HPT GM E42 L5P Global B ECM Upgrade (ECM UNLOCK) (*VIN & Original ECM Required*)

Unlock Custom Tuning for Your Next-Generation Duramax

Take the next step toward a calibration built around your truck and your goals. The HP Tuners GM E42 L5P Global B ECM Upgrade prepares your original engine controller for custom tuning, diagnostics, and data logging with VCM Suite.

Designed for supported E42-equipped Duramax applications, this one-time, send-in service upgrades your factory ECM so a tuner can access it through compatible HP Tuners equipment. You keep your original controller and gain the tuning access needed to develop a calibration for your specific setup.

Confirmed L5P Truck Applications

• 2024–2026 Chevrolet Silverado 2500/3500: 6.6L L5P Duramax diesel with E42 ECM.
• 2024–2026 GMC Sierra 2500/3500: 6.6L L5P Duramax diesel with E42 ECM.

Additional E42 Platform Support

HP Tuners also supports select 2024+ GM and International medium-duty trucks with the L5D engine and E42 ECM through this service. Its application list includes 2024–2026 Chevrolet Silverado 4500/5500/6500 6.6L L5D Duramax trucks. Confirm the exact VIN, controller, model year, and application with HP Tuners before ordering for a medium-duty truck; shared engine displacement does not establish compatibility.

Not for 2017–2023 Silverado/Sierra 2500/3500 L5P trucks: those require the E41 ECM service instead. This is not an unlock service for gasoline-powered HD trucks or 1500-series diesel controllers.

Why Upgrade Your E42?

• Enable custom calibration: Prepare your supported ECM for tuning with VCM Suite.
• Keep your original controller: Upgrade the ECM already matched to your truck rather than buying a replacement.
• Access useful engine data: Support scanning and data logging as part of the calibration process.
• Retain diagnostic functionality: VCM Scanner, dealer diagnostics, and other diagnostic tools continue to function normally.

Required Equipment and Licensing

• Your VIN and the original E42 ECM removed from your vehicle and shipped for servicing.
• An MPVI3 or MPVI4 interface, sold separately.
• The latest version of VCM Suite BETA and an internet connection.
• 8 Universal Credits to license the upgraded ECM, sold separately.
• A suitable custom calibration, arranged separately.

Know What You Are Buying

This is an ECM unlock service, not a replacement ECM, tuning interface, credit pack, or preloaded performance tune. The service enables tuning access; unlocking alone does not add horsepower or torque. Transmission-controller services and licensing are separate where required.

Only your vehicle’s original ECM is accepted. Spare ECMs are not accepted, without exception. ECMs with broken tabs are also not accepted for upgrades. Plan for vehicle downtime while your controller is away; shipping time is additional to service processing time.

After upgrading, tuning is performed through the OBDII port using the required HP Tuners interface, software, and internet connection. Retain your stock calibration file if you intend to return to stock using VCM Suite.