Full DPF/DEF/EGR Delete Kit /w OBD2 Tuning | LM2 Duramax | 2020-2022

3.0 Duramax LM2 Full Delete Kit with OBD2 Delete tuning (2020-2022)

The 2020, 2021, 2022 3.0 Duramax LM2 Delete Kit with OBD2 Tuning provides a complete solution for removing the factory DPF, DEF/SCR, and EGR systems. It eliminates regeneration cycles and emissions-related derates, reduces exhaust restriction, and improves throttle response and drivability through matched ECU calibration and supporting hardware.

What's Included in the 3.0 Duramax Delete Kit

• OBD2 Programming Interface - Connects through the factory OBD2 diagnostic port to read and flash the unlocked ECM. The interface supports custom calibration installation without requiring additional delete tuning kit hardware.

• Six Delete tuning Credits - Includes all programming credits required to license the ECM and install the supplied custom tune. No additional activation credits are required before programming.

• E46 ECM Enhancement & Unlock Service - The factory E46 ECM is professionally upgraded and unlocked to accept custom calibration files. Customers send their ECM to our facility before delete tuning files are prepared.

• Custom Tune File - The supplied 3.0 Duramax tuner calibration is built specifically for your truck using the VIN and unlocked ECM. Two power levels are available: Stock Optimized and Tow (+20 HP).

• 3.0 Duramax EGR Delete Kit - Includes block-off plates, EGR cooler delete components, coolant reroute parts, gaskets, seals, fasteners, and installation kit hardware required to remove the factory exhaust gas recirculation system and cooler.

• 3-Inch Turbo-Back Exhaust - Includes a 3-inch stainless steel turbo-back exhaust system that replaces the factory catalyst, DPF, and SCR assembly while retaining the factory resonator and muffler. All required clamps and installation kit hardware are included.

• CAN Bus Plug Kit - Includes the CAN communication plugs required during programming to maintain proper communication between vehicle modules after the factory emissions equipment has been removed.

• Delete Kit installation instructions - Step-by-step instructions explain ECM removal, shipping procedures, unlock service, programming, and kit hardware installation.

Vehicle Compatibility

The LM2 Delete Kit is designed exclusively for early GM half-ton diesel pickup trucks.

• Years: 2020, 2021, 2022

• Makes: Chevrolet, GMC

• Models: Silverado 1500, Sierra 1500

• Engine: 3.0L Duramax LM2 Inline-6 Turbo Diesel

• ECM Platform: E46 (unlock required)

• Body Style: Pickup

• Fuel Type: Diesel

• Not Compatible With: Late-production 2022 trucks equipped with the E66 (Global B) 

• Not Compatible With: 2023+ LZ0 Duramax

• Intended Use: Off-road and competition vehicles only

Performance & Delete tuning

The LM2 Duramax calibration focuses on dependable daily drivability and towing performance rather than maximum horsepower. The supplied custom tune optimizes the ECM after the factory DPF, DEF, SCR, and EGR systems have been removed.

Expected Benefits

• No forced regeneration cycles

• No DEF refills

• Faster throttle response

• Improved fuel economy

• Lower EGTs under load

• Improved towing performance

• Reduced exhaust restriction

• Increased reliability

Gains by Power Level

Additional Performance Improvements

Which Configuration Should You Choose?

How the Delete Kit Works on Your LM2 Duramax

The LM2 Duramax delete package replaces the factory emissions system with compatible hardware and custom ECM programming designed for the unlocked E46 controller.

• Removes the factory DPF, DEF, SCR, and EGR emissions systems.

• Replaces restrictive exhaust components with a stainless steel turbo-back exhaust.

• Updates the unlocked E46 ECM using the supplied OBD2 programming interface.

• Stops forced regeneration events, DEF monitoring, and emissions-related derate caused by removed kit hardware.

• Delivers improved throttle response, lower EGTs, and more consistent towing performance.

Installation Information

The LM2 delete kit includes detailed mechanical and programming instructions covering ECM removal, the E46 unlock service, exhaust installation, EGR removal, and OBD2 programming. Customers with solid mechanical experience can complete the installation using common workshop tools after the unlocked ECM has been returned.

Technical Specifications

No More Emissions Codes

The supplied calibration disables supported emissions-related diagnostic trouble codes after the factory DPF, DEF, SCR, and EGR systems have been removed and the unlocked E46 ECM has been programmed. The calibration addresses emissions-related faults only and does not repair unrelated engine, transmission, turbocharger, electrical, or mechanical problems.

Common DPF System Codes

Common DEF / SCR System Codes

Common EGR System Codes

Not sure whether your truck uses the E46 or E66 ECM? Send us your VIN, and our diesel specialists will confirm the correct LM2 delete kit configuration-usually within a few minutes.