston.

PIP4290A – Engine Stalling – Allison 1000 
2007-2013 Chevrolet Silverado HD – 2007-2013 GMC Sierra HD
Problem – Owners may experience stalling or surging when stopped with the transmission in gear. Possible DTC P0742.
Solution – Inspect and replace the TCC solenoid and valve inside the valve body.

Common Chevy Silverado 2500 HD Transmission Problems

Intermittent harsh shifting – Chevrolet Silverado 2500 HD 4L60E
Problem – A common Chevy Silverado transmission problem is an intermittent hard 1-2 shift, often accompanied by engine bogging. This condition can be caused by the torque convertor clutch applying during the shift.
Solution – To remedy the problem, the wiring harness needs to be inspected from the transmission case connector to the rear of the engine on the driver side. It’s possible that the wires for the TCC solenoid and pressure control solenoid have become frayed on a body seam. If this is the case, the wiring will need to be repaired, and the harness repositioned.

Solenoid DTC’s – Chevrolet Silverado 2500 HD 6L90E 
Problem – A number of diagnostic trouble codes, including P0776, P0796, P2714 and P2723, can be caused by a pressure leak at the end of the clutch regulating valve.
Solution – The bore plug will have to be replaced with updated versions, or modified to accept an O-ring kit.

Lack of Response
Leaking Fluid
Low Fluid
Burning Smell
Grinding or Shaking
Whining, Clunking or Humming
Refuses to Go Into Gear
Torque Converter Issues
Valve Body Issues
Transmission Noisy in Neutral
Gears Slipping
No 3rd or 4th Gear
No 1st or 2nd Gear
No Reverse
Dragging Clutch
Trouble Codes / Check Engine Light

Can I drive with a transmission problem?

The Chevrolet Silverado 2500 is engineered to handle almost anything, but transmission problems can stop it dead in its tracks. Even though many Silverado 2500 transmission problems start out as minor inconveniences, they can quickly escalate if you don’t have them addressed immediately. So do yourself a favor and go see a mechanic right away.

How often does a Chevy Silverado 2500 HD transmission need to be replaced?

Driving style and maintenance on the two biggest factors in how long your transmission will last. Factory design flaws also contribute to the longevity, as premature failures can often lead to the most common Silverado 2500HD transmission problems. On average, we noticed the following typical lifespans:
4L80E – 120,000-180,000 miles
6L90 – 130,000-200,000 miles
Allison 1000 – 160,000-220,000 miles

How are Chevy Silverado 2500 HD transmission issues diagnosed?

When trying to diagnose Chevrolet Silverado 2500 transmission problems, it’s important to check the level and condition of the transmission fluid. Next, an OBDII scan tool can allow you to download all of the diagnostic trouble codes, which can often tell you what’s going on with the transmission. After that, a visual inspection will need to be performed.

How is a Chevy Silverado 2500 HD transmission replaced?

In order to replace your Silverado 2500 transmission, the old one will have to be disconnected from the driveshaft, engine and frame. After installing the new one in the reverse order, the ECU/TCM may have to be reprogrammed in order to recognize the new transmission.

Recommendations for Chevy Silverado 2500 HD transmission issues?

To save time and get back on the road faster, have your 17-digit truck VIN# handy and you can get an online quote for a reman Chevy Silverado 2500 HD transmission here, then find a local shop using our Find a Shop guide to install it for you.

How to Solve Chevy Silverado 2500 HD Transmission Problems

Solution A: Buy a Used Chevy Silverado 2500 HD Transmission

One of the cheapest ways to solve most severe Chevy Silverado 2500HD transmission problems, is to simply go to the junkyard and buy a used 4L80E / used 6L90 / used Allison 1000 transmission. They are fairly easy to come by, and most junkyards will give you a 30 – 90 day warranty. However, you don’t know the actual condition of the internal components inside that transmission, which means you could be in for even more problems than you have now. Plus, that warranty probably won’t cover labor charges if you have to replace the transmission a second time.

Solution B: Buy a Rebuilt Chevy Silverado 2500 HD Transmission

A rebuilt 4L80E / rebuilt 6L90 / rebuilt Allison 1000 transmission is definitely a better option. However, most mechanics will use an OE master rebuild kit, which takes the transmission back to its stock form, and usually does not address any of the factory design flaws. This means you’ll probably have the same problems in the future. And that warranty might not cover you if you are traveling and need work done at the local transmission repair shop.

Solution C: Buy a Remanufactured Chevy Silverado 2500 HD Transmission

To keep your truck on the road for as long as possible, a remanufactured 4L80E / remanufactured 6L90 / remanufactured Allison 1000 transmission is the best way to go. Most of them are built using much higher quality transmission parts, and modifications are often performed to correct for factory design flaws. This will allow you to get a much longer service life, and the warrantees are usually much better too.

Need a replacement transmission? Get an estimate for replacement transmissions and local installation. Look up your transmission model by vehicle make and model.

What Transmission Do I Have?

What Problem Does Your Chevy Silverado 2500 HD Have?

Let us know the year, mileage and problem you’re having as well as any trouble (OBD) codes you’ve found. If you’ve been given a quote or paid for a repair, we’d like to hear about that too!

Leave a Comment


Hello iv got an 08 Silverado 2500 hd
No 4 wheel dr
Says service 4 wheel drive
Replaced transfer case from jasper
Won’t learn the truck
Now kicking self out of gear and have to place in neutral to reset
Have had transmission checked
Any suggestions?

Stephen king

Runs great no noise and very strong in all gears but reverse has nothing. No warning at all. Was driving in reverse in yard got out to move a kids ball and got back in and had nothing.

Kelly Holbrook

2001 Silverado 2500hd Duramax 4×4. PO735 and PO700. When getting on it a little pulling a hill or pulling a trailer. When it shifts down from 5th to 4th it will go into limp mode (stuck in 3rd). Have to stop, shut off, open and close door to kill electrical. Fire up and go again. 195,000 miles, EFI live tuning but there are no tunes or changes from stock done to the transmission.

Mike Scott

Hi I’ve got a 2016 2500hd 6.0. 2nd and 3rd gear pulsate/ jerk when going uphill.. I bought it used with 62k.. now has 72k. Prior owner used it as a daily and towed a travel trailer a few times a year.. I do the same. I first thought it may be maf related.. changed it with a superseded change. There was a cai on it.. took it off and I bought the stock air box parts.. still no change. I read some cases of torque converter issues.. any thoughts? Thanks, Mike

Tom Ripke

08 Silverado 2500 HD 4×4,no Drive or OverDrive,never really slipped,just quit shifting. All other gears shift fine.

Kevin Britt

I have a 2009 chevy Silverado 2500 6.0 vortec. With 121000 miles on it.
I’m getting a vibration when I put it in gear at an rpm about 600 to 700 sitting.
When i come to a stop I’m getting a worse vibration when almost to a complete stop?
Any help would be appreciated.
Thanks Kevin


I have a 2002 Chevy Silverado 2500 HD with the 4L80E transmission my instrument cluster line out shortly after that the truck wouldn’t drive the transmission appeared that it was slipping I took it to a transmission shop they said it was gone after the current transmission had been replaced 10 months prior. They said that the naff sensor was gone and the computer was badd as well. I replaced the the computer had it programmed replaced math sensor and purchased a new instrument gauge cluster. The truck runs now and drives but The speedometer doesn’t work neither does the feel gauge. Does anyone have any suggestions on what to do

Jeff W

2019 Chevy 3500HD Ltz Duramax with SnoX Power Plow. Due to front end clearance issues a 3 1/2” front 2” rear SST lift kit was installed. I’ve plowed commercial for 20 seasons but never with a diesel. First thing I noticed was the 2 to 3 additional seconds needed between shifting from from forward to reverse. My first night out I banged the transmission far more than my entire plowing career🙄😡.
I also noticed a strange smell, not diesel like. Thought it was the smell of a new truck and maybe had something to do with the DEF. I was unfamiliar with it and I wasn’t sure if that’s what I was smelling. The first night out, later in the run I started noticing it was more than the smell. And that the truck was running rough when completing a push and going into reverse. I would describe it like a race car with a full race camshaft that gives it the heavy lunging at idle. It put me on alert started monitoring the transmission temp which was getting up words of 200°- 205°.

Second night out with the truck it was much colder temps in the single digits but it didn’t change anything with the truck. It still smelled hot and had the higher transmission temperatures while plowing. And the engine temps were up about 5-10° on average (same as first night). So in between my jobs was not the problem the tranny temp actually cools down in transit and preferred to run at higher speeds.
And then it happened at 2600 miles going from forward completing a push moving backwards away from the pile it died 🤬!!! I couldn’t believe it $70,000 truck just died! never in my 20 years, and I’ve run some trucks into the ground.
So what now? Chevy is aware of the problem but they just want to ignore it! Latest GM bulletin is to put an air deflector on top of my plow making it heavier and solving nothing! Installing a deflector would not help with low speed back and forth plowing. IMO the Duramax is suffering from lack of airflow underneath. more so than the front and hood areas. I noticed when back dragging combined with tight areas with more shifting the engine and power steering pump hates it! In fact if I move the steering wheel too quickly and the engine is surging it’s like no power steering. I don’t think I should be stuck with a $70,000 truck that I love and hate! The answer is not modifying my plow if Chevy is telling me that then they need to advertise that their trucks are snow plow “specific” not snow plow ready. They’re just going to ignore it now and when my transmission lives half its life expectancy and my warranty is up….


I just changed my transmission fluid in my 2015 2500hd. Diesel. It will not engage in any gear. 103000. Any thoughts

Dale Tracy

I have a 2010 2500hd 6.0 automatic trans. I was driving down the road and came onto a slow vehicle, the car turned and as I tried to get back up to speed it had stayed in a high gear the truck never downshifted. I limped down the road to a park and ride and tried to back into a parking spot the truck wouldn’t go in reverse. Does anyone know what happened?

Boss Man

1997 C2500 with 4L80E transmission. All original with 464k miles, with the majority of those miles the truck had a 30ft duel tandem gooseneck trailer hooked behind it. Changed the transmission fluid & filter every 75K miles or so since the truck was bought new in April of 1997. Over those 464K miles I’ve never even had as much as a hiccup out of that ole 4L80E tranny. That’s a far cry from the estimated 120K – 180K mile lifecycle of the 4L80E transmission.


Sometimes accelerating delays up to 5000 RPM before it ships in the third, sometimes when you’re cruising if you punch it and then let off gas the RPMs go up to the five or six thousand and hovers there do you have to punch it again to let it kick. Also almost at 4 complete or 5 complete second delay when you put it in reverse in the parking lot you can set and count before it kicks in gear.





James johnson

My transmission said idle truck transmission is hot the I got out to check it pulled stuck out and put it back in and transmission fluid went everywhere and truck would go so towed it to a hotel parking lot been stuck here for 4 days now yesterday I got in it and gave it gas and it makes awhinny sound then it stop and truck will move a little and give it more gas same thing winny sound the it will move I have 2013 GMC 2500 he 4×4 6.0 gas can some one help me out here I need a easy fix to get about 130 miles


My 2002 6.6 Alison transmission is not shifting into low gear or passing gear

Roger Harrell

2014 Silverado 3500 SRW, 27,000 miles. Transmission surge when shifting at low rpm. Tach will step when shifting, as if climbing stairs. Seems to go away at 2k rpm or more. Is this torque management, or trans issue? Did not do this when first purchased at 14k miles. Seems to be worse when air condition is on, or truck is under load at low rpm. Very annoying. I just desire a smooth trans shift, without surge jerk. Above 2k, trans seems to shift fine.


I have the same exact issue however I have almost 200k miles. Did you get it fixed? If so, what was needed?