2021–2023 Duramax LM2 / LZ0 3.0L Custom Tune (HP Tuners)

The LM2 and LZ0 Duramax engines are far more capable than the factory programming lets on. Conservative throttle mapping, muted torque delivery, and overprotective logic keep these trucks feeling restrained—especially in everyday driving. Black Label removes the hesitation without compromising composure.

This custom tune for 2021–2023 3.0L Duramax LM2 and LZ0 platforms sharpens throttle response, restores usable midrange torque, and smooths out the inconsistent factory power delivery that makes these trucks feel indecisive. Acceleration becomes clean and immediate, while drivability remains calm and controlled.

Written specifically for HP Tuners, this calibration prioritizes balance. Power comes on deliberately, shifts are refined, and the drivetrain behaves predictably under load. Daily driving improves, towing response tightens, and the truck finally responds when asked—without drama.

This isn’t about peak numbers.
It’s about corrected behavior.

No generic files.
No bloated tune stacks.
No gimmicks.

Black Label tuning is for owners who chose the 3.0L because they value efficiency and performance—and expect both to work together.

Clean torque.
Precise response.
Modern diesel, done right.