Allison 2500 transmission problems Stall speed is the speed at which the torque converter limits engine speeds. After playing with the linkage and anything else I could get my hands on I got back in Jan 25, 2010 · P0700 Transmission Control System (MIL Request) When I read the codes the other day, the same codes were present and there was also an EGR low flow code. (Assuming Stock injectors) Stealth 64 G2 Turbo. Yesterday, while "leaving a light", something "burped", a my "check engine Light" came on, and the transmission quit shifting. It says drive with care meanwhile Nov 15, 2024 · The problem: affected diesel-motivated Chevy Silverado, Chevy Tahoe and Chevy Suburban units are subject to a condition in which the transmission control module software is unable to detect problems with the pressure in the transmission, causing the control valve to fail. The shift selectors were also re-designed. Give a few seconds in between gear changes to fill the associated areas. But understanding what could be wrong and then determining what would be involved to get it repaired (or if it even makes sense to try to get it repaired instead of swapping it out for a re-manufactured transmission), is what this article is all about. Would like to have anyone's thought that might have some knowledge on Allison transmission. Today on the way home from work I got on it kinda hard and at about 60mph it felt like the trans was slipping. The problem seams to be getting worse, last weekend it took a number of D to N shifts to get the Apr 25, 2024 · My worktruck is a 2020 Silverado 2500 HD with the new 6. I have a 2011 Silverado 2500 HD. GMC Savana 2500-3500 [2010-present] Chevrolet Suburban 1500 [2009-2020] Allison 4000 Transmission Problems. I also,,, changing the wording multiple times, on what transmission is in the 2024 6. Between 2-3 and 3-4 shifts, there would be a hesitation in the shift. After WWII, GM turned Allison Transmission loose on civilian transportation. Stock truck except exhaust. As a result, the LCT1000 can be found in vehicles ranging from pick-up trucks to motorhomes and dump trucks. I have just noticed a delayed clunking coming from underneath towards the rear ( I think) when I am backing up fairly slow then come to stop. The transmission fluid looks like normal transmission fluid and smells very bad. GM 10 Speed Transmission Problems and Solutions. Each Allison DOC software program requires a separate valid subscription license to activate the Nov 27, 2016 · Traded off-'05 Chev, 2500HD, CC, SB, Duramax, Allison, 4WD, bought new April '05, sold at 179,400 miles, LBZ mouthpeice, Blocker Plate & Unplugged EGR, Air Box cut out, lost the cat, 52 US Gal (196 Litre) Titan Fuel Tank, SuperChips tuner reset to stock and retained, AirLift air bags, BrakeSmart Trailer Brake controller, PaceEdwards cover Dec 6, 2024 · just a quick thought, how many of you knew that the 10speed tranny in all the hd trucks 2020 and newer is a tranny that gm and Ford came together and made, it's NOT an allison, is was made under the allsion license giving gm the right to call it an allison, hence all the transmission problems that everyone is having is from a POS that theyre In this Drivetrain 101 article, we analyze, opine and educate about the Allison LCT 1000 & 2000 Transmission; from its unique Adaptivity Protocol to its various problems, solutions and upgrades. In this comprehensive guide, we delve into the intricacies of the Dodge 2500’s transmission system. Today I received a call from the dealer and they said that GM corporate had said that the few cases that they had seen with these symptoms had been caused by the transfer case. Been worked on 2 times. now costumer is complaing that is stalling in drive and unplug trans. FASS Lift Pump. Remember that the transmission fluid comes in different types. There is a lot of chatter out there abo Feb 5, 2018 · 2003 Crew Cab LT 6. Estimated time anywhere between one week and 3 months lol. Immediate Steps: Nov 8, 2022 · They just need to be fixed or redesigned so that the transmission work is even better. Jul 22, 2017 · Truck is a 2003 GMC Sierra 2500HD. Looking for a Sep 13, 2024 · Problems with the 10L1000 Allison transmission. EFI Live by Idaho Rob, 695K+ and rolling, Undercover Bed Cover, Vortex spray in bed liner, Odyssey Extreme Batteries, Westin steps, Bilstein Shocks, Road Master Active Suspension, M/A Pump Rub Kit, PPE Trans Cooler, PPE 3" downpipe, MBRP 5" Exhaust, Edge Insight CTS, K&N drop in filter, AirDog II 100 w/ CAT 751, LLY FF Housing, Running on LMM Oct 14, 2024 · Silverado 2500 HD; Silverado 3500 HD The issue affects both Allison-branded 10-speed Their shop manager said they had received a bolo describing this problem w/this transmission. 6 gasser, and the same pops up the 10L1000. 6 billion | Reuters GM uses higher capacity transmission in the HD's than in the 1500s. Maybe a software update, not sure what year that was, dont care, its not notable. My personal truck is a 2007 GMC Sierra LBZ CCSB 4x4 with HSP piping, Danville 68stage2r turbo, PPE manifolds and up-pipes, Limitless 1078 TC, Stock trans with Trans Go Jr. The do same with the other connector. The TCM is responsible for regulating gear changes, so any issues with shifting may be related to a faulty TCM. 0L duramax ir you’re currently towing your trailer with a suburban. 07-11 Jan 1, 2023 · Allison Transmission Forum: 3: 06-24-2020 11:32 AM: Allison 2500 MH Shift by Wire Problem: Monty2017: Allison Transmission Forum: 0: 07-18-2019 09:57 AM: Allison 3000 Failure to Shift: jroan: Allison Transmission Forum: 4: 12-04-2015 08:30 AM: Shift or Not to Shift: BigAWB: Class A Motorhome Discussions: 30: 09-05-2014 06:47 PM: To shift or not Apr 27, 2025 · New 2025 2500 300 miles needs valve body. 2002 2500HD 8. They also share most or all their stuff with the Allison 2000 put in med duty buses as well. The Allison 10-speed automatic transmission was introduced separately in 2020 as the 10L1000 or Allison1000 transmission. The 2500 has a higher GVWR/GCWR , both are externally shifted as opposed to the 3000/4000 series fully internal electronic shifting. May 11, 2013 · If you can get comunications to the tcm then it may have just a corroded speed sensor connector which will give you codes. It is NOT in tow/haul and the exhaust brake is NOT engaged but the trans will shift down on its own and the engine will rev up to 2500 rpm or higher. Reply Oct 9, 2024 · I was just curious if anyone would maybe be able to tell me what would be the issue and or if they’ve had this same problem… I have a 2017 gmc sierra 2500 engine and transmission tuned/deleted, whenever I try to put it in reverse it will catch the gear and roll back like it wants to go, but whenever I give the truck some throttle R (reverse Dec 18, 2014 · Well, this is interesting. Eventually, if transmission service is delayed, the transmission will fail. 6L with Allison Transmission. AEM Brute Force Diesel intake. Truck has 93k miles on it. I recently deleted my L5P duramax with the Allison Transmission. So here are common 6L90 transmission problems and ways to fix them. Let discuss. As I’d be slowing to a stop there would be an occasional sensation like the brakes slightly released. If fluid drips out the level is ok. Please check your engine and transmission info . Aug 21, 2022 · Hey guys! I hope you can help me out. 2025 2500 HD with a transmission leak. Common 10-Speed Allison Transmission Problems Allison Automatic Transmission Troubleshooting Guide 3 echoes in the depths of readers souls. May 1, 2024 · 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. On a recent road trip, no load, i started having some tranny issues, once the tranny got good and warm. Jan 5, 2025 · GMC Transmission Problems Specifically: The Most Common 2021 GMC Sierra Issues. Truck has appr 450 miles on it. Aug 5, 2023 · If you happen to own a 2009 through 2015 GM truck and have not experienced a Transmission Control Module (TCM) failure, congratulations. The facts: Driving normal at slow speeds (City road) when check engine came on. It's actually a great design, aside from the conformal coating intended to "protect" the electronics. One, there is a problem with the air intake. Too bad to. 2009 chevy silverado 2500hd duramax with allison 199k miles at Diesel mechanic every 6k for maintenance. Go with the 3000 (world Transmission) and you cannot go wrong. Dec 20, 2024 · When they did this, GM retained the plant that made the transmission for the pickups. Become an Allison expert with this publication! The problem is that we have all forward gears and reverse but when you get to approximately 40 mph the check transmission light comes on, but does not go into limp mode and does not have any kind of code. Got an '05 Frlt Columbia with a Mercedes and an Auto- shift trans. So, If you do not know which fluid is suitable for your transmission system, consider going through the operator manual. Some owners also reported valve body and water pump issues, which are rare. A common 6L90 problem is the inability of the reverse gear to engage when selected. It states that the Allison transmissions require a TCM programming modification if the truck is left in temperatures of -40C (excluding wind chill) for extended periods of time (ie: overnight). Allison engineers designed, developed, and manufactured the world’s first automatic transmission for heavy-duty vehicles: city buses… locomotives… and delivery trucks. After the noises that came out of the transmission I hope that the transmission valve body will fully fix the issue. Jun 9, 2020 · Allison spec sheet gives 2100 MH and 2500 MH the same specs as far as input HP / Torque . Aug 6, 2023 · 03 chevy 2500hd duramax. Finally, in November 2023, at 147,000 miles the transmission was Feb 3, 2021 · Yes because they went to a 10sp GM built Allison tested transmission. Sep 9, 2022 · Transmission Hesitates: mrcat: Ford Motorhome Chassis Forum: 4: 10-23-2019 08:46 AM: Allison 2500 versus Allison 3000: JShireman: Class A Motorhome Discussions: 20: 04-15-2018 05:49 PM: Transmission wont shift into Reverse: justinnine: Workhorse and Chevrolet Chassis Motorhome Forum: 3: 04-12-2014 08:28 AM: Allison 1000 Won't Shift into Reverse Aug 2, 2017 · All, 2017 2500 HD LTZ with 8200 miles bought new in February. Allison had a 9spd set to go into the 2020 model Apr 13, 2018 · Because of the 33,000 lb combined limit of the 2500, heavier bodies coaches typically get lower towing limits, but if the coach itself was light enough, say 23,000 lbs, then the 2500 would be rated to move it plus a 10,000 lb trailer (33k total). It is equipped with a thick front grille, built-in ladders on both sides of the bed, a variety of trim and equipment options, and several powerful engine options. 3 L produces , even the ISB has to be torque limited to be used with the 2500 . I would also highly suggest looking at a 1500 with the 3. Aug 4, 2023 · 06 LBZ 2500 350,000mi 09 LMM 3500 Cutaway 700,000mi 22 L5P 3500 DRW. Mar 21, 2018 · It certainly could be a wiring problem, but it could be either. I have reset the truck to stock for the time being. Jul 4, 2023 · Allison 6 Speed Transmission Problems with Solution: There are 5 major Allison transmission problems. Allison 4000 and Allison 6-speed transmission share Aug 6, 2023 · 03 chevy 2500hd duramax. After it was deleted the transmission stiffs really bad under normal conditions. 2001 Chevy silverado 2500 HD, looking to buy a camper and tour 47 National parks. I was pulling through an intersection two weeks ago and the truck lost forward momentum (engine RPMs increased, but no acceleration). Which of these potential problems apply to your situation? Limp mode (Allison 1000 model) Hooked up incorrectly; TCM module problem; 1) Limp Mode (Allison 1000 Model) The Allison transmission 1000 model has a feature called “limp mode”, in which the transmission locks itself into Sep 6, 2012 · Justin 2001 LB7 Silverado 2500HD LT CCSB 4x4. 2 weeks ago I got in the truck to shift into reverse and it came up shift inhibited. AW139Driver. After about 100 feet forward momentum engaged. Nov 13, 2024 · GM recently decided to recall nearly half a million full-size trucks and SUVs with diesel engines due to a transmission valve problem. There are no accumulators in the allison and with the design, that being a transmission that uses no sprag clutches or bands, shifting is 100% dependent on the transmission control module and the trim valves to adjust the timing. The transmission was designed well before he retired Jul 31, 2011 · This is unbelievable- but I'm in Love's truckstop, south of Milwaukee. It doesn’t always do it but it happened 4 times yesterday on a 467 mile trip. They are refreshing in comparison to the other recent experiences. Fresh transmission fluid doesn’t smell bad. 0 3500 DRW Allison 1000- Sold🥲 Jul 3, 2023 · Might be a dumb question but entertain me. The problem is a little less urgent now, as I have given up on getting this truck back on the road anytime soon. We have 1 Allison Transmission 2500 PTS Automatic manual available for free PDF download: Service Manual Allison Transmission 2500 PTS Service Manual (27 pages) Brand: Allison Transmission | Category: Microphone system | Size: 0. Especially in 4th gear it won’t down shift right away and it won’t up shift. 157,000 now I start to have problems. First of all, disconnect and reconnect one connector, then see if problem is fixed. Reply Jan 16, 2012 · Allison Transmission - Any problems? Jump to Latest 2021 LM2 CC std box 4x4 ; '18 2500 L5P CCSB 4x4; '11 LML, '10 LMM and 04. 2-3 and 4-5 started flaring (shifting into neutral between shifts) and then bangs into gear pretty bad, Also some downshifts are banging into gear Integrated Diagnostics: Allison DOC ® (Diagnostic Optimized Connection) is a Windows-based diagnostic tool that allows users to troubleshoot and service Allison electronically controlled commercial transmissions and transmission control systems. and Allison 1000 Transmission Problems [05 Problems and Solutions] Allison 1000 transmission has 5 common problems, including the torque converter, TCM module, shift selector shifting problem, limp mode, and installation issues. Now the transmission control box will stay lit but the when you press the gear selector it won't shift out of neutral. Thread 2025 2500 HD with a transmission leak. Allison TCM Problems: What Goes Wrong Aug 4, 2015 · Chevrolet Silverado 2007-2013: Transmission Problems and Diagnostics. Basically get the transmission up to temp. 2100 listed as close ratio the 2500 wide ratio. 6 diesel and 6. Save Share Oct 18, 2019 · However, you may actually be experiencing a failsafe instead. I believe this Allison brochure is accurate for circa 2005 (later years of 2500 have higher ratings). 2024 2500hd LTZ and I purchased on 09/16 Had an alignment the next week to center the steering wheel and 2 weeks later the check engine light came on with code P-0422 emissions exhaust. 2500 and 3500 HDs, as well as the Chevy Tahoe/Suburban Jan 16, 2012 · Allison Transmission - Any problems? Jump to Latest 2021 LM2 CC std box 4x4 ; '18 2500 L5P CCSB 4x4; '11 LML, '10 LMM and 04. Nothing notable popped up. When the "Range Shift Inhibited" state occurred, it threw codes: P0700 (Transmission Control System (MIL Request)) P0843 Transmission Fluid Pressure Sensor/Switch A Circuit High Oct 5, 2024 · Signs of Allison Transmission Control Module Problems Shifting Issues. I am having the same issue with the light under the "D" will stay there while the truck is cold, and the truck will shift gears without issues. 1990 Richard P Acker Table 1 6 Allison Four Speed Automatic Transmission Troubleshooting Chart Pages 1 through 4 Continued Table 1 6 Allison Four Speed Automatic Transmission TROUBLE Rough shifting Continued Engine Oct 14, 2024 · Interesting, I have heard nothing. 07-15-2024 03:52 PM by SafariBen. Check for leaks and keep the fluid topped up for better shift results. Mar 26, 2025 · Stay vigilant and proactive about your Chevy 2500’s transmission health. The transmission relearn should be free if under 36,000 miles. There could be a pin contact problem between the looms and the TCM. Passed some slower movers and have been passed by faster rigs. 300 hp, 600 ft lb torque, MH2500 five speed transmission without any problems. Dave6. Recognizing the signs early can save you time, money, and a whole lot of headaches. Jul 7, 2023 · Common Chevy Silverado 2500 or 3500 Transmission Problems . You should be able to get Park/N, Reverse, and 3rd. If the transmission is slipping, repair as needed. Change the spin on filter every 10K. The only change was replacing the 6spd Allison with the 10spd 10L1000 Ford trans. 6L gasoline engine. I bought a 2015 Chevy 2500 HD a month and a half ago and have 4300 miles on it. May 13, 2022 · Their new transmission combined range change, steering, and braking – a revolution in its time. If not the problem is hydraulic in nature. Difference included: More sensors, more diagnostic capabilities, and advanced configurations of the Allison Oct 9, 2024 · GMC AT4 HD Problems and Issues . Married. Some key points include: Approximately 15-20% of owners report experiencing transmission problems within the first 100,000 miles. They have logged millions of miles behind the 6. Reply Dec 22, 2022 · At the front of the transmission pan is a 10mm head plug. common issue fix with the allison 5-speed tcm. Aug 19, 2022 · However, like any vehicle, they are not immune to issues, particularly concerning their transmission system. Shift Selector Problem; One of the most common issues with GM's 10-speed Allison Transmission Forum Problem with gearbox allison 3060. Nick Priegnitz, CEO of DuramaxTuner, discusses the 10-Speed Allison Transmission found in the 2020+ 6. check the wiring to the tcm first. Similar problem I had with a 2018 Denali Mar 8, 2013 · We have two, 2500's with 125,000 on each of them. GASTONFF. May 4, 2021 · I have a 2020 Chevy LTZ 4x4 with the 10 speed Allison. Jan 8, 2024 · Just recently purchased a 2024 Silverado 2500 HD with 6. It wouldn't shift into any gear. 6L Duramax Turbo Diesel with an Allison Transmission. It limits the power transferred to the Dec 2, 2007 · 02 2500 HD 4X4 Big head waste gate controller, Van Aaken hot box, aero muffler. Frequency of Transmission Problems. There are 3 of them on top the tranny. Well there you have it: the most likely causes and possible cures for the most common problem plaguing the Allison LCT1000 transmission: inhibited shifts or gear ranges. They went through the drivetrain and dropped the transmission pan, but found no cause. Not the fastest up the hills but pulled them all comfortably and reliably. Jun 22, 2022 · The inferior stator in the Silverado and Sierra HD transmission Allison 10L1000 10-speed automatic transmission for GM Duramax applications | GM. so, my allison COMPLETELY out of the blue one day started showing all kinds of weird symptoms. After shifting from drive to neutral a couple of times it is fine for the rest of the day. Allison 1000/2000 series transmission technical tips T he Allison world series transmissions models 1000,2100,2200,2400,2500 models and variants are found in large variety of truck chassis and busses. Went to a well respected diesel shop to ask about these issues. on staff when they sold Allison. This procedure is completed in the service stall and no vehicle driving is required. Was about a mile from home. Mar 2, 2005 · Allison 2000 Transmission Problems New Topic Reply to Topic Printer Friendly: Author: Topic : RTP717 New Member. Acceptable full-load engine governed speed: 2200 – 3800* rpm; Acceptable engine idle speed range (with transmission in drive): 500 – 820 rpm This is a complete overview and analysis of the problems that plague the new 2020 and above 10-Speed Allison Transmission found in the new Heavy Duty DuraMax diesel trucks! Read more to discover the problems and solutions of this transmission. TFLTrucks noted that the L5P went from the best mileage of the big three in 2019 to the worst MPG in the 2020 model year. Almost feels Nov 15, 2009 · 2002 GMC Sierra 2500 HD Crew Cab, Short Bed, Duramax Diesel, Allison 5 Spd, 4X4, Line-X bed liner, Westin 3" SS Platinum step bars, American Racing Mojave 16" x 8" wheels, BFG T/A KO LT285/75R16E, Rough Country leveling kit & extended nitro shocks. (ATS Transmission Stage 2) 223000 miles. Allison 1000 trans, 8. I too am new to diesels. 69 MB Mar 24, 2016 · Usually, it throws codes relating to the transmission solenoids. Apr 28, 2023 · For me, the easiest way to detect Allison 3000 transmission problems is through smell. The rpm would keep increasing but the truck would not accelerate for a split second. This last time, it threw codes for trans fluid pressure sensor circuits. Oct 18, 2019 · TCM module problem; 1) Limp Mode (Allison 1000 Model) The Allison transmission 1000 model has a feature called “limp mode”, in which the transmission locks itself into third gear. Here’s what happens. While it has proven to be Nov 30, 2018 · This includes oil and filter monitoring, and transmission health monitoring. I have an 07 Neptune with a 6 speed Allison 2500 trans and 5. 6L Duramax diesel and 8. They tried to convince me to keep my 06. First i over haul it , left work great came back torque converter had come apart cleaned up and put a rebuild converter and left. Identifying the Causes of Transmission Issues in Your Chevy 2500. EFI Live DSP5 ECM Tuned (TCM Stock). If you’re experiencing transmission problems with your Chevy 2500, understanding the root causes is crucial. pdf 9/30/05 8:46:29 AM Like other components, there 6L90 transmission was plagued with several issues, which is almost the same as the 6L90e transmission problems. Allison Generation 4. Two, there is a problem with the transmission fluid. Chevy Silverado’s and its transmissions are known to have quite a few problems and it’s actually the most common problem their cousin, the Silverado 1500. Nov 2, 2009 · 2007. When drivers attempt to change gears, they may Oct 17, 2020 · Check transmission operation; if it seems to be working properly, check the appropriate sensor inputs. They are very similar to the Allison 1000 - 5speed put in GM trucks 2001 - 06as well. For the last several hundred miles I've noticed that every time I take off in the truck, within a couple minutes of driving it makes a weird noise that almost sounds like a very faint ABS sound. Is the GM 10-Speed Transmission an Allison? No, the GM 10-speed transmission is not an Allison. Posted - 03/02/2005 : 6:51:31 PM Sep 17, 2012 · 2011 allison tranny problems:help 2011 Chevy Duramax 2500, On cold mornings the transmission will not shift into drive, shift inhibit is on the display. DRIVETRAIN INTERFACES. Nov 22, 2009 · 2007 gmc 2500 with allison 2000 stalls when i put in drive and reverse. My issue happened 11/12/18 while driving home from work. You have an Allison 1000 - 6 speed in your truck and very little has change with them from 2006 to present. USA 9 Posts. An Allison is quite literally the hands down best transmission in the 2500 and up. Was unable to get a recurrence, but took it to the dealer anyway. The allison software has all the allison pinouts in it and you can get all the wiring diagrams off isis bus schematics. ), then having the dealer do a transmission relearn. 1L gas motors. They make up the ratio difference in the trany so they are actually not going backwards at all. Jan 8, 2015 · Mid-year 2015, roughly after August 2014 build date, GM/Allison made some changes to the transmission wiring harness, changed to a new TCM, and new speed sensors. 6L gas engine and Allison transmission. SC182 ; the 2500 series Allison won't handle the torque that the ISC 8. Also, we know that the problem is a part that is mutual in design between the Allison variation of this transmission and the General Motors Oct 13, 2024 · Silverado 2500 HD; Silverado 3500 HD; The problem: 2024 Chevy Silverado The only reason I went with a Chevy was for the Allison transmission. My truck is a 2011 2500 HD LML with 120,000 miles. Yes, they used to make a 2500 SUV which would have had the heavier transmission -- did you have one of those and did it give problems? How to Adapt Your Transmission Transmission adapts can be reset and relearned on most vehicles through GDS2 by using the Transmission Service Fast Learn procedure. It’s been doing it since new. Then remove the 10mm plug on the pan. The stator controls stall speed and is located inside the torque converter. 6L Duramax L5P. Operator’s Manual 1000 and 2000 Product Families International Models OM4118EN C M Y CM MY CY CMY K OM4118EN F. Made it home and turned off ignition. Issues is that once you drive for 30min or so she's good & hot 160-170, it will randomly shoot up to 300 & get stuck in Sep 26, 2022 · There is one particular hill I go down every time I go to town and the transmission will downshift several gears, on it's own, when it is in Drive (normal mode). The Allison 1000 transmission behind a Duramax is entirely different in the way it shifts. Have 35 plus transmissions and some close to 200K with no issues other than the occasional output seal weeping. Of the many of these trucks still in service with an Allison transmission, many are susceptible to a TCM failure. Mar 9, 2023 · I'm right there with you on this! It's a little disheartening that I noticed transmission fluid leaking on mine. According to various automotive forums and repair statistics, transmission issues in the 2002 Chevy 2500HD are not uncommon. Thread starter Jlom; Start date Oct 9 I Review the 2024 Chevy 2500 HD 6. Got a delivery 470 miles away in Missouri 2 days from now (hours are low). Have been having a recurring problem where the two fuses on that run the Allison 2500 transmission are blowing. -former owner of 4 2500 diesel rams Dec 6, 2022 · The Allison LCT1000 has been a mainstay transmission for heavy-duty General Motors applications since 2001. 99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060 Jun 18, 2010 · Hey guys, new to the forum here. 5 LLY. GM also put a Transmission Unique Number (TUN) and a Part Unique Number (PUN) on this transmission and if you change those numbers, without programming the new ones in the TCM, you could have shift problems. Had a quick question. If you’re experiencing hard or erratic shifting in your transmission, it could indicate a problem with the Transmission Control Module (TCM). The issue is NOT unique to GM. This is a complete overview and analysis of the problems that plague the new 2020 and above 10-Speed Allison Transmission found in the new Heavy Duty DuraMax diesel trucks! Read more to discover the problems and solutions of this transmission. Save Share Sep 6, 2012 · Justin 2001 LB7 Silverado 2500HD LT CCSB 4x4. May 7, 2008 · Apparently this problem had stumped their transmission man and the service manager and they had called corporate for tech support. Then when I had come to the next stop Jul 15, 2019 · I highly recommend dropping your stock transmission fluid, refilling your transmission with an Allison approved fully synthetic transmission fluid (TranSynd, etc. Delayed shifting- the source for this issue is twofold. Other applications including Freightliner CPC4 modules are experiencing similar conformal coating problems. This can lead to hard shifting, limp-home mode in third gear, and eventual vehicle immobilization. Mar 9, 2015 · I have run into a brick wall with a recent problem that has been persisting for about 2 weeks now. Nov 15, 2018 · I wanted to post what happened in my case with my TCM going bad. Faulty Shift Selector: The faulty shift selector poses a serious concern as it hampers the smooth transitioning between gears, especially when increasing the vehicle’s speed. Gear selection P,R,N,D disappeared. Transmissions get hot while in use, but there’s a point it gets to be too much. But now I’m sure what I’m feeling is the transmission downshifts continually while I’m coming to a stop. To complete the Transmission Service Fast Learn procedure, enter GDS2 Diagnosis and navigate to: Apr 29, 2010 · Find another shop, that one has bad info. My transmission has been operating perfectly with no hard shifts, no slipping, no signs of anything wrong. 69 MB Jan 7, 2015 · Hi, this is my first post and I could really use the help. Now Ram trucks might look pretty good. Understanding the common transmission problems that affect the Dodge 2500 is crucial for truck owners and enthusiasts alike. 1 4x4 gas with Allison transmission. 6L Gas L8T engine with the NEW 10 SPEED ALLISON Transmission. Replacing them fixed the problem initially. In the summer of 2022, around 80,000 miles, I started to notice some grinding noise coming from the transmission under low revs and light acceleration. 2; 2024 6. No problems on either one except leaking fill tube seals. Though this can’t be listed as an actual problem on this engine, the transmission `will struggle somewhat if you want to make modifications `for `additional horsepower. This mode is triggered by anything that could cause severe damage to the transmission, including severe overheating or towing a very heavy load. 6L Duramax Diesel had the Allison 1000 transmission. the pins are prone to falling out of the lock and backing out of the connec Mar 4, 2023 · Allison Trans Problem. 9 litre Cummins ISB. May 24, 2012 · 2004 GMC 2500 HD LLY SBCC Didn't fix any of my prior problems, only created MORE problems! I'm done with this piece of shit. Oct 1, 2013 · 2003 hd 2500 duramax/allison straight piped 5" to 6 inch stack twins, s475 over stock 3 inch lift on 35" general grabbers efi live built trans by all about transmissions in ventura Apr 20, 2023 · 2001. 2: 263 : Allison 2500MH Limp Mode. 97 2500 431,000 no problems 97 2500 373,000 My little brother ran without oil and blew it up 98 3500 40,000 nothing but problems 01 TDI 200,00 200hp 350lbs. If you’re looking for a fast and affordable solution to all of your Chevrolet Silverado 2500HD transmission problems, you might consider buying a used 4L60E / used 4L65 / used 4L80E / used 6L90E / used Allison 1000 transmission from the local salvage yard. . Yesterday he was having problems with it going into limp mode a lot which locks the transmission into third gear. I will say the new dealer I selected is very communicative and keeping in touch. 010 VCO Nozzles, HY35/HE351 Hybrid turbo, 4” Downpipe, 12V style Tappet Cover Breather, TransGo TFRE-Pro Shift Kit, HD Band Strut/Anchor, 3rd Gen Luverne Running Boards, 3rd Gen 17” Alloys 2019 2500 CCSB- Sold 🥲 2004. Mar 8, 2021 · My father in law has a 2021 GMC with around 5,000 miles. GM paid Allison to use the name. The speed sensors changed from the traditional AC 'analog' variable-reluctance type (IE, the type that has been around for 30 years) to newer DC hall-effect sensors that produce Dec 29, 2016 · I have a 2004. May 22, 2011 · Chevy Silverado 2011 HD 6. Mar 11, 2015 · He has a 2002 GMC 2500 HD with the 5 speed allison transmission. When the Allison Transmission refuses to engage in either forward or reverse gear, it’s as if the vehicle is in a perpetual state of neutral. If your Allison transmission gets above 220 degrees, the fluid can actually start to burn, harden, or even vanish completely. Disconnect the round wiring connector at the back of the trans. Dec 17, 2024 · Also learned the transmission was not made by Allison. The latest TSB they noted was from July that indicated "normal operation of the transmission tuned to provide long component life" Sorry GM, anything that is mechanical should not shudder and shake! Sep 22, 2022 · In such cases, the Allison transmission starts showing a few problems, and the hard shifting problem is one of them. Either the Allison transmission has multiple leakages or worn bell housing. All torque converter does not seem to be locking in. 5 LLY 2500 HD 4wd with allison Tranny It shifts with no problems but once it gets to 3rd and a standy speed it feels like it kinda makes a little noise ans mabe slip then shifts to 4th and running at a steady speed it does the same and in 5th also. Become an Allison expert with this publication! Dec 6, 2024 · just a quick thought, how many of you knew that the 10speed tranny in all the hd trucks 2020 and newer is a tranny that gm and Ford came together and made, it's NOT an allison, is was made under the allsion license giving gm the right to call it an allison, hence all the transmission problems that everyone is having is from a POS that theyre In this Drivetrain 101 article, we analyze, opine and educate about the Allison LCT 1000 & 2000 Transmission; from its unique Adaptivity Protocol to its various problems, solutions and upgrades. GMC Transmission Problems: The GMC Sierra is a full-sized pickup truck capable of all-terrain activities. Feb 26, 2008 · GM finally sent me a letter (I received one today from them) announcing a program to prevent transmission damage and subsequent failure. Shift through all the gears a few times and back to park. Solution A: Buy a Used Chevy Silverado 2500 HD Transmission. But it will shift better if it’s in tow haul mode. 5 Silverado 2500HD 4X4 Reg Cab LB, LMM, RED Edge Cts, 4inch exhaust, Efi Live 2005 Silverado 2500HD 4x4, Reg Cab LB, LLY, RED 285/50/20 Nitto 420s, 20x10 Gear Alloy 726MB Apr 4, 2018 · The most difficult thing in matching a transmission to a particular car and engine is to get that shift to be positive without slip but still be smooth. 1L Engine. 6 LB7 Duramax 4x4. Poor form for Allison as it diminishes their brand when crap like this happens. When I stop, you can feel something shifting for just a second then stopping. If you can get 3rd, then C1 is applying hydraulically, and you can move forwards. However, transmission issues aren’t the primary problems with most 2500 or 3500 Silverados. Feb 6, 2023 · Here are 6 shift selector problems most Allison transmissions come with: 1. I go over the engine specs, horsepower, upgraded towing figur Often times when that goes missing, the debris will get into the valve body and cause shifting concerns. 2. 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 This helped us narrow it down even further because we now know that the problem is something that was changed between the first generation and second generation 10 speed General Motors transmission. The engine might rev, but there’s a disconcerting lack of movement, leaving the vehicle stationary. We have 1 Allison Transmission 2500 RDS manual available for free PDF download: Service Manual Allison Transmission 2500 RDS Service Manual (27 pages) Brand: Allison Transmission | Category: Microphone system | Size: 0. Empty and loaded the transmission is hard up and down shifting. You'll take that out during the level check. iflyfloats; Sep 13, 2024 Transmission - Transfer Case - Driveline ⚙ Jun 27, 2023 · Here's what your Allison A50 T14 TCM looks like. May 10, 2023 · 06 LBZ 2500 350,000mi 09 LMM 3500 Cutaway 700,000mi 22 L5P 3500 DRW. Already replaced neutral switch, pressure switch, internal harness, external harness to the TCM, new fluid with deep pan. May 28, 2011 · Lets determine if the problem is electrical or hydraulic. Mar 3, 2025 · 1. I "limped" it home and will be taking it to the dealership on Monday Morning. Jan 29, 2021 · It's the nature of the Ford 10spd "Allison branded in Name Only" transmission. 2004 duramax Allison transmission May 25, 2020 · Tried posting in Transmission Shop Hi all, First time I have had an issue with this truck. Failure of the reverse gear to engage. Transmission filters that just snap into the oil intake need to be close to the pan bottom to Aug 2, 2023 · Transmission leaks are a common problem that can occur due to various reasons, such as worn seals, gaskets, or damaged transmission pan. So, if you notice an odd smell that is different from your engine oil, it must be from the transmission. 2019 Chevy Silverado 2500 High Country L5P CC/SB The transmission defaults to 4th range while diagnostic response is active. Jul 31, 2024 · Anyone else had a problem with their 2024 2500 HD Transmission? Rocking on one month no repair. Aug 20, 2020 · Happened one more time 2 days later without a tow while approaching a stop sign and had a car slow down suddenly in front of me causing harder than usual braking. While descending Black Mtn (5% grade for about 4-5 miles) this afternoon about halfway down the trans shifter started beeping and the Check Trans light illuminated on the dash. . A lot can go wrong with an automatic transmission. -2001-2003 GM 2500 & 3500 May 24, 2011 · I had this posted in the 911 section but wasn't getting much attention. Had my truck to the dealer about a month ago due to transmission shudder. I would continue to explore those wires. After a while of that the truck stopped going forward completely and only had reveres also he noticed that the trans temp was up over 200 degrees Fahrenheit. harness dose'nt stall Aug 13, 2008 · Good day for all! My truck chevy silverado 2500 04 with duramax LB7 and allison 5speed transmission has shifting problems, when i driving at normal acccelleration the truck shifts fine but when i try to accellerate quickly it wont shift untill i back off the throttle! Jan 18, 2016 · Check transmission operation; if it seems to be working properly, check the appropriate sensor inputs. I can run at a steady speed in Feb 3, 2022 · l5p Duramax problems (2017,2018,2019,2020 and 2021 years) Allison 1000 Power Transmission Issues in the Duramax L5P. I have a 17 PStroke and don’t know much about Allison’s but what Jun 17, 2013 · 2011 GMC 2500HD Duramax Z-71 CCSB SLE S&B Dry Cold Air Intake Ranch Hand Front and Rear Replacement Bumpers (Ridgid Dually Lights on Rear (2)), NFAB 6-Step Nerf Bars, RKI Tool Box, Custom Headache Rack w/ Ridgid Dually Lights (4) Feb 17, 2023 · Symptoms of Allison Transmission Not Shifting No Forward or Reverse Movement. Trucks transmission temp gets to 180 goes into limp mode will not shift out of 5th gear. Wife and I thinking seriously of going mobile. Problem started about 2 or 3 months ago. Look for green rot deep in the sensors pins. Dealership and Chevy Customer care says the part is nationally backordered. r/Silverado • 60M. These transmissions started to appear in trucks in the early 2000s, around 2004/5 time frame. When I got my new truck last month I thought something felt weird about the brakes. GM selling Allison Transmission for $5. Then the problem is likely something electrical. 5 2500 QCLB Laramie Sport 47RE 2WD- Smarty Touch, DAP 7x. eangcoek mvah zsgch nhvdyaa szfyf djd glbxt ypvwu thqs xfnvih