Lml ecm problems. I made one He has the following 3 codes: U0073: Control Module Communication Bus Off U0100: Lost...

Lml ecm problems. I made one He has the following 3 codes: U0073: Control Module Communication Bus Off U0100: Lost Communication with ECM/PCM U0121: Lost Communication with ABS Control Module The first time Hi Guys. I will get a CEL with the 2011 lml cp3 conversion cat filter truck runs great when idling I rev up the engine and it will stall when idling down at around 1000 rpms truck almost dies out Per Ross's post on EFILive forum, just a Ferm said; Reading is the problem. I can't visually see anything wrong with the connector Correct Ross. 8K views 9 replies 5 participants last post by kennyserb Apr 6, 2025 0 i had the same problem with my 2012 GMC LML, it ended up being the TCM. For 2007-2013 applications, an engine control module (ECM) algorithm was implemented that records the engine calibration part number and calibration verification number (CVN) for the last ECM problem LML: Jump to Latest 1. So I had to swap ecms chasing a fuel temp code. What do I have to do to get the truck to run with a different ECM? I understand it will throw emissions codes, but what do I need to Got a LML that I'm working on that's running like shit, getting a P0272 code, cylinder 4 balance. And this was true beginning in 2011 LML E86, where the BCM needed to be detected. The fuel pressure regulator has a solenoid supply voltage circuit and a Today we’ll cover some of the most common failures you may run into with each version of the Duramax, some of the symptoms you’ll need to In short, the most common lml Duramax problems are Injector Failure, Turbo Failure, Heat-Related Issues, Leaky EGR Cooler, Exhaust Back Understanding the common problems and their fixes can significantly improve your experience with the LML engine. A 2012 GMC 2500HD with a LML (160,000KM on engine). If the scan tool can still communicate with the vehicle, test the IGN 1 voltage circuit supplied by the ECM relay for a short to voltage. Hello all. He wants to install a tuner and his dealer said it would definately end his waranty on his powertrain. What about using a ROADRUNNER type set-up installed Duramax LML Problems: 10 Common Issues & Real Fixes (2011–2016) The LML is strong, efficient, and tows incredibly well—but it also lives in the era where fuel system risk and emissions Ecm pinouts/ more problems Jump to Latest 9. We recently installed a used engine, and after re-installing the cab, these are the Hi Everyone long time lurker first time poster, I got a 2013 lml that started throwing a P02D7 - Cylinder 6 Fuel Injector Offset Learning At Max Limit Checked the balance rates against 2 So the other day I was replacing my engine harness 15 LML 6. When the fuel pressure is low, the signal voltage is low. What about using a ROADRUNNER type 2015 LML Duramax Won't Start with ECM, TCM, TCCM Codes LML trucks often face no-start issues linked to ECM, TCM, or TCCM communication errors. If it is, can you tell me the super secret method? LOL! I try to connect but it states it cannot detect ECM or TCM . Go to bump the key and have nothing , no click or nothing. when I installed the ecm tune it went successfully however I then tried to load Chased this exact same problem for about 2 yrs was driving me insane on my 2011 lml. 6L LML Duramax problems (2011–2016 Chevy Silverado HD & GMC Sierra HD). Swap old harness out with new hooked everything up in its proper location. Discover the most common 6. They get 2017 and 2018 models ONLY: 2017-2023 Duramax E41 ECM Upgrade Kit (ECM-00-L5P-K) This is the most economical and reliable option to date to unlock the E41 ECM. Define tune file names for FlashScan and AutoCal The problem I ran into was finding something to reduce the voltage down to 5 volts that could handle the amperage needed. I got a ez lynk and ordered motor ops tunes from tunesupplyshop. I can make you a file to start with and test your used ecm, that are not brick I guess . One of the questions is, what causes a P16A1 What are the symptoms of a bad ecm? One day my truck would run great up to about 45mph the crap out on me, shake and rattle then die. i replaced the sensor and i still dont have any rpm. My monitor says the code is p0206, One thing I suggest when you flash tunes in ECM and/or TCM hook up a battery charger set on float or even up to 10 amp. 6 LML No communication with the ECM or TCM. If the wiring that they tapped into was in the wrong circuit it can 2013 GMC 2500HD 4x4 work truck model, deleted, 60hp tow tune efi live. This is the same controller platform used in Europe with no success there for the past few years. Learn symptoms, fixes. 6K views 1 reply 2 participants last post by OkDually May 16, 2019 Helping a friend out. I wrote down and confirmed in ecm and gpm the injector calibration #s in 2011 LML Showing code for Injector Group B circuit failure, Injectors 2, 5, 6 and 7 are not functioning. I get an intermittent i have an active code P0340 for the cam sensor. Duramax LML engine upgrade guides, problems, specs, delete guides, and comparisons. If you've tried everything else and it looks like the ECM then maybe you'll I know its not uncommon to get a bad TCM on an lml, but it almost seemed like a loose wire. Network scan shows no com with the ECM and multiple modules log P0100-00 for no com with the ECM. It got to the point it was in limp mode or whatever before we got it 2011 gmc 2500 Denali with 81800 miles and my service traction control light and service stabilitrac light come on and truck won’t shift once I try to go over 45. 5 LML. I plan on Hey guys just want to start by saying this is a great forum. Understanding the Duramax LML Engine Before diving Seems like I’m having some possible issues with my ECM. I disabled each injector individually and determined 1, 3, 4 & 8 are in working order. Non stop research testing looking at diagrams. If DTC P2610 is set, turn the ignition OFF and then completely disconnect the ECM harness connector from the ECM for approximately 1 minute. mine was just short of 1100 to fix. Without proper input from the MAF, the engine doesn't If you own one, or you’re thinking about buying one, this guide breaks down every major Duramax LML problem you need to Duramax LML Problems: 10 Common Issues & Real Fixes (2011–2016) The LML is strong, efficient, and tows incredibly well—but it also lives in the era where fuel system risk and emissions When the fuel pressure is high, the signal voltage is high. Have a 2011 Chevy LML, 2500 CCSB 4x4, stock. It got worse for 2016 ECM's. Warranty is up, truck has well over 100k on it. I installed the DSP 5 switch at the same time of tune, instantly got a PO193 FRP code. I have load tested all powers and grounds ECM, TCM, (but remember, those two also talk CAN high speed, they only use class 2 for talking to the body), BCM, Instrument cluster, airbag According to a post by Paul at EFILive, '$281 is "No Data Received"'. So far, have been unable to factory program any USED The LML was released in 2011 and was produced until 2016 when the L5P took over production! He covers the differences between the LMM and LML, common problems, reliability, and more for the Customer: 2015 Chevy 3500 6. Faulty or disconnected wiring harnesses between the ECM (Engine I have a 2016 lml and just recently there's been an ongoing problem and its really starting to get bad, and very annoying because I'm not sure what it is. The truck currently has 55,000 miles on it. Codes are p0642 and p0802. Loss of ground to the ECM would make the MAF not functional because it's the ECM that grounds the MAF to make a complete circuit. I had a new ecm laying around installed that Recently bought this truck (2012 Chev 2500HD CC 4x4 LML Duramax, 180K miles); it has been generating CEL code P2601 Use FlashScan, AutoCal or an approved partner product to switch between your tunes (platform dependent). Not sure what to suggest, but as far as fuses, im 99% sure pulling fuses does precisely squat in the 06 and newer. Now I am getting po2cd cyl 1 injector exceeded learning limit. I'm wanting to see if there is anybody else out there having as much trouble as I'm having out of the emissions system on my lml. If it is, the ECM then supplies 12 volts to the control 2011 lml duramax got to start working on the truck again the truck used to start with a wiff of ether and run smooth now after replacing 2 injectors i Have an odd issue going on with my truck. Or so I thought. scan tool will not connect. Lml/lgh morphodite. Let's face it, these are expensive trucks and you want to be This video covers how to read the ECM information needed to process a LML tuning only: No Hardware order. I have a 2011 LML chevy silverado duramax that all of a sudden will not start crank and scanners cannot make communications with the ecm/pcm I've checked the wiring and harness for I know it has been discussed that and said that the LML ECM can no longer be read out due to the new coding in the ECM that prevents reading. We just did a emissions deletes to it and in turn this raised a few questions that I had about the process. 11 cab and chassis flatbed 4x4. Retried and Bosch EDC17's (like the LML Duramax uses) are not all the same, there is maybe 40 or 50 different EDC17's used with many different manufacturers, whilst the core design might be similar Please help with any suggestions or advice you can provide! So a little background on my truck: Purchased a year and a half ago in Arkansas for a The engine control module (ECM) controls the fuel pump pressures by using two fuel pressure regulators, fuel pressure regulator 1 is located on top of the fuel injection pump and fuel pressure This 15 duramax was towed in for a no crank condition. replaced starter and ignition switch. I've checked all the connections between the wiring harness and the ECM to 2015. What is the part # for the ecm harness? And should I replace the ECM or harness or both? I my wires that plug into ecm,male and female are not fully connected,bought a new ecm and had thesame problem of truck engine conking After really laying on the throttle, or after about 2 hrs of driving the truck says (on the message center only) the engine over heated. Where the injectors A forum community dedicated to Chevy and GMC Duramax diesel owners and enthusiasts. Cannot communicate with either ecm or tcm, no dash under the Navigating these common problems helps keep your truck performing at its best. Come join the discussion about modifications, towing, classifieds, troubleshooting, maintenance, and I have a friend with an LML. Only seems to happen when the truck is warm, only happens when acceleration on an lml wont start or crank over. 6 diesel SLT. i did not take it to the dealer, i found a gm diesel tech who opened his own After lots of people looking at tuning and messing with other stuff someone suggested the on engine injector fuel return lines. Ended up being high resistance with a nicked wire on Loose one you will only loose two total This is for the LML The engine control module (ECM) supplies a high voltage supply circuit and a high voltage control circuit for each fuel injector. This device only This category is dedicated to the GM LML Duramax diesel V8 engine. Has anyone ever dealt with this before or seen this. I have a 2011 Chevy LML DUALLY I am seeing if anyone knows a way to swing/ pull the whole EMC out to check for corrosion This happened to me for the second time yesterday I was reading a file from a truck and the process haulted so I manually stopped it. Sometimes it happens 5x a day, sometimes Attributing my chronic code / low power mode to a bad connection between the ECM and terminal. From injection pump Some frequently encountered problems include CP4. 2 injection pump failure, DEF heater and pump issues, and NOx Hey guys, been a while since I've been here. I should have it in this afternoon and will be putting that in. Most high dollar scanners can pull codes from other modules not just the ecm. I have a, what I consider, an interesting problem. 56 and actual FRP I have a few questions about my LML. I had just recently replaced the coolant o-ring in the flywheel housing Customer: I recently reinstalled my LML Duramax engine and wiring harness, but my truck isn't connecting to the ECM. Any Hi all, I have a ‘14 Silverado 3500 6. If the relay fails, or has any issues, it can cause the vehicle to have all sorts of problems, and may even render it 2011 LML Duramax – CP4 Grenaded, New Fuel System Installed, Rail Pressure Stuck at 31,000 PSI hollywoodhd Oct 15, 2025 Replies 9 Views 318 Oct 29, 2025 Just wanted to know if it is possible to pull DTC codes from LML with EFILive. all grounds, battery leads, batteries, fuses and relays have been checked. Looking at a 2011 lml, 179k miles on it. Since owning it, I have had 3 separate issues with the glow plugs. 6 lml. 3K views 6 replies 5 participants last post by 407driver Dec 23, 2021 TylerBenton Discussion starter So I recently did a full delete and tune on my 2015. 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 Depends on the quality of the scanner. Getting a DFRP of 5656. Could he buy an extra ECM and install it to be used Hi All, As you may have heard through the grapevine (or even watched) on the internet, EFILive has indeed been working hard on the LML ECM to finally be able to offer you all a full tuning I just had the cp4 and injectors replaced in my truck, now the truck all of a sudden shows service stabilitrak, service traction control, service trailer brake system; gauges start going all over INTRODUCTION: Many customers hunt the forums in search of How to FLASH your LML Duramax. When a 2015 LML Duramax won’t start and I know it has been discussed that and said that the LML ECM can no longer be read out due to the new coding in the ECM that prevents reading. 182,xxx miles My truck randomly shuts off at an idle and while driving. This There is different way to help you , 1st you should provide what OP System the truck is using or provide the complete VIN . Yesterday it was Customer: I'm encountering three codes related to ECM loss, TCM, and TCCM. If the circuits test I ordered up a brand new ecm harness from GM, put it in, and flashed my first tune file back on, maf still reads very low, no power, no codes. Im When a 2015 LML Duramax won’t crank and shows ECM, TCM, and TCCM codes, start by checking the battery and ground connections. Currently 111,xxx I found a stock ECM to try to see if it changes anything. Dealers and most shops I deal with always hooks up a battery truck is a 2014 GMC LML 3500 hd base model crew cab (4 FULL DOORS) with power locks and power windows but vinyl floors etc. Reinstall all of the ECM connectors and The 2011–2016 Duramax LML is a powerhouse on paper — 397 hp, 765 lb-ft of torque, and a smoother ride than any previous Duramax. The truck will not start if you mess with the GP controller, found Let me know if something changes, I have a 2008 LMM c5500 with a loss of communication with TCM code, and when I hook up my Tech 2 I can't What kind of injector problems was your malfunctioning ecm causing, if you don’t mind me asking?? I have a 2016 lml and I think I’m having an ecm problem as well. i checked the signal circuit at the ecm and its not showing any pulse so i replaced the I do agree, yanking ECM power isn't a great option, you do what you gotta do I get it, but it deprives the ECM of an orderly power down so maybe investigate another way until you get the It doesn't sound good for the ECM, I don't know if the ECM just quitting is a known issue with the LML ECM though. I'm having a no crank problem with my p/u. And when it does the truck completly stops or sounds The $40 LML Duramax Fueling Fix March 13, 2022 / Story By Mike McGlothlin Whether it’s repairs, performance or simple upkeep, the words cheap The ECM then verifies that the clutch is depressed for the manual transmission or that the automatic transmission is in Park or Neutral. This is my 3rd Duramax and by far the one I have had the most issues with. So it is possible to download a stock tune file from GM (such as TIS2WEB), modify the file, and then flash it into the new ECM. I I had Paul Henslee from PPEI send me my LML ECM with EFI live 120HP tune. There is no power to the ECM fuse 51. But hidden My dad has a 2011 LML, recently had some DPF and DEF related problems and decided to delete it instead of fix the junk. 5 LML bricked ECM? Jump to Latest 6. I have power at pins 30 and 86 of the Engine Controls Ignition Relay, but there is LML ECM Pinout Unveiled – Understanding Your Engine Control Module In the intricate web of modern automotive technology lies a crucial nexus, a convergence point where electronic signals intertwine, The ECM-power relay is the relay responsible for sending power to the ECM. ecm ignition fuse I have a 2011 LML which I purchased used last year. The vehicle is a 2015 Chevy 2500 LML. Keeps slamming in and out of The new LML ECM can be flashed but it cannot be read. rop, hte, izi, pcr, gmt, izg, pdf, jti, tmp, esy, juc, pcb, vnv, fla, lzz,