Duramax Bad Tcm Symptoms. Finally gave in and got a TCM from Ryan's Diesel Service, ins

Finally gave in and got a TCM from Ryan's Diesel Service, installed that, everything works perfect now. I couldn't find any threads to point me in the right direction, so between myself trying to research everything Jul 3, 2023 · The higher line pressure should make it so the clutches don’t slip, I wonder if they did some tcm tuning that has adversely affected the transmission. Scan tool that Reads Transmission ABS Sensor Codes: https://amzn. Top5autorepairs Subscribe In GM vehicles like Chevy Silverado, GMC Sierra, Acadia, or SSR, a faulty TCM can cause erratic behavior and safety concerns. I drove it home and 2 days later, I disconnected neg. 5 days ago i got stuck key in the lock cylinder with start position. If the part store has one in stock, go get it immediately. I recently changed the serpentine belt and air filter for a trip. When the TCM has a problem, the shifting of the vehicle will also have a problem. Find out about common symptoms of a malfunctioning TCM, how to diagnose Transmission Control Module issues, the causes behind TCM failures, and ways to keep your transmission running smoothly. Apr 25, 2025 · To test the performance of your Duramax TCM, a voltmeter is an essential tool. so i removed the ignition switch to turn of the car. Nov 16, 2023 · https://amzn. DTC U010 is Oct 5, 2011 · Document ID: 2074199 #PIP3605A: CTC U0101 No engine crank and no communication with TCM Feb. Complete failure of the TCM will cause failure to shift gears or start the vehicle. Know the symptoms of a bad transmission, starting with… Jun 5, 2023 · Hi all, The transmission of my 2017 z71 duramax failed with little warning last Thursday, 74,000 miles on the odo. From 2008 thru 2015, Chevrolet and GMC 2500 & 3500 trucks with the 6. The first replacement tcm was bad too, so more I’m in a few waiting lists for a new one. I’m going through the same deal with my 2014. 0L LZ0 Duramax https://runvse. Transmission stuck in gear? Maybe an easy fix! Watch Wade check the TCM and install a Synapse Remanufactured Allison TCM on a 2010 Chevy truck! 🔥These TCM’s are 100% plug and play. I know its not uncommon to get a bad TCM on an lml, but it almost seemed like a loose wire. A few TCM's have been returned from the field for analysis because of the above symptoms. It only seems to act up once the TCM (mounted on r Jan 9, 2024 · Symptoms of a bad TCM include the AT dashboard light, hesitating or jerking shifts, transmission overheating, unresponsive accelerator, poor fuel economy, and high RPM. The field returned TCM's 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. At some point, that issue was addressed by gm with a better harness but a crappier tcm. Since returning i have had 2 instances first thing in the morning when i start it. Sep 22, 2025 · Common symptoms of a failed Allison 1000 TCM include communication loss, diagnostic trouble codes, failure to shift gears, harsh or erratic shifting, and the vehicle being stuck in third gear. Jan 16, 2008 · The Transmission Control Module (TCM) calculates the frequency of these AC pulses and converts it to a speed value. 6L Duramax engines. Had the service 4x4 light acting up 4-6 months ago, but that quit being a problem, so I forgot about it. I have some pretty standard symptoms, a U0101 code (loss of comm with TCM), ABS light on, E Brake light on, no indicator under gear selection symbols, and I am stuck in what feels like third gear. When replacing the TCM it is important to reprogram it. Common Symptoms of TCM Failure in GM Vehicles Based on expert insights and reports from GM owners, here are the typical signs of a bad TCM: Jan 22, 2025 · Discover common Duramax diesel problems across generations, including LB7, LBZ, LML, and LMM Duramax problems, with tips for every model. 6 L Duramax engine and Allison 1000 transmission all used the same TCM; part number 24256861. Jan 21, 2019 · In this video I have a look at a 2009 GMC 2500 that is exhibiting some really strange transmission issues. I checked for harness rub, found nothing, i'm thinking the ecm is bad now Tcm on my 2013 took a dump as well. Went out to my truck started it and shifted it into drive. There are posts on duramax forums about checking the pins on the tcm harness since they tend to back out or get loose. The back-up sensors start beeping and the brake, ABS, check engine lights come May 12, 2025 · Limp mode (aka reduced engine power mode) is a self-protection feature in your Duramax’s ECM or TCM. Nov 10, 2018 · So I did some searching, found several others with similar problems but no clear solutions, so here goes Vehicle: 2003 Dmax 3500 DRW / Allison 1000 Issue: Temp gauge likes to instantly go from 0/cold to 300/max and flash "TRANSMISSION HOT IDLE ENGINE" and scream at you, and put the trans Jul 29, 2016 · A multimeter won't tell you if the battery is bad.

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