Designed to be a more stylish and upscale alternative to the 3/4 ton trucks from Chevrolet, Dodge and Ford. The GMC Sierra 2500 HD came equipped with the 4L60E transmission, 4L65E transmission and 4L80E transmission in early models. Later models got the 6L90 6-speed transmission, and the GMC Sierra 2500HD 6.6L Duramax Diesel had the Allison 1000 transmission. But they aren’t without their problems though, so let’s look at some of the most common GMC Sierra 2500 HD transmission problems, look at cost estimates and figure out what you can do about them.
What Transmission Do I Have?
GMC Sierra 2500 HD Transmission Models
GMC Sierra 2500 HD: 4L60E Transmission
GMC Sierra 2500 HD: 4L65E Transmission
GMC Sierra 2500 HD: 4L80E Transmission
GMC Sierra 2500 HD: 6L90 Transmission
GMC Sierra 2500 HD: Allison 1000 Transmission
GMC Sierra 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 GMC Sierra 2500 HD Transmission Prices:
| Transmission | Street Smart Transmission |
|---|---|
| 4L60E / 4L65E | 2100 |
| 4L80E | 2256 |
| 6L80 / 6L90 | 2559 |
| Allison 1000 | 2478 |
What are the DTC codes related to GMC Sierra 2500 HD transmission problems?
| Trouble Code | Description |
|---|---|
| P0711 | Transmission Fluid Temperature Sensor Circuit Range/Performance |
| P0712 | Transmission Fluid Temperature Sensor Circuit Low Input |
| P0713 | Transmission Fluid Temperature Sensor Circuit High Input |
| P0714 | Transmission Fluid Temperature Sensor Circuit Intermittent P0715 |
| P0715 | Input/Turbine Speed Sensor Circuit |
| P0716 | Input/Turbine Speed Sensor Circuit Range/Performance |
| P0717 | Input/Turbine Speed Sensor Circuit No Signal |
| P0718 | Input/Turbine Speed Sensor Circuit Intermittent |
| P0720 | Output Speed Sensor Circuit |
| P0721 | Output Speed Sensor Circuit Range/Performance |
| P0723 | Output Speed Sensor Circuit Intermittent |
| P0729 | Gear 6 Incorrect Ratio |
| P0730 | Incorrect Gear Ratio |
| P0731 | Gear 1 Incorrect Ratio |
| P0732 | Gear 2 Incorrect Ratio |
| P0734 | Gear 4 Incorrect Ratio |
| P0735 | Gear 5 Incorrect Ratio |
| P0740 | Torque Converter Clutch Circuit Malfunction |
| P0741 | Torque Converter Clutch Circuit |
| P0742 | Torque Converter Clutch Circuit Stuck On |
| P0744 | Torque Converter Clutch Circuit Intermittent |
| P0748 | Pressure Control Solenoid 'A' Electrical |
| P0750 | Shift Solenoid 'A' |
| P0751 | Shift Solenoid 'A' Performance or Stuck Off |
| P0752 | Shift Solenoid 'A' Stuck On |
| P0753 | Shift Solenoid 'A' Electrical |
| P0755 | Shift Solenoid 'B' |
| P0756 | Shift Solenoid 'B' Performance or Stuck Off |
| P0757 | Shift Solenoid 'B' Stuck On |
| P0758 | Shift Solenoid 'B' Electrical |
| P0767 | Shift Solenoid 'D' Stuck On |
| P0776 | Pressure Control Solenoid 'B' Performance or Stuck Off |
| P0777 | Pressure Control Solenoid 'B' Stuck On |
| P0796 | Pressure Control Solenoid 'C' Performance or Stuck off |
| P0850 | Park/Neutral Switch Input Circuit |
| P0897 | Transmission Fluid Deteriorated |
| P0965 | Pressure Control Solenoid B Control Circuit Range/Performance |
| P0966 | Pressure Control Solenoid B Control Circuit Low |
| P0967 | Pressure Control Solenoid B Control Circuit High |
| P0973 | Shift Solenoid A Control Circuit Low |
| P0976 | Shift Solenoid B Control Circuit Low |
| P0977 | Shift Solenoid B Control Circuit High |
| P0979 | Shift Solenoid C Control Circuit Low |
| P0980 | Shift Solenoid C Control Circuit High |
| P0982 | Shift Solenoid D Control Circuit Low |
| P0983 | Shift Solenoid D Control Circuit High |
| P0984 | Shift Solenoid E Control Circuit Range/Performance |
| P2715 | Pressure Control Solenoid D Stuck On |
| P2723 | Pressure Control Solenoid E Stuck Off |
GMC Sierra 2500 HD Transmission Recalls
None Found
GMC Sierra 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 GMC Sierra 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 – GMC Sierra 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 GMC Sierra 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 GMC Sierra 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 GMC Sierra 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
Problem:
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.
Solution:
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 Problems with the GMC Sierra 2500 HD Transmission
Intermittent harsh shifting – GMC Sierra 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 – GMC Sierra 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?
If your GMC Sierra 2500 HD can still make it up and down the road, you might say “It’s fine, I’ll just drive it until I can get it fixed”. But that is not always a good idea, depending on the symptoms. You see, there are a lot of (very expensive) moving parts inside of a transmission, and if something isn’t right, continuing to drive with a transmission problem could damage something else.
How often does a GMC Sierra 2500 HD transmission need to be replaced?
The overall lifespan of a GMC Sierra 2500 HD transmission largely depends on how well it was maintained. Factory design flaws also factor into this equation, along with how/how hard you drive. But on average, we’ve seen the GMC Sierra 2500 HD transmission last for between 130,000-180,000 miles. A high quality replacement transmission however, can last considerably longer if all of the factory design flaws have been addressed and the vehicle has been maintained.
How are GMC Sierra 2500 HD transmission issues diagnosed?
It is fairly easy to guesstimate what the root cause of your GMC Sierra 2500 HD transmission problems might be, but you won’t truly know unless you have the right tools and experience. A good mechanic or transmission repair center will be able to connect your truck to a computer and find out which diagnostic trouble codes (DTC’s) have been stored. Once they know what to look for, they can perform a visual inspection to verify the problem.
How is a GMC Sierra 2500 HD transmission replaced?
In order to replace your GMC Sierra 2500 HD transmission, the truck has to be lifted from the ground in order to gain access to all of the parts that will need to be unbolted. Then the transmission can be lowered to the ground (typically with a transmission jack), so the new transmission can be installed. Once it is in place, for the 6L80, the vehicle PCM will have to be reprogrammed / reflashed to accept the new transmission using the latest GM subscription.
Recommendations for GMC Sierra 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 GMC Sierra 2500 HD transmission here, then find a local shop using our Find a Shop guide to install it for you.
How to Solve GMC Sierra 2500 HD Transmission Problems
Solution A: Buy a Used GMC Sierra 2500 HD Transmission
The quickest way to fix your transmission problems is to simply buy a used transmission or used transmission. These can be found at most junk yards, and they often come with a 30-90 day warranty. However, there’s no way to determine the actual condition of the internal components, so you could be spending a bunch of money to have the exact same problems. Plus, that warranty only covers the transmission if it’s defective, not the labor costs that you’ll have to pay.
Solution B: Buy a Rebuilt GMC Sierra 2500 HD Transmission
Another option would be a rebuilt transmission or rebuilt transmission. A local repair shop will remove your transmission, then install a bunch of new parts during the rebuild. The problem here is, the skills and experience of each transmission rebuilder will vary widely from shop to shop, so you could have problems from something that wasn’t adjusted properly. And the 1-2 year warranty might only cover you at certain transmission repair shops, in a specific geographical area.
Solution C: Buy a Remanufactured GMC Sierra 2500 HD Transmission
Many owners depend on their vehicle to commute and get things done. Their gasoline engines are designed to go 100’s of thousands of miles, so it makes sense to invest in a remanufactured transmission.
What Transmission Do I Have?
What Problem Does Your GMC Sierra 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!
99 GMC Sierra 2500 4×4 v8 6.0 364cc slt
3 door extended cab
I had the GMC dealership remove my transmission (4l80e) and replace it with a remanufactured one after having a couple minor issues. I don’t recall having transmission problems at that time. It costed 4800$ for this work. 3 year/1000,000 mile warranty. It’s been 12 months or about 20,000 miles now. I noticed 4 leaks a couple weeks after work was done that were not there before. 2 of them dinner plate sized, 2 half that diameter. I was back at home 400 miles from dealership at the time I noticed and scheduled to be there for 3 months. I started to take down the front differential, exhaust system, etc to replace the oil pan gasket and see if I could find any problems. I did not remove the transmission. (I still don’t know if the rear main seal is to blame for one or more of the puddles). I have a noise coming from the middle of the vehicle when shifting up and when starting in the morning, sometimes, that sounds like a trumpet or growling. It goes away when it shifts and rms settle, but I can make the noise prolonged if want to by giving just shy the gas needed to actually shift. There is a substantial amount of fluid leaking around the torque converter/ bell housing area that makes its way to the catalyst converter, exhaust pipes, transmission pan, starter motor and passenger side of frame. Can you guess at what the problem might be ? Can you guess at what i can personally do to mitigate or solve issue ? Without, of course, voiding the warranty.
Thank you
Pulled my boat 200 miles and transmission all the sudden started slipping went to check the fluid and the dipstick tube was broken off
No oil under the truck
When it’s cold it will drive and shift fine until it’s hot. When hot it starts to act like it’s slipping in and out of all gears. Then it will lose everything. I can put it in park, shut it off, and hit the transmission pan towards the front with a rubber mallet. Then it while drive fine for a while then start the whole process all over again. Also only in first gear it has a whining sound almost like the rear end is going out but its coming from the transmission.
Locked between gears and can’t pull RPMS UP.
2500 CHEVY 6.0 ENGINE. TRANS LUGS ENGINE DOWN IT LIKE IT IS STUCK BETWEEN FORWARD AND REVERSE GEARS
Rpm really high when shifting feels like you are in trailer mode only rpm even higher thirty five hundred or four grand
same
Drive shaft yoke comming out of transmision broke and also broke transmission case
I’m told my 2007 GMC Sierra 2500HD Classic (Duramax Diesel/Allison Tranny) transfer case has a hole in it due to a pump rubbing against the case. This is apparently a common problem. My GMC dealer says it cost just under $1700.00 to fix. I wonder why GM didn’t offer up a service bulletin on this issue or a recall, if it’s, in fact, a common problem. Should I ask GM to pick up at least part of the bill if this is a common problem with an easy fix? I just don’t know. Thanks to all.
It hard shifts when tranny temp gets hot . It’s an 06 GMC Sierra 2wd 2500hd with the 6l80 tranny. I’ve been told that the p0894 code comes up .
Three months ago , a rat ate through 17 wires that affected the engine starting and other electrical problems affecting the tranny causing it to hard shift. Paid $600 to have wires reconnected and that’s when the hard shifting started , with an engine light on.
I have been told by two independent shops and the local gmc dealer , that it’s the torque converter and found excessive TCC slip speed. Suspect internal torque converter or valve failure.
I changed my tranny fluid , filter , magnet which all looked great , with great color , no shavings , leaks or burnt odor one month ago. Also changed engine oil & filter.
Oh yeah , this truck has 115,800 original miles .
I have used it for towing but nothing over excessive.
For some reason , I can’t help but think it’s a sensor , a solenoid , or something less than a new tranny for $4000.00
Kinda stressed as to what to do or think.
I have a 1991 GMC sierra 2500 with a 454 big block and a 4L80e transmission. So all the drive gears work/shift fine, but the cannot get into reverse. What’s my issue? Also will a 1979 th400 trans bolt up to 1991 454?
I have a 2017 Sierra 2500 HD 6.0 gas 4×4 z71 6 speed. When going into 3rd hear it bogs down and it’s very similar to a misfire but I know its the torque converter. If i use the manual setting and keep the rpm’s up it will run fine. Going up hill or when it’s raining is almost scary because it just won’t hardly go.
I still have warranty left. The rear end has already gone totally bad and had to be entirely replaced. As soon as the rear end was replaced, this issue started. I’ve only towed two trailers with this truck. Very light trailers. Could the bad rear end have caused the TCC to go bad or even destroyed my Transmission?
Taking it in Monday October 7th. I’m sure I’ll get the, TSB flush it 3 times, runaround. The dealership knows about the issue because they mentioned it too me just after I complained when my rear end went out. But without a code they didn’t flush the tranny then. that was at 45,600 miles. They can tell by the fluid I don’t tow anything. Here’s hoping they get it fixed. I bought this truck thinking it would last 10 years. It didn’t get to 45,700 and the rear end fell out of it! I don’t like using the F word, and I can buy any F-150 at 5k under invoice. I may have to rethink my loyalties after this one. We’ll see.
I have a 92 gmc sierra 2500, 454. My service engine soon light is on, so I can’t do self diagnostic check, because it won’t flash. Can ir be checked at a shop diagnostically?
My tranny wont shift into 2 n 3rd gear..fluid is good
I have a 2010 GMC 2500 HD 4 x 4 6.0 gas I let the battery go completely dead when I jump started the truck in the morning now the trans wont shift trams had supposedly been previously rebuilt service center message States check trailer brake any ideas?
I have a 97 gmc 2500, tranny started acting funny then it just stopped moving. I can shut truck down and restart it and I have good tranny for about 30 seconds then it’s gone, repeat shutdown and startup and same thing. any ideas?
Torque converter
Hi.I towed with a faulty transmission and overheated it. Then had it overhauled. Now it runs fine with no load but when towing up long grades with a 6000-8000lb trailer it will overheat. Almost 300 degrees if I don’t stop. I have bypassed radiator and added a second auxiliary cooler and still overheats. Any suggestions. Thanks John 2001 gmc 2500 hd 4l80e
sounds like a bad torque converter to me.
My 2004 Colorado I was driving down the interstate the other day truck stop pulling transmission will not take any gear like it’s inneutral in all gears
04Chev Sierra 4X4 hd 2500 pickup when put into reverse hear it shakes bad and stalls
My 04 gmc 2500 with the 6.0 in it won’t move in reverse but the forward gears are fine changed fluids and filter still doing it
Mine too
Mine to it’s a 2002.We brake torque it to get it to go into reverse.
My 04 GMC 2500 is doing the same. I went to put it in reverse and Felt a very light pop:-
When I shifted lever into reverse….Pretty much felt what I would think a band snapping would feel like …… I appear to have all forward gears.
Did u get the answer You needed: I think my reverse band I has snapped.
Wont drive in D. For about 5 minutes, then worked. Rear back up camera did not work along with some lights on dash .
At 70 mph I get a #7 misfire code, at 4000 rpm the engine begs and will go no faster, ONLY in drive. This does not happen in any other gear or neutral.
The truck is a 2001 GMC 2500hd with a 6 liter vortec. 250000 miles. Only throws misfire codes in Drive going about 70 mph. Only bogs down in drive at 4000 rpm.
I have 2004 GMC Sierra 2500hd 164000 miles on it . My trainsmission started to over heat the temperature gage Shows it gets to 300 after you drive in about 20 miles. When you put it in reverse it Begins to stall and lose power Dies out . I don’t smell anything burning speed is fine with driving all the gears work no transmission light on