gm broke the L9 DFM hack on the 2027 LD.

[gemarsh]

GM Full-Size Truck Chief Engineer Scott Garver confirmed that the new trucks operate differently from their predecessors. Specifically, DFM remains active in every L gear on the 2027 Silverado and Sierra, including L9. As such, selecting L9 no longer prevents the system from deactivating engine cylinders.

 

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[pinebaron]

I have never operated my truck in L gears; guess I never had the need to.

 

[gemarsh]

I have never operated my truck in L gears; guess I never had the need to.

Yeah, the hack was for the LD gasser's. It kept the cylinder deactivation at bay, keeping all 8 firing.