Density Speed and Performance - HP Tuners Custom Tuning - 2024-2026 L5P Duramax

Custom Tuning built for your 24+ L5P Duramax to suit your build, loaded via HP Tuners.

ECU Unlock is Required.

In order to start tuning, your truck requires this one-time, send-in upgrade service to upgrade the E42 ECM for custom tuning using our VCM Suite software.

Spare ECMs will NOT BE ACCEPTED, no exceptions. Only the original ECM from your vehicle is acceptable for this service.

This means your E42 ECM must be removed from your truck and shipped to HP Tuners’ headquarters for servicing. This process takes up to 7 business days to complete (not including shipping

TCM Tuning Add-On

Revised shift schedule to improve drive-ability

Improved shift timing

Re-designed torque converter lock-up strategy

Allows power transfer from the engine to the wheels more directly via TCC lock-up