2023 GMC 1500 Sierra Denali 6.2l and DFM

Jus Cruisin · January 8, 2023

Is this "feature" being put in the new trucks. Somewhere I thought I read it's been eliminated. If still in the trucks, is there a work around? Or, just roll the dice and what happens, happens.... Fixing to order a 2023 this spring......i think. Time to get my first GM truck.

SPASierra · January 18, 2023

It is still on the new trucks. When they said it was "removed" on the 2021's, it was only the chip portion that deactivates it. The solenoids and lifters were still the same. While the failure rate seems high, you have to keep in mind that GM makes over 600k trucks per year. The failure rate isn't as high as forums and FB groups make it out to be. Buy it, drive it, and don't baby it.

John813 · January 23, 2023

Yea, the mechanical portion of the lifters are the exact same no matter if your truck comes with the chip or not

I run my truck in L9 to disable the DFM, simply because I don't care for the system, even though there's no guarantee it'll prevent failure.

Jus Cruisin · January 23, 2023

So the truck arrived at the dealership today and it has everything functioning except the steering column lock which I really don't care about. So I'll be experiencing this gm dfm stuff.

Bikerjon · February 12, 2023

DFM can be disabled on your truck. I cannot stand DFM cutting out cylinders.

SPASierra · February 14, 2023

On 2/11/2023 at 10:56 PM, Bikerjon said:

DFM can be disabled on your truck. I cannot stand DFM cutting out cylinders.

Pulsar LT, Range Disabler, and other DFM disablers don't work with the new GM computers. The computers are encrypted with a key that is specific to that computer. Trifecta Performance is the only shop who has successfully done it, but they aren't doing it at scale for anyone yet, and you will have to send them your computer.