GMC/Chevy Duramax

Information regarding the unlock of GMC/Chevy Duramax LML first tuning unlock codes.

Why does the GMC/Chevy Duramax require an additional unlock code?
Unlike the VIN Unlock Code that allows a tuner to be used on another vehicle, the Duramax LML First Tune Unlock Code allows for the completion of the Instal...
Wed, 6 May, 2020 at 7:51 PM
Can the GMC/Chevy Duramax transmission be unlocked for tuning?
Unfortunately, H&S Tuners are not able to program GMC/Chevy Duramax truck transmissions. Therefore, there isn't an unlock code for this application...
Wed, 6 May, 2020 at 11:40 PM
Can the GMC/Chevy Duramax tune levels be shifted on the fly?
2011+ Duramax LML's unfortunately can't shift on the fly with H&S tuners. If you want to change the power level, then you will need to go thro...
Mon, 11 May, 2020 at 11:26 PM