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5 Things You Need To Know About LML TCM Tuning!

[fa icon="calendar'] Aug 10, 2017 1:00:00 PM / by Paul Wilson posted in LML, LML Tuning, LML Power, TCM

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2011-2016 Duramax/Allison Equipped Trucks:


If you have a 2011 - 2016 GM diesel pickup truck then you are familar with the Allison 1000 transmission.  With that, you are familar with the strengths and weaknesses of the calibration, or tune that controls it.  

While this model transmission has provided a great platform for smooth shifting and excellent towing, it's not without downfalls as well.  list a few problems that the features will address.

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What Can TCM Tuning Do For Towing with my Duramax?

[fa icon="calendar'] Jul 21, 2017 8:50:00 AM / by Paul Wilson posted in TCM, towing, towing performance, LML TCM Tuning, TCM Tuning, LMM TCM Tuning, LBZ TCM Tuning, LLY TCM Tuning, LB7 TCM Tuning

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How does Allison 1000 TCM Tuning help with towing?

TCM Tuning is the modification to the programming calibration of a Transmission Control Module (TCM).  Ever since 2001 when the Duramax was first offered in the 2500 and 3500 GMC and Chevy  HD truck it has been paired with the Allison 1000 transmission. 

These trucks are designed for towing and if you use it that way, you can probably think of a few ways you would like your transmission to act differently.  That is where TCM Tuning may be able to help.

Learn More About Custom TCM Tuning 

Common Complaints About Stock Transmission Tuning:

  • "When I try to pass and I am in 6th gear, it is very reluctant to downshift."
  • "While merging on the express way it seemed to take a long time to get from one gear to the next. It's even worse with a trailer on."
  • "Even with tow haul mode on the truck doesn't seem to shift well since I put these larger tires on."
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Is your LML TCM Tuned?

[fa icon="calendar'] Mar 23, 2017 4:59:11 PM / by Paul Wilson posted in LML, TCM, LML Performance

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What is LML TCM Tuning?  Do you need it? How does it work?


If you own a 2011 - 2016 GMC or Chevy Duramax (LML) you probably know it is equipped with an Allison 1000 transmission.  You probably know this is one of the most respected transmissions to ever be matched with a diesel engine.   The Allison's smooth shifting and stellar reliability have earned it a special place in the diesel performance community.  

With all the benefits this transmission provides, it's not without it's own short comings.  Many LML owners have noticed there are times when it just doesn't shift they way want it to.  And when LML owners have questions, they know to call DuramaxTuner.com for help.  

Below you will find the 3 most commonly asked questions and answers on this topic.  


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P0700 Codes in your LB7 and LLY

[fa icon="calendar'] Nov 7, 2016 11:50:41 AM / by Paul Wilson posted in DT750, Transmission Duramax, P0700, TCM, Allison, Trouble Shooting

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2001 - 2004.5 Allison 1000 Trouble Shooting

The Allison 1000 5 Speed transmission came in 2001 - 2004.5 heavy duty Chevy and GMC trucks.  At the time it came out it was cutting edge.  Smoother shifting and more robust than almost any other transmission that came from the factory.  

However, they do have a reputation for having issues once power and abuse have been added to the truck.  Most commonly they go into "Limp Mode" during the 4 to 5 upshift or 5 to 4 downshift under hard acceleration.  This will cause a check engine light to come up on your dash and the truck to be limited by power and speed.  When this happens the most reported code is P0700.  GM defines PO700 as Transmission Control Module Requested MIL Illumination.  Simply said, it's a general code for transmission issues and generally is accompanied by another code such as P0701, P0702, and so on.  

Many truck owners' first reaction is to replace the Transmission Control Module (TCM) as soon as this code pops up.  The reality is further diagnosis is needed to tell what the issue is and the best way to resolve it.  Never jump to conclusions and always take into consideration the circumstances behind the issue prior to the code coming up.  

Where can you learn more about P0700 codes in your Duramax?

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