The GM E41 ECM upgrade kit relies on a dedicated M8 HPTNET cable to communicate between the upgrade box and the vehicle's control module during the upgrade process. The HP Tuners H-003-01 is a standalone replacement of that same cable, intended for 2017-2025 Chevrolet Silverado and GMC Sierra 2500 HD and 3500 HD trucks equipped with the 6.6L Duramax and an E41 ECM, for owners who need a spare after the original upgrade kit cable is lost or damaged.

HP Tuners H-003-01 Technical Specifications:

• Matches the M8 HPTNET cable included with the GM E41 ECM upgrade kit, with identical connectors and pinout.
• Built for 2017-2025 Chevrolet Silverado and GMC Sierra 2500 HD and 3500 HD trucks with the 6.6L Duramax and E41 ECM.
• Functions as a standalone spare or replacement without requiring purchase of a full upgrade kit.

Emissions Disclaimer

HP Tuners designs and manufactures software and hardware tools for vehicle diagnostics, scanning, logging, calibration, and data acquisition purposes. The authorized use of such tools is to bring a motor vehicle into emissions compliance and/or to maintain emissions compliance, as well as for use on competition/racing and other exempted vehicles. HP Tuners does not create or provide tunes or pre-made calibrations.

HP Tuners' Terms of Use, policies, and agreements mandate that users shall comply with all local, state, and federal laws. In using HP Tuners software and hardware tools, you are representing, warranting, and agreeing not to use, employ or allow any HP Tuners tools to operate as a defeat device or to violate emissions compliance in any manner whatsoever. You further represent warrant and agree that the HP Tuners tools shall only be used by manufacturers, calibration businesses, and professionals to develop emissions-compliant and/or exempted calibrations.

Emissions Note:

This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART