LEMASSON AFM Disabler OBD-II Module for GM V6/V8 (5.3/6.0/6.2L) — Plug‑and‑Play AFM/DFM Disable, Removable, Low‑Power

LEMASSON AFM Disabler is a plug-and-play OBD-II module that disables GM Active Fuel Management/Dynamic Fuel Management so your V6/V8 runs on all cylinders continuously.

If you're driving a compatible Chevrolet, GMC, Cadillac or Buick with AFM/DFM-equipped engines, this compact module offers a simple way to stop the cylinder-deactivation behavior without cutting wires or reprogramming the ECU. The unit installs in minutes, draws negligible current when the vehicle is off, and is designed to be fully removable so it leaves no lasting modifications.

How does the LEMASSON AFM Disabler work with my GM vehicle?

The device communicates with the vehicle through the OBD-II port and sends the signals needed to keep all cylinders active. It does not alter engine management code; instead it intercepts AFM/DFM commands so the lifter deactivation routine is bypassed. Installation is reversible — plug it in, and unplug to restore factory behavior.

• Connects via standard OBD-II port — no splicing or ECU reflashing required.
• Sends steady ‘all cylinders active’ commands to the AFM system.
• Removable design preserves original factory setup for resale or dealer service.

Will installing this unit harm my engine or void warranty?

The LEMASSON module is non-invasive and intended to be a reversible accessory. Because it plugs into the OBD-II port and leaves no permanent modifications, it can be removed without traces. It’s important to check with your dealer about specific warranty interpretations in your region.

• No cutting or hardwiring: original wiring harness remains intact.
• Designed to be unplugged for dealer visits or diagnostics.
• Check manufacturer warranty specifics before installation.

What are the main benefits and practical effects after installation?

With AFM/DFM disabled, your engine will operate on all cylinders continuously, which can restore steady cylinder lubrication and reduce stress on lifter components that can be affected by frequent activation cycles. The module is engineered for minimal battery drain and reliable starts after long parking periods.

• Reduces the risk of AFM-related lifter sticking by keeping lifters active.
• Ultra-low standby power prevents battery discharge during storage.
• Quick install gets your vehicle back to consistent V6/V8 operation in minutes.

Which models and engines are compatible with this AFM/DFM disabler?

LEMASSON provides wide fitment across many Chevrolet, GMC, Cadillac and Buick vehicles. It supports V6 and V8 engines that use GM’s Active or Dynamic Fuel Management systems, including popular trucks, SUVs and performance cars across model years listed for compatibility.

• Common fitments include Silverado, Sierra, Tahoe, Yukon, Escalade, Suburban, Camaro and more.
• Compatible engine sizes include 3.6L, 4.3L, 5.3L, 6.0L and 6.2L variants where AFM/DFM is present.
• Works across model years where AFM/DFM was factory-equipped (see vehicle list for exact years).

Who is this for? The LEMASSON AFM Disabler is aimed at owners of GM vehicles equipped with AFM or DFM who want a straightforward, reversible way to stop cylinder deactivation without ECU tuning or invasive wiring. It suits drivers wanting to protect lifter longevity, restore consistent power delivery, or avoid AFM-related mechanical issues while retaining the option to return the vehicle to factory settings for service or resale.