24266710 TCM Repair

Lifetime Warranty
Free Shipping
2 Day Turnaround Time
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Product Details

This is a repair service for an Allison TCM (Transmission Control Module), part number 24266710, found in Chevrolet and GMC trucks with 6.6L Duramax engines.  The T14 and A50 TCM that controls the Allison 1000 transmission has a high failure rate most commonly seen in LMM & LML Duramax trucks.  We have thorough in-house testing and can address wire bonding and other root causes of the TCM failure to ensure that it is rebuilt to withstand the high temperatures of the engine compartment. Our repair service avoids the costly fees of programming a replacement TCM. 

Common symptoms include:

  • U0101 - Lost communication with TCM
  • TCM not powering on
  • Cannot shift gears

Models we repair:

  • 2009 - 2015 GMC Sierra 2500HD 6.6L Duramax
  • 2009 - 2015 GMC Sierra 3500HD 6.6L Duramax
  • 2009 - 2015 Chevrolet Silverado 2500HD 6.6L Duramax
  • 2009 - 2015 Chevrolet Silverado 3500HD 6.6L Duramax
Vehicles with T14 or A50 Allison TCM

Just reinstall the Allison TCM on your vehicle, and you’re back in business!

Please contact us at 800-547-2049 if you have any questions.

Benefits of our Repair 

  • 2 business day turnaround
  • Lifetime warranty
  • World class customer support
  • No programming required

Part Numbers

Below are a list of known model numbers. This is NOT a complete list so if you do not see your part number listed please call us at 800-547-2049.

19431596 24256861 24259874 24257038 24266710


How This Works

At Circuit Board Medics, our focus is on quality repairs, fast turnaround, and excellent communication. One key to achieving these goals is ensuring that we have customers' contact information and payment before beginning any repair order. Disclaimer: We are not responsible for lost, delayed, or non-repaired items shipped to our facility without an order number.

When you need a repair, follow these simple steps:

  1. Find your product on our website.
  2. Match your symptoms with our descriptions.
  3. Place your repair order.
  4. Ship your item to us.
  5. We'll repair your board and ship it out to you!


Lifetime Warranty

Our no-hassle warranty covers the functionality of your module for life. This warranty is non-transferable and applies only to the original purchaser.

For instrument clusters, if any of your gauges or odometer display fail, we will repair them again. In the rare occasion that the item is not repairable, we will either replace the circuit board entirely or refund the cost of the repair, at our discretion. **Light bulbs in instrument clusters have a limited lifespan, and therefore are excluded from this warranty coverage. If light bulbs fail after repair, we will be happy to replace them for a nominal fee.**

Circuit Board Medics LLC is not liable for and hereby excludes any and all indirect, incidental, special, or consequential damages related to the use of services rendered by Circuit Board Medics LLC. Due to the nature of electronics and circuit board repair, Circuit Board Medics LLC cannot guarantee components and circuitry unrelated to the specific repair of symptoms covered in the description of services. In the event that an item is not functioning properly after repair, the customer will have the option to return it to Circuit Board Medics LLC for further testing. It is the responsibility of the customer to contact Circuit Board Medics LLC for return authorization before returning the item.Shipping fees for items being returned for testing are the responsibility of the customer. If the item has failed due to failed components or faulty workmanship, Circuit Board Medics LLC retains the right of choice to repair the item at no extra charge or offer a refund of the cost of repair initially paid to Circuit Board Medics LLC by the customer. If it is determined that the failure occurred due to external causes (i.e. faulty wiring, improper installation, failed external components, etc.), any guarantee, written or implied, will be considered null and void. Circuit Board Medics LLC is released of all liability, without limitation, for loss of profits, use, income, product, production, increased cost of operation, rental vehicle fees, or other loss arising in connection with the use of services rendered by Circuit Board Medics LLC. In no circumstances will Circuit Board Medics LLC be held liable or responsible for damages exceeding the total cost of repair paid to Circuit Board Medics LLC by the customer. This warranty is non-transferable and applies only to the original purchaser. This warranty is limited by the lifespan of the product or system in which it is being installed (i.e. when an automobile reaches the end of its useful life, a rebuilt instrument cluster cannot be transplanted into a replacement vehicle with continuous warranty coverage). Circuit Board Medics LLC makes no guarantee of the completeness of accuracy of information offered for troubleshooting assistance and will not be held responsible for the improper diagnosis of components by others.