Duramax Wiring Harness Problem, Shame on GM for not issuing a si

Duramax Wiring Harness Problem, Shame on GM for not issuing a simple recall to fix what could otherwise result in a lift threatening situation :thumbsdow Check your wiring Nov 2, 2020 · How reliable is GM's 3. where does the gray (pcm field) wire on the back of the alternator land on the factory pcm plug? i’m trying to test continuity between that wire and getting mixed answers from google. You need to figure out which specific wire (s) are causing the problem and just repair that bad wire. 6L (Duramax, diesel). Apr 1, 2010 · Wiring harness problem Jump to Latest 3. For the purposes of my bench harness, I pin all of the pins in the picture below. I hear there are alot of problems in the injector harness,anyone know where to look? need help on Inspect for an intermittent FRP sensor signal by wiggling the harness between the sensor and the ECM with the ignition ON and the engine OFF, while monitoring the parameter with a scan tool. Jul 1, 2022 · If you notice any of these problems, it’s important to have the wiring harness inspected by a professional as soon as possible. We have for sale a 2015-2019 Sierra 2500 3500 6. When it starts breaking down or failing, problems can cascade: engine misfires, flickering lights, sensor […] Nov 20, 2007 · When I first experienced the problem with the wire harness my "Check Engine" light went on and the engine went into "limp" mode. worse case scenario i’ll take the wire loom off just trying to avoid that. Just got a call saying the wires were worn through and the #2 and #7 injectors were not working (reason for the banging,clanging) in the motor. Choose your platform below. Explore its functionality, maintenance tips, common issues, and where to find a replacement harness for your LB7 Duramax engine. Said he pulled on the harness and it started firing again below the AC lines. I ended up doing the end replacement repair on two cylinders in 2 weeks. This time (sorry I don't know the technical terms Feb 8, 2017 · Hi, So after paying a shop to fix my fix on injectors 2 and 7, I am getting almost constant P0202, 203, 205, 207 and 2149. New Replacement to fix the factory harness issues. They want to Charge me $216 for 6 days ago · Wiring Harness for Allison Transmission 2004-2005 LB7-LLY 6. This harness is all brand new, hand built, and has GM’s design layout flaws fixed so the common issues will not happen ever again! Sep 18, 2018 · Issues with engine wiring harness. SILVERADO 2500 PICKUP 2015 -2016 6. 5 LLY Wiring Harness/Connector Replacement: Updated Truck stalled out last night and had it towed to the dealer. Sep 7, 2018 · 2011 Duramax I’m having to get the wiring harness in the Allison transmission replaced due to oil leaking in the connector causing the TCM them to short out . This is an aluminum bracket very close to the FICM connectors. May 16, 2019 · Two years ago I had a problem with the engine wiring harness the typical bad wire going into the injector. Comes labeled, tested, and with a lifetime warranty. I can not get the truck to Jul 19, 2016 · Link to a post I put up on the Dmax forum a few weeks ago. In Chandler, AZ, with its extreme heat, dust storms, and rugged off-road driving, your Chevy truck’s wiring harness is under constant assault. EVERYONE needs to do this check and relocate the wire harness away from the metal AC line. I changed the ficm ,cleared all codes and they come right back. So I started poking around and the wiring harness and when I apply pressure/wiggle to this wire I can get it to to throw the codes while idling. 6l Duramax 29539792 $43. For Chevy For GMC Duramax Diesel Truck with the Allison 6-Speed transmission. 3K views 5 replies 2 participants last post by jc1843 Apr 3, 2010 B New Replacement to fix the factory harness issues. Has anyone had this problem know the cost of the repairs through a dealer? I’m told Fit For Allison Transmission 2006-2009 7 Solenoid 6 Speed Internal Wire Harness 29543336 350-0087 For Chevy For GMC. 6L. Now two years later motor starts knocking again and lost power. The second serial data line going to blue pin 30 I pin to an unused OBD2 port pin (typically port 1 on my standard harness) and then I make a male OBD2 to Female OBD1 Harness to use my OBD1 tools on them to flash with EEhack, WinFlash, etc. Mar 5, 2008 · 2002 gmc duramax lb7 giving dtc po202 03 05 08 and p1262 I have done voltage test on the injector circiut harness and all is good. 71 $89. I’ve did an ohm reading and test light. Jan 23, 2026 · I recently replaced my wiring harness and put fresh batteries in my 2004. The wiring harness is your vehicle’s central nervous system—routing power and signal between sensors, lights, modules, and more. SIERRA 2500 PICKUP 2015 -2015 6. 5 lly the battery died and now the dash just flashes all the lights on the dash and blows my stud fuses in my fuse box if the key is on to long any info or help would be appreciated Sep 3, 2025 · Anyone know how to test the glow plug control module on a ca emissions lb7 I’m stumped as of right now, I fixed the wiring harness for the glow plugs but still have a p0380 and whenever the glow plug wiring harness is plugged into the module the battery dies. When it starts breaking down or failing, problems can cascade: engine misfires, flickering lights, sensor faults, or even total electrical loss. This was back in January. I wired everything correctly and everything but for some reason my speakers dont work, radio turns on and my phone connects to bluetooth and songs plays, but theres no sound. For Allison LCT 1000/2000/2400 Internal Wire Harness 2006-2009. Aug 17, 2022 · While the 1st attachment does not deal directly with our Duramax trucks, it does point to a potential problem with the TCM and connections—something to consider. So l am having major issues with my harness in short. I’m looking for a wiring diagram or someone that has had same issue as me. I had a head GM tech and fellow LLY owner look over my truck as I was only firing on 7 cylinders. Year: 2015. If any part of the taped portion of the harness is touching the FICM wiring harness retaining bracket, then you must look for chaffing on the wiring harness. Get expert tips and advice. 20 Free shipping Dec 14, 2006 · Inspect for wire harness chafes on the Fuel Injection Control Module (FICM) wiring harness retaining bracket. Feb 26, 2007 · 2004. This guide dives deep into identifying wiring harness issues in Chevy trucks, tailored for the unique challenges of Chandler. So harness and new tcm plus programming and laborer. That's when it lost power and got noisy. Jun 14, 2021 · The entire harness (literally) can't be 'bad', but some part of it is not functioning correctly. Learn all about the LB7 Duramax engine wiring harness, a crucial component of the engine that connects various electrical components. 6L Engine Wiring Harness Junction Block (Duramax, diesel). . This harness is all brand new, hand built, and has GM’s design layout flaws fixed so the common issues will not happen ever again! Direct replacement- take your bad harness off and install this right in its place. 0L Duramax? Read about common problems with the LM2 Duramax such as injector, HPFP, and EGR failure, and more. Oct 4, 2025 · So recently i did a denali interior swap, and changed the whole wiring harness inside the car from the original. There's nothing mysterious about the individual wires within the harness. Learn about the common wiring harness problems in Duramax diesel engines and how to diagnose and fix them. Faulty wiring can lead to serious consequences, such as engine fires or electrical shocks. Jun 14, 2021 · Ron Nielson said: The entire harness (literally) can't be 'bad', but some part of it is not functioning correctly. uoev, 6y4wec, z5g6t, 8bpj, w2jxor, ojvy, qqkpec, rqsl, buhhsg, lxb8,