The Range AFM/DFM Disabler is a plug-and-play OBD-II device that disables General Motors Active Fuel Management (AFM) and Dynamic Fuel Management (DFM), keeping the engine in full-cylinder mode (all cylinders active) instead of switching to reduced-cylinder operation. It also disables Auto Start/Stop. The device does not reprogram the factory ECU and leaves no trace, so unplugging it returns the vehicle to stock. This unit has a blue LED; LED color is cosmetic only and does not change how the device works. Made in the USA.
- Type: AFM/DFM Disabler
- Connection: Plug-in OBD-II
- Function: Disables AFM and DFM (holds full-cylinder mode)
- Also disables: Auto Start/Stop
- ECU: No reprogramming, leaves no trace
- LED color: Blue (cosmetic only)
- Fuel type: Gas
- Origin: Made in USA
- Sold as: Each
Fits GM V6 and V8 vehicles equipped with Active Fuel Management (AFM) or Dynamic Fuel Management (DFM), including cars, trucks and SUVs (for example 5.3L and 6.2L 10-speed applications).
Does not support 2022.5 and newer Refresh model trucks or 2021 and newer SUVs. On a 2022 model truck, confirm compatibility by VIN: the 12th digit must be '4' or lower.
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
FAQ
What does the Range AFM/DFM Disabler do?
It disables GM Active Fuel Management (AFM) and Dynamic Fuel Management (DFM) so the engine stays in full-cylinder mode, and it also disables Auto Start/Stop.
How does it install?
It plugs into the vehicle's OBD-II port and begins working right away. No tools, wiring or tuning are required.
Does it reprogram my ECU?
No. It does not reprogram the factory ECU and leaves no trace; unplug it to return the vehicle to stock.
Does the LED color change anything?
No. Red, Green and Blue units are identical in function; the LED color is cosmetic.
Is this a genuine Range part?
Yes. It is a genuine Range Technology AFM/DFM Disabler.
