Range Technology RA007 DFM Module for GM Refresh V8 (5.3L/6.2L) — Disables Dynamic Fuel Management & Auto Start/Stop, Plug-and-Pla

Instead of letting the factory cylinder-deactivation and auto stop/start systems change how your V8 behaves, the RA007 intercepts signals at the ECM so the engine runs on all cylinders continuously. Designed specifically for GM Refresh 5.3L and 6.2L V8 engines, this hardware solution aims to improve drivability and reduce the wear patterns linked to repeated cylinder switching and frequent automatic stops. Installation is reversible and leaves no trace for dealer diagnostics.

How does this module affect driveability and engine feel?

With the DFM module installed, the engine no longer switches cylinders during light-load conditions, so throttle response and torque delivery stay consistent. Drivers report smoother acceleration, a firmer low-end pull, and restored V8 sound character when cylinder deactivation is disabled.

• Consistent power—engine uses all cylinders under normal operation
• Eliminates transient hesitations tied to cylinder on/off events
• Restores fuller V8 exhaust tone and reduced unwanted drone

Will this improve long-term engine reliability?

The module is intended to reduce the mechanical cycling and oil-control stresses introduced by constant cylinder deactivation and restart events. By maintaining all cylinders active, components that can be vulnerable to repeated switching—like lifters, spark plugs, and certain valvetrain parts—experience a more uniform operating environment.

• Reduces variable loading that can accelerate wear on lifters and valvetrain
• Less frequent cylinder switching may lower risk of spark-plug fouling
• May help prevent oil-consumption patterns associated with DFM modes

How is the RA007 installed and will it affect dealer service?

Installation is a plug-in inline connection to the vehicle’s ECM harness and requires no permanent modifications. The module is fully removable and designed to allow a complete return-to-stock appearance and function for warranty or dealer inspections.

• Plug-and-play inline harness; no cutting or splicing required
• Removable without leaving hardware or programming traces
• Does not alter engine control software—reverts when disconnected

Does it also stop the Auto Start/Stop feature?

Yes—the RA007 simultaneously disables the engine Auto Start/Stop system so the engine will not shut off at stops, eliminating restarts that can interrupt cabin systems or cause takeoff hesitation. This combined suppression of DFM and Auto Start/Stop is handled through the same inline integration with the ECM signals.

• Prevents automatic shutdown at stoplights for uninterrupted power
• Helps maintain cabin accessories and HVAC function during stops
• Works alongside the DFM disable for consistent, uninterrupted V8 operation

Who is this for: The RA007 is intended for owners of 2021–2024 GM Refresh SUVs and 2022.5–2024 GM 1500 Refresh trucks equipped with 5.3L or 6.2L V8 engines who want more consistent throttle response, the full-time V8 feel and tone, and a reversible hardware solution that leaves no permanent footprint. It is aimed at drivers who prefer a predictable, all-cylinder driving experience and those concerned about long-term wear patterns associated with factory cylinder-deactivation systems. Note: this product contains materials that, per California law, may expose users to chemicals known to cause cancer or reproductive harm.