Dieselr RTD4 Tune Files (2024-2026 Duramax L5P 6.6L) - Global B

Dieselr 2024–2026 L5P RTD4 Tune File – Global B E42 ECM

The 2024–2026 L5P RTD4 Tune File that customers have been waiting for is now available. This is a single-level, up to +180HP custom tuning file created for the 2024–2026 6.6L Duramax L5P equipped with the latest E42 (Global B) ECM. It’s written for the Dieselr RTD4 platform and designed to deliver clean, reliable power with no guesswork.

Tuning works on RTD4 or MPVi4 TDN (Tune Delivery Network), giving you full flexibility with Dieselr-approved interfaces.

To run this file, your ECM must be unlocked using the Dieselr E42 Upgrade Service. We require your VIN before purchase, and you’ll complete a tuning form after unlock.

Quick Overview

• Up to +180HP single-level L5P tune
• Built for Dieselr RTD4 and compatible with MPVi4 via TDN (sold separately)
• Requires 8 Dieselr credits to flash
• ECM unlock required (E42 Global B platform)
• No SOTF support or alternate power levels
• Speed limiter removed
• CAN bus plugs not yet available — CAN Bus Systems (NOx & DEF) must remain plugged or tied in place; functionality is unaffected
• Free updates included for single-file buyers

MPVi4 / RTD4 Technical Details

• Delivered via Tune Delivery Network (TDN) for secure and easy installation
• Compatible with RTD4 and MPVi4 interfaces
• High-speed, reliable flash and logging capabilities
• Works with thousands of supported vehicles and controllers (Global B E42 ECM)
• Optimized for real-world towing, hauling, and performance applications
• Designed to complement Dieselr engine and TCM tuning

What This Tune Improves

• Optimized engine torque and horsepower for clean, predictable power
• Improved throttle response and drivability under load
• Maintains ECM integrity and reliability
• Seamlessly integrates with Dieselr transmission tuning (if applicable)
• Removes factory limitations such as speed limiter and unnecessary torque reduction

This is the official launch of Dieselr’s first tuning file for the 2024–2026 L5P Duramax. If you’re ready to start tuning your E42 truck, this is your entry point.

Order your 2024–2026 L5P RTD4 Tune File from Dieselr now and get tuned the right way.