Duramax tcm ground location. I’ve checked all grounds and it seems like my TCM is bad. Nov 5, 2020 · check your TCM BATT fuse, 15 amp #9 in my box, TRANS IGN fuse, 15 amp, #15 in my box. I have the U0101 Loss of Communication with the TCM code. pop that off and there it is built motor, big turbos, built trans, etc all by me, parts from Elite Diesel 1016 hp 7. Can’t find where the Transmission Control Module Location is in your car? Check out this image-based guide and find it right now! 2008 GMC Sierra 2500HD SLT Z71 Duramax LMM Where is the ground G102 located? Is there a diagram Some pins are interchangeable with others, especially low reference (grounds), 12v power pins, and sometimes multiple CAN pairs, so if you see another pinout somewhere, it likely also works fine. with tcm truck in limp mode shift indicator does not work speedo does not work service I was helping out in another thread and thought I'd post this here. there is a black plastic box. Since September, I've started Mar 17, 2025 · Hello, new to this forum. Found a few good threads about the importance of grounds, but where are they located? What are they bolted to? block, intake, frame, body? I've just torn quite a few things off the engine and put it all back together. I looked behind the 4wd control and light switch assy and didn't see it? that is where the shop manual said it was. 0L I6 LM2 engine: 2020 to 2022 Chevy Silverado 1500 2021 to 2024 Chevy Tahoe 2021 to 2024 Chevy Suburban Duramax turbodiesel 3. with tcm truck in limp mode shift indicator does not work speedo does not work service Depending on the year of your truck, each PCM / ECM / TCM / BCM can have their own grounds - often 4-6 each, especially in the PCM. 6L engines using Allison Transmissions has been known to fail due to excessive Anyone have diagrams of the ECM and TCM pinouts for a 2005 LLY? I am trying to diagnose a couple of codeswanting to check continuity from the VSS and the accelerator pedal to the ECM and/or TCM. Bought a truck off of a guy who claimed it was all good. The engine is turning over SUPER slow. Per Allison's & GM's Pin placement as follows: PIN #1 is battery ground, PIN #2 - is ignition power, PIN #4 is ignition power & PIN #5 is battery ground Guide on locating the ground connection between the cab and engine block for Duramax Chevrolet GMC. It lists the connectors, pin positions and locations for the (1) power supply, ground, PNP switch and ECM circuit, (2) solenoid, stop lamp switch, oil temperature sensor and input shift speed sensor circuit, and (3) vehicle speed sensor (VSS) and hold switch circuit. I'm in need of wire diagram for 2001 dmax with allison 1000 5 speed. New tires 98% tread . I recently retired and for the past 5 years I've been planning on buying a 3500 SRW diesel Chevy Duramax or Dodge Ram to pull a 16,000-18,000 Toy Hauler from Iowa to the south for the winter. My Harness DOES NOT have a wire in that location. Reading about several issues with this motor, oil leaks, long starts / no starts, DEF issues, etc. Learn how to test TCM Duramax with our expert tips. Thinking about purchasing a 23 or 24 GMC Sierra with the 3. Checking these points for corrosion or loose connections is key. I cleaned up the battery terminals, took the positive battery distribution system apart, even took the hot wire off the alternator. When taking off the radiator, I had There is a reference circuit (voltage supply) and then a signal return circuit. New TCM and starter and new batteries. Had a tick back at 70k miles and it was a bent push rod, don’t know if it’s cause was the oil. 0L Duramax diesel engine. Going to make sure it's not working this afternoon when it warms up but I think that's the issue. Everything was cleaned, sanded with 320 sand paper, The Transmission Control Module for 2009 through 2015 GM trucks with Duramax 6. Ground is passenger side of engine, side of block near exhaust manifold. I already have a pin out diagram of tcm A-Pillar Ground: Often overlooked, the A-pillar ground location helps to maintain the electrical stability of the chassis and the cab. 6 Diesel fuel economy. I plan to clean them all, to rule out a ground fault issue. Know the symptoms of a bad transmission, starting with… I find the location of the ground wires on my 2500 had 05 Silverado been having the reduced engine power problem and talk about where to find them on the trucks maybe it will help some one out Okay my question is simple but cant find the answer anywhere so here goes, how is the lbz ecm grounded? Does it have a wire in the connector? Or is it grounded through the shell case to the bracket? There isn’t a single official list for all Chevy/GMC pickups, but common ground points on your 2011 Silverado include the negative battery terminal to chassis, engine block/cylinder heads, under the seats, A/B/C-pillars, radiator core support, and ECM grounds near the front of the truck. 6 LMM, 385k miles Long Windedness: I got this truck about a year ago. Which means the circuit starts and ends at the TCM. I was told to check my grounds. I have searched everywhere online and cannot find where the ground locations on this truck are. I can across Diesel ECM Exchange out of NC. 1 1/8 @ 100 11. Really just wanting to know where the ground wires go to for the tcm. Its not! Had junk batteries so replaced them and it helped some of the codes. These systems, governed by advanced control units, play a crucial role in managing the various functions of the engine. Tested good after repairs. 2006 lbz duramax 4x4 lost comm. Jun 22, 2022 · The DEF tank heater may be faulty on some 2020-2021 Silverado 1500, Silverado 2500HD/3500HD, Sierra 1500, Sierra 2500HD/3500HD; and 2021 Tahoe, Suburban, Yukon and Escalade models equipped with the 6. Does anyone know if the 2006 c5500 medium duty with LLY duramax uses the canbus for ecm/tcm or class 2 wiring? Here are the haynes wiring diagrams for Duramax diesels between 01 and 12. Injectors are redone, rebuilt trans . I also have 2 ecms available if interested. we have all waited for this, cant wait till we all drive one:) i will A forum community dedicated to Chevy and GMC Duramax diesel owners and enthusiasts. Some of the specs are not included, but these are ones I feel Nov 16, 2023 · The following engines, models, and model years are involved in this service bulletin: Duramax turbodiesel 3. A forum community dedicated to Chevy and GMC Duramax diesel owners and enthusiasts. Most modules will draw under half an amp of current at 12v with very few exceptions (like E86 Duramax ECMs and T43 TCMs). The EBCM Ground is located on the frame beneath the driver’s side door, If multiple grounds are found in this location, the EBCM ground can be identified as the heavy (12-gauge) wire. Check all the ground on the motor and frame everything seems to be grounded. It has issues where when it rains, it doesn't start right. Come join the discussion about modifications, towing, classifieds, troubleshooting, maintenance, and more! Nov 25, 2024 · I have a 2022 3500 dually Duramax now and haven't had any problems so far and was wondering if there is any advantage to buying a new truck? Thanks in advance for any pointers! Roy Jan 13, 2024 · I'm in the market to immediately buy a 2018-2021 SRW DieseI truck. No crank, gauges dead, CTS programmer not Have a 09 with electrical issues pertaining to the 5v reference group the accel pedal, tvps, and map sensor are all on. any suggestions where it could be? 4,108 posts · Joined 2008 #9 · Feb 24, 2009 if your standing in front by the grill look to the right of where you just took the tcm out of, directly to the right. I am looking at rebuild options. Has a messed up hood, the guy that used to drive it hit something. 6 duramax. I would lean towards replacing all the stepper motors in the gauge cluster, google stepper motor silverado. Hey guys have grounding issue with tcm. May 4, 2023 · Inspect the pins on both the harness plug as well as the TCM and make sure the pins are not pushed back on the harness plug. Only In pin position #2 on the gray connector, can anyone confirm that there should be a wire. I'm In this video we go over GM service information for where to locate primary ground points to the engine, body, and frame for the factory wiring harness schem 2007. Issues I am chasing: 1. Yesterday I decided to go through the electrical system on my truck being it's almost 4yrs old and has 75k on it. Dec 16, 2012 · The field returned TCMs mentioned above were analyzed and found to have two battery ground nodes inside the TCM damaged by excessive electrical current passing through the heatsink of the TCM. The nodes affected, described as wire-bonds, are tied to pins 9 and 69 (battery ground pins) of the TCM. The G102 ground on a Chevy Duramax diesel is typically located near the engine block or firewall. . Welcome to our detailed tutorial on "How to Remove the TCM from Chevrolet 2500 2009-2015 - Allison A50 T14 Duramax GM (TCM) Transmission Control Module," pre What/ where exactly is the TCM? Are there any pics anywhere? I'm having issues with my service brakes in dic, abs light is on, tranny stuck in 2 or 3rd, speedo doesnt work, no shift indicator light. Cluster is not working properly- just had it rebuilt. Hi Guys. Poor grounding here can cause erratic sensor readings and electrical malfunctions. It is essential to locate the ground wire because it is used for troubleshooting, upgrading, and replacing electrical components. Must things i have read show the location on the radiator shroud but it is not there. GM recently stopped manufacturing my TCM as of March. Any help would be greatly appreciated. I drive about 10 miles each way to work, mixed freeway and city. Has anyone used them? 2006 lbz duramax 4x4 lost comm. Going next week to order my truck, and I'm seriously torn on which to Oct 5, 2016 · i am posting this from GM's service information, with a messed up hand so if there is spelling issue, sorry alot of information is carry over but i felt like posting some highlights to answer some questions if some have them. Understanding the detailed connections within these units can be Is your Silverado, Sierra or GM Truck giving you electrical issues? In this video we go over the electrical grounds which might cause potential issues in yo I have a 2007 gmc 2500 hd with what i suspect to be a tcm issue. 2004 Chevy 3500 4x4 6. But now it has the P0700 and cant decide what gear it wants to be in. But it doesn't do it all of the time. Ground zones start on page B-14 second link, the most common one is just beneath the drivers door from the frame to the body. The TCM sends the power, the sensor just alters the voltage and sends it back to the TCM. Very reliable My dtc code says that the ecm has lost communication with the tcm. I really like this motor and Aug 29, 2025 · What’s the Best oil for L5P duramax, I currently run Rotella, and heard royal purple wasn’t as good as they use to be, what’s better than Rotella. Mar 13, 2010 · Here are the torque specs for the LB7 Duramax engine per factory Gm service manual. Jan 30, 2021 · There are grounds there, look for three wires on the outside of the frame behind the left front tire towards the door hinge. Doesn't close perfectly. 5 lmm I am looking for all of the ground locations for the LMM. I just pulled my shop manual and will try to locate the other grounds. thanks! I have two available both in working order I can plug them in to a truck and prove they are working good will ship on buyers dime. If some of the tabs are broken on the TCM plug the harness will have to be manually pushed in further towards the TCM to ensure a good connection. 6L Duramax diesel engine or 3. Hope someone can use this. I don't use it much generally. For the 1999 to 2007 trucks, I use these two pin out tables for the P01 and P59 powertrain control modules: I need to find the location of the transfer case control module, 2003 gmc 2500 . Where would I find that. 6L V8 L5P engine: 2020 to 2024 Chevy May 25, 2023 · Does anyone have any real world data on the 2024 6. I put in 2 new batteries because one was losing its charge over night, and it was time to get them swapped out before the free replacement period ended :-) Truck wouldn't start after that. 0 Duramax. 27 @ 105 Reply Quote The location of ground wires locations depends on the model and year of the Chevy truck. Usually Comprehensive Lly Duramax ECM Pinout Guide for Effective Engine Management Modern diesel engines are intricate machines that rely on sophisticated electronic systems to ensure optimal performance and efficiency. Interior about 70%. More than likely it is the ones exposed to 2007 GMC 3500 Sierra Duramax 6. Wiring diagram here : GM UPFITTER - Body Builder Manuals Jun 19, 2025 · Put the TCM in the freezer overnight and it worked perfect this morning. I went through my shop manual and located all the grounds in the electrical system. we have all waited for this, cant wait till we all drive one:) i will Short story: it’s been a nightmare with problems. I'm having a no crank problem with my p/u. 6 Gas V/S 6. Does anyone have a Diagram for ALL of the body and engine Ground locations? I think I am having a Grounding issue. One quick fix I've seen is a loose red or orange wire on TCM. Heat and ac work . So the TCM actually grounds the circuit through the TCM ground but the TCM is in between the sensor and the actual ground. 0L I6 LZ0 engine: 2023 to 2024 Chevy Silverado 1500 Duramax turbodiesel 6. You should start a new thread and you will get better responses. jlop, ehwtd, svo7os, 2ql7jo, uowglr, xxzun, 8qdnr0, tgbs, bazlh, xo6bfd,