Overview
The 6.6L Duramax L5P Transmission TCM Tuning Kit is designed for 2017-2026 Chevrolet Silverado and GMC Sierra 2500 and 3500 trucks equipped with the 6.6L Duramax L5P diesel engine. This Black Bandit tuning bundle provides a calibration file for the existing transmission control module (TCM), allowing adjustments to shift schedules, shift points, torque converter lock-up parameters, and transmission line pressure. The bundle includes a year-matched tune file, four OBD2 tuning credits, and a vehicle license. A compatible MPVI3 or MPVI4 tuning interface is required and sold separately.
Vehicle Fitment
| Year Range | Make | Model | Engine | TCM | Transmission |
|---|---|---|---|---|---|
| 2017-2019 | Chevrolet / GMC | Silverado 2500/3500; Sierra 2500/3500 | 6.6L Duramax L5P Diesel | T87A | 6-speed and 10-speed |
| 2020-2026 | Chevrolet / GMC | Silverado 2500/3500; Sierra 2500/3500 | 6.6L Duramax L5P Diesel | T93 | 10-speed |
Fitment Note
- Compatible with 2017-2026 Chevrolet Silverado and GMC Sierra 2500 and 3500 trucks equipped with the 6.6L Duramax L5P diesel engine, subject to the specified TCM and transmission configuration.
- Gas-engine applications are not supported.
- Verify the model year, transmission, and TCM type before ordering.
- A compatible MPVI3 or MPVI4 tuning interface is required but is not included.
Key Features
- Existing TCM Compatibility: Designed to tune the existing T87A or T93 transmission control module without requiring a replacement module for supported applications.
- Black Bandit Calibration File: Includes a year-matched transmission tune file for the supported L5P application.
- Revised Shift Schedules: Adjusts transmission shift scheduling to suit modified diesel powertrain configurations.
- Adjusted Shift Points: Revises upshift and downshift thresholds beyond factory calibration settings.
- Torque Converter Lock-Up Adjustments: Allows revised lock-up parameters for operation under varying load conditions.
- Transmission Line Pressure Calibration: Adjusts line pressure parameters for the intended tuned application.
- OBD2 Tuning Credits Included: Includes four credits for flashing the supplied calibration through a compatible interface.
Performance Benefits
- Transmission Calibration for Modified Powertrains: Allows transmission settings to be adjusted to better match the vehicle's engine setup and operating demands.
- Shift Behavior Adjustments: Revised shift points and schedules can tailor transmission behavior to the intended driving and load conditions.
- Torque Converter Control: Adjusted lock-up settings provide additional calibration options for load management and converter operation.
- Line Pressure Calibration: Revised pressure settings can support the transmission's operation in a tuned configuration.
- No Replacement TCM Required: Supported functional T87A and T93 modules can be licensed and tuned directly according to the supplied product information.
What's Included
- 1 × GM Duramax L5P TCM Black Bandit Tune File, matched to the selected application
- 4 × OBD2 Tuning Credits
- 1 × Vehicle License
Required Equipment Not Included
- A compatible MPVI3 or MPVI4 OBD2 tuning interface is required to flash the included tune file.
- The tuning interface must be purchased separately unless obtained through another eligible package.
- View the OBD2 Flash Tuning Interface.
Technical Specifications
| Item | Description |
|---|---|
| Product Type | Transmission control module tuning bundle |
| Engine Compatibility | 6.6L Duramax L5P Diesel only |
| Model Years | 2017-2026 |
| TCM, 2017-2019 | T87A — 6-speed and 10-speed applications, as listed in the supplied compatibility information |
| TCM, 2020-2026 | T93 — 10-speed applications |
| Tuning Credits | 4 OBD2 credits included |
| Tuning Interface | Compatible MPVI3 or MPVI4; sold separately |
| Hardware Replacement | Not required for supported, functional existing TCMs |
| Intended Use | Off-road use only |
| Return Policy | Final sale; non-refundable |
TCM Update Information
| TCM Type | Model Years | Update Information |
|---|---|---|
| T87A | 2017-2019 | According to the supplied product information, existing T87A modules can be licensed and tuned directly without a hardware upgrade as of early 2026. |
| T93 | 2020-2026 | According to the supplied product information, a separate send-in service or upgrade kit is no longer required as of March 17, 2026; supported modules can be licensed and tuned through OBD2. |
Installation & Additional Details
- Connect a compatible MPVI3 or MPVI4 tuning interface to the vehicle's OBD2 port.
- The existing TCM is intended to be detected through the OBD2 connection for the supported tuning process.
- Provide the tuning interface serial number at checkout so the four included credits can be registered to the device, as specified by the supplier.
- Confirm the correct vehicle year, TCM type, and transmission configuration before purchasing.
- This bundle is intended for tuning existing, functional TCMs. It does not include a physical replacement module.
- Review the supplier's tuning instructions and confirm compatibility before flashing the calibration.
Important Purchase Notice
- Final sale — non-refundable.
- Confirm the vehicle application and ensure you have access to a compatible MPVI3 or MPVI4 tuning interface before ordering.
- This product is specified for off-road use only. Check applicable laws and emissions regulations before use.
Frequently Asked Questions
Do I need to buy a new TCM?
No. This bundle is designed to work with an existing functional T87A TCM for supported 2017-2019 applications or a T93 TCM for supported 2020-2026 applications. The compatible interface, tune file, credits, and vehicle license are used to tune the existing module.
What is the difference between the T87A and T93?
The supplied compatibility information lists the T87A for 2017-2019 L5P trucks with 6-speed and 10-speed transmission applications, and the T93 for 2020-2026 L5P diesel trucks with 10-speed transmissions.
Do I need a separate upgrade for the T93?
According to the supplied product information, as of March 17, 2026, a separate T93 upgrade service or kit is no longer required for supported applications. The existing module can be licensed and tuned through OBD2 using the appropriate equipment.
Does this bundle fit gas-engine trucks?
No. This bundle is intended for Chevrolet Silverado and GMC Sierra trucks equipped with the 6.6L Duramax L5P diesel engine.
Is the MPVI tuning interface included?
No. A compatible MPVI3 or MPVI4 OBD2 tuning interface is required but must be purchased separately unless obtained through another eligible package. View the tuning interface.
How are the four included tuning credits registered?
The supplied instructions state that you should provide your tuning interface serial number at checkout so the four credits can be registered to your device.
Can I return this product?
No. This product is listed as final sale and non-refundable. Confirm the vehicle year, TCM type, and required tuning interface before placing your order.
What if my TCM is damaged or defective?
This bundle is intended for tuning an existing functional TCM and does not include a physical replacement module. Contact the supplier separately for assistance with a damaged or defective TCM.
Shipping
Free shipping on tuners. We aim to dispatch in-stock orders within 2 business days. Most North American orders arrive within 2–7 business days after dispatch via expedited ground. International orders typically take 5–14 business days, depending on destination and customs.
Transit time starts when your order ships, not when you place it. Weekend orders are processed the next business day. Orders shipping outside Canada may be subject to import duties and taxes, which are the customer’s responsibility on delivery. See our shipping policy for full details.
Items Eligible for Return
These items can be returned within 30 days of the purchase date if they are unopened, unused, and in their original packaging:
- Tuning devices: an unopened, unused Mini Maxx V1/V2 or a blank EFI Live device.
- Cables and device accessories: an unopened, unused switch, bypass cable, universal pyrometer, or docking station.
Final Sale
The following items are final sale and cannot be returned:
- Custom tuning: additional tune files purchased separately, and custom tuning purchased with a device.
- Exhausts and race pipes: including downpipes purchased separately from an exhaust or race pipe.
- EGR kits.
Manufacturer Warranty
Every item we sell includes a 90-day manufacturer warranty. An item returned for a manufacturer defect can be refunded in full, exchanged, or replaced with a similar item of equal or lesser value.
Eligible items returned for any other reason follow the same options — a full refund, an exchange, or a replacement of equal or lesser value — as long as the item meets the requirements above.
Return Process
Every return must be approved before it is sent back. Email support@dynamicdiesels.com or call 1-877-600-5667 and we’ll issue a valid Return Merchandise Authorization (RMA) number and a prepaid return label.
Do not send anything back without an approved RMA and the return label we provide. Returns sent without both will not be accepted or processed. See our refund policy for full details.
Warranty
All tuning devices come with a 90-day manufacturer’s warranty from the date of delivery. You have a full 90 days from delivery to start a warranty claim if an issue arises. We also honor all applicable manufacturer warranties on the products we sell; coverage period and claim process vary by brand and product category.
To start a claim, email support@dynamicdiesels.com or call 1-877-600-5667 with your order number. We may ask a few questions about the device to confirm the fault, and we may request proof of communication with the manufacturer, as they are often the primary contact for device issues.
Once your claim is approved, you can choose one of the following:
- Return for replacement: Send us the faulty device, and once we receive it we’ll dispatch a replacement of the same or a similar device of equal or lesser value.
- Return for refund: Return the faulty device and we’ll refund the original payment method. Please allow 3–4 business days for the refund to appear.
- Return for gift card: Receive a gift card for the faulty device, sent to the email on file and available to use right away.
You’ll receive a Return Merchandise Authorization (RMA) number and a prepaid return label to send the faulty device back. See our refund policy for full details.
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