Edge 85400-261 Evolution CTS3 with Locksmith Device | 2020-2023 GM 6.6L Duramax L5P

Features:

• ECM and TCM unlock from the cab
• Adds up to 125hp and 275tq to wheels
• Includes 10-speed transmission tuning
• Features user-adjustable throttle boost
• Four selectable tuning levels included
• Displays regen status, EGT, boost, temps
• Supports manual DPF regeneration command
• Speedometer calibration for 26-38” tires
• Reads and clears diagnostic trouble codes
• Adjusts speed and RPM limiters
• Includes Allison transmission relearn feature
• Designed for daily driving and towing

Revolutionary Tuning Device for GM 6.6L Duramax

If you've been waiting for a true all-in-one tuner and monitor for your L5P Duramax, the Edge Evolution CTS3 with Locksmith Device is exactly what you've been looking for. Designed specifically for 2020–2023 GM 6.6L Duramax trucks, this setup gives you full control over your truck’s ECM and TCM—right from the cab. Whether you're looking for real power gains, better drivability, or just want to monitor everything your truck is doing in real time, this system delivers across the board. The CTS3 itself is Edge’s most advanced touchscreen monitor and tuning platform. It offers massive performance gains—up to 125 horsepower and 275 lb-ft of torque at the wheels—along with enhanced throttle response, quicker turbo spool, and better efficiency. You can choose from four tuning levels tailored to different needs, including Economy, Tow, Performance, and Extreme. Each level is carefully calibrated to offer strong, clean power while remaining DPF-friendly.

Locksmith Device Gives You More Control

What really makes this package unique for L5P owners is the inclusion of the Edge Locksmith device. GM’s newer ECMs are notoriously locked down from the factory, and the Locksmith is the tool that makes unlocking possible. It allows the CTS3 to flash custom calibrations into the truck—something that previously required mailing your ECM in or swapping to a different unit. With the included cables and unlock sequence, you can perform the entire process from your garage. Once unlocked, the CTS3 gives you far more than just tuning. It lets you monitor a wide range of engine parameters, including regen status, EGTs, boost, fluid temps, and miles since last regen. You can command a manual DPF regen, recalibrate the speedometer for larger tires (up to 38"), adjust the idle, speed and rev limiters, and even perform an Allison transmission relearn. The interface is sharp and responsive, making it easy to use on the fly or during towing.

Fits: 2020, 2021, 2022, 2023 GM 6.6L Duramax L5P

Application Notes:

• Device can unlock and tune only one vehicle. Once the ECM is unlocked and flashed, the flash can be returned to factory settings, but the Unlock process can not be reversed. If VIN lock and ECM Unlock has been completed, device is non-returnable
• It is strongly recommended that a battery charger be used during the ECM/TCM Unlock to ensure no voltage drop interrupts the process leaving an ECM in-operable.

Emissions: This product is NOT LEGAL FOR SALE OR USE IN THE STATE OF CALIFORNIA. Testing with the California Air Resources Board, in order to achieve 50-state compliance, is pending with CARB. Once testing is complete with California, and an E.O. number is issued, this product will be updated to 50-state legal status.

CTS3 Guide

Unlock Steps