From 365 hp to about 395 hp: the GMC Sierra 6.6 Duramax 365hp (2014 – 2016) becomes noticeably stronger and more responsive with Stage 1 software. Torque climbs from 894 Nm to about 945 Nm.

This is a diesel engine with a displacement of 6,599 cc and engine code LMM. The engine is controlled by the Bosch EDC16C42 and Bosch EDC17CP18. The software file can be written with tools such as Alientech KESS3 and Dimsport New Trasdata.

Besides Stage 1, the following options are available for this vehicle: Adblue, EGR OFF, DTC Removal, FLAPS, DPF OFF and Vmax.

Frequently asked questions

How much power and torque does a GMC Sierra 6.6 Duramax 365hp gain with Stage 1?

About 30 hp and 51 Nm: from 365 hp / 894 Nm to roughly 395 hp / 945 Nm. The exact gain depends on engine condition and fuel quality.

Which ECU does a GMC Sierra 6.6 Duramax 365hp use?

Bosch EDC16C42 and Bosch EDC17CP18.

Which tools can read a GMC Sierra 6.6 Duramax 365hp?

Alientech KESS3 and Dimsport New Trasdata.

Which extra options are available for a GMC Sierra 6.6 Duramax 365hp?

Adblue, EGR OFF, DTC Removal, FLAPS, DPF OFF and Vmax.

Figures are indicative and vehicle specific. Check the regulations that apply in your country before modifying engine software.