Chevy 2500hd LML trouble code U0101 TCM Failure!!!!(FIXED) 

Yep, I just had this same issue happen to me (yesterday) in my 2014 GMC Denali 2500HD - Duramax w/ Allison. After researching for a few hours all signs pointed to Dan’s Diesel Performance TCM as the cheapest and fastest fix. I had a hard time pulling the trigger on a $675 part with $93 overnight shipping so I called them up and spoke with Dan. I ran through my issues and what I had done to test and he was extremely helpful and reassuring. I had the part next day (today) by 11AM and had it installed by 11:05AM. It royally sucks to have the problem but this is definitely the best approach and in the long run likely saved me $300-500. Not to mention if I had taken to a shop i would have been without my pickup for at least 3-5 days. Install is super easy by the way...no tools required for my pickup. Thanks for posting this vid! Dan...if you see this... thanks for rushing the part to me even though i called you 10 min before the shipping cutoff!

Another satisfied customer!. I, like the author of this youtube had weird issues with my Allison transmission of my 2013 Chev Duramax. Operating in what appears to be "limp" mode at first, then after sitting for the night, no pull on the trans. Sending codes such as traction control, stabiltrack. After watching this broadcast and others similar, I called Dan's Diesel. This was yesterday at 2:30 Central time, order it from Dan, had it overnight shipped for additional 77 bucks, received it at 10am next morning, swaped out, (2 minute ordeal.....plug and play) , cranked truck and whamohoo, trucks runs and shifts like a spotted ass ape. Mechanic quoted $1200 repair plus 150 wrecker bill. This is no B.S. Works and it is easy. Now I will spend the 400 or so on Budweiser.

Lookout Sir!! I found myself in the same situation!! I came across this video and followed your lead!! Next day shipping got my truck running the next day!! Much love to you for taking the time to post this very informational video!! My truck is shifting better than it ever have!!! Thanks again!!

Thanks, I just talked to Dan and ordered one myself. You saved me a ton of money. Thanks again and God Bless. The exact thing happened to me, only blessing was that I got home in first gear.

Look up Circuit Board module they do a great job. Repairing them took me on a roll over a week to get it back.

Thanks man. I needed one and got it from Dan's and works great.

I have a 09, 2500HD with the same code U0101. I fell into a not so big of a hole with my right tire and then stopped at a gas station to inspect it. After I left gas station, my truck went on "limp mode", meaning my truck bare accelerated as much as I was pressing down on the gas pedal. Drove it like that a few blocks till I grabbed a little down hill road and at 28 MPH I was able to accelerate as normal but when I came to a stop and tried to accelerate again, truck went back to "limp mode". Finally got it towed. Next morning, turned truck on and no codes where showing on dash so decided to take it for a ride and drove just fine for a few miles till it went back to limp mode. Disconected TCM for about 15 - 20 minutes and plugged back in and truck drove fine again. Went back home but just before I arrived, it went back to limp mode. How can I make sure I have a bad TCM? I'm thinking I may have a bad ground ir something. I checked out pins and they are all in good shape. Cleaned everything off with electronic cleaner to make sure my problem was not due to dirty connections. Any help? Thanks in advance!

Looks like this TCM is not available any longer. My truck died a couple weeks ago. I found a place that will rebuild it for about $1,200. I wish I could have gotten it from Dan's for $600-$700. They now have it listed at $5,000, but not in stock.

Awsome my truck is tuned and deleted and that range shift scared the daylights out of me the other day and a surgeing idle

Did it send ur stabili Trac and traction control system to go off

Hi im haveing the same issue hows your truck doing now several months later?

I was hoping you would show where it's at at least not just talk about it

Is this a common problem on 1500 2007 Silverado ... just got told today my tcm failure and the pressure silonids failed ..

Trued to unplug mine and i plugged it back in and now it wont go into reverse and gear indicator wont light of and all dash lights are on any ideas

My TCM went out man exactly same way I am all stock motor no tunes etc with 35 inch tires will this work I am about to order my shop can’t tune so I figured this might be better 500 bucks and 100 to flash from dealer it seams like a deal to me also I tow every day and before i noticed it slipping in gear last couple weeks before Total Failure of TCM

Where do you have it?

Did your transmission downshift a little hard at first? How long before it “relearns “ the new TCM?

Do you have a follow up video on this and did it fix your problem completely

I will contact them i live an hour from dans diesel mabe i can get lucky and pick it up from them and flashed

This happened to me today.

I spent 400 at a dealership..

Just completely bubbles talk What a waste of cell data.

Did you fuel mileage change

Where is the tcm location on a 2012 chevy impala ls

Where is the TCM on 1500. 2011 silverado..?

How much u paid for it?