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GM Duramax L5P – TCM Tune (2017-2023)

Tuning Credit
Sku: L5P-TCM-Tune
Vehicle Fitment:
2017-2023 L5P GM Duramax
Chevrolet Silverado / GMC Sierra 2500/3500 6.6L
Regular price
$329.99 USD
Regular price
Sale price
$329.99 USD
Shipping calculated at checkout.
Only 79 items in stock! Out of stock!


Notification for the incorrect product/variant will be listed here.

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Within the device vehicle info section, look for the value with the text containing "14C204":

Once you receive the device, please contact us with your serial number, VIN, and ECU strategy so we can create the custom tunes and send it to you for tuning your vehicle.



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Vendor: Tuner Depot


For off-road use only

Image is for demonstration purposes only. Actual device may vary in color and branding

Superior Transmission Control: L5P TCM Tuning Files

Discover a tailored TCM tune exclusively for 2017-2023 L5P GM Duramax Silverado & Sierra 2500/3500 6.6L pickup trucks. Experience a perfect blend of robustness and enhanced driving experience.

What's on Offer:

  • Revamped shift schedules for impeccable drivability.
  • Modified shift points to consistently stay in the engine's boost range.
  • Finely-tuned shifts for a smoother ride.
  • Optimized torque converter lock-up settings.
  • Adjusted transmission line pressure, complementing your enhanced engine performance.
  • Sturdier shifts to increase transmission lifespan.

GM Duramax L5P – TCM Tuning Upgrade Kit

The Essential Components for Tuning:

To get the most out of this TCM tune file, you will need:

Upgrading your TCM has never been easier! We've bundled everything you need in one comprehensive package. Whether you're an enthusiast or a pro, our GM Duramax L5P – TCM Tuning Upgrade Kit is tailor-made for your 2017-2023 truck. It offers unbeatable value, combining essential components and tuning prowess to unlock the true potential of your vehicle. Dive into peak performance with a single click!

    Ready to Tune?

    If you're gearing up to utilize this tune file, we've got you covered:

    Always ensure you input your OBDii Flash Delete Tuning Interface's serial number when purchasing credits. Let Tuner Depot elevate your driving experience to new horizons!

    *Please review the Terms & Conditions, as well as our Shipping Policy below.*


    • Off-Road Use Only: The products sold on this website are intended for off-road use only, and may not be legal for use on public highways where pollution control laws apply.
    • Check Local Laws: Before purchasing and installing any of these parts, please check your local and state laws to confirm whether the modifications are legal in your area.
    • Professional Installation Recommended: These kits and parts are strongly recommended to be installed by professional mechanics only. Improper installation may lead to performance issues or damage to your vehicle. Please note that, unless specified differently on the product page, our parts do not include installation instructions. Our components are intended for individuals with a proficient understanding of mechanical systems and procedures. Like many aftermarket parts compatible with a variety of vehicles, minor adjustments or modifications may be necessary during the installation process. We cannot accept returns or offer refunds on the basis of an inability to complete the installation due to the absence of instructions.
    • Warranty: The use of these parts will void the warranty of your vehicle. Please confirm with your vehicle manufacturer before purchase and installation.
    • No Liability: Tuner Depot is not responsible for any damage or issues that may arise from the use of these parts.
    • Product Images: Product images are for illustrative purposes only and may differ from the actual product due to manufacturer design changes or improvements.
    • No Performance Guarantees: While these parts are designed to enhance the performance of your vehicle, no guarantees are made regarding the specific performance gains that will be achieved.

    Shipping Policy

    At Tuner Depot, we understand the importance of timely delivery when it comes to your performance parts. We are committed to ensuring a seamless shipping experience, striving to dispatch your orders with utmost efficiency and speed.

    Our Shipping Policy: Our aim is to dispatch all orders within two business days, providing you with a quick and efficient processing time. However, please bear in mind that unforeseen circumstances beyond our control may occasionally impact shipping times.

    Factors Affecting Shipping:

    Weather Conditions: While we pride ourselves on our fast and efficient order processing, adverse weather conditions such as rain, snow, or sleet may affect delivery timelines. We assure you that we will make every effort to overcome such challenges and minimize any delays.

    Holiday Periods: Even our dedicated team needs a well-deserved break during holidays. Please note that our shipping center will be closed on such occasions. Rest assured, we will resume shipping promptly on the next business day. During peak holiday seasons, please allow for potential delays, but be assured that we will keep you informed every step of the way and work diligently to deliver your order as swiftly as possible.

    Staff Availability: While we have an exceptional team, we recognize that unforeseen circumstances can occasionally affect our staffing levels. In such cases, we may experience minor delays. However, we want to assure you that we are committed to swiftly resolving any staffing issues and maintaining our high standards of service.

    We genuinely appreciate your understanding and patience during any unexpected obstacles we may encounter along the way. Be assured that we will utilize every resource available to deliver your performance parts to you promptly.

    Thank you for choosing Tuner Depot, where our passion fuels our commitment to outstanding customer service.

    Happy tuning!