2017-2026 Duramax HP Tuners MPVI/RTD4 TCM Tuning

Unlock the full potential of your L5P Duramax's transmission with custom TCM tuning from Peakside Performance via HP Tuners.

We require a stock TCM read with HP Tuners if using an MPVI3.

PLEASE EMAIL sales@peaksideperformance.ca. IF YOU ARE USING AN RTD4 Please wait for your invite code to be emailed to you.

L5P TCM Tune:

Higher shift firmness and custom shift points can be tailored to your supporting modifications. Please state your current modifications when ordering.

4 Universal HP Tuners Credits are Required to Flash!