AFM Disabler for GM Vehicles

The TOPDON AFM Disabler is a simple, plug-and-play solution for supported GM vehicles equipped with Active Fuel Management (AFM). Keep the engine in full-cylinder mode to help reduce shudder and maintain smoother, more consistent performance. No ECU modifications or tuning are required. Simply plug the device into the OBD-II port and drive.

Consistent Power. Smoother Driving.

By preventing your engine from switching into cylinder-deactivation mode, the AFM Disabler helps reduce shudder, uneven response, and the disruptions that come with AFM operation. The result is a smoother, more consistent feel behind the wheel.

Plug and Play. Ready in Seconds.

No tools or configuration required. Plug the AFM Disabler into your vehicle’s OBD-II port and AFM is disabled automatically each time the engine starts, helping maintain consistent engine operation from the moment you begin driving.

Help Reduce the Risk of Costly AFM Repairs

AFM systems repeatedly switch cylinders on and off during normal driving, which can cause engine issues in some GM vehicles. The AFM Disabler helps reduce the risk associated with AFM operation and supports more consistent long-term performance.

Unlock Full V8/V6 Engine Performance

Designed for GM vehicles equipped with AFM, the AFM Disabler prevents cylinder deactivation across supported GM models. It delivers consistent engine operation without requiring tuning, configuration, or permanent modification.

Automatic Sleep Mode. Minimal Battery Draw.

With intelligent auto sleep and wake, the AFM Disabler is designed to remain plugged in. It powers down when your vehicle is parked and wakes when you drive, using minimal battery power. Enjoy consistent engine operation without the need to remove the device after every drive.

No Reprogramming. No Permanent Modifications.

The AFM Disabler works without reflashing or altering your vehicle’s ECU. Simply unplug the device at any time to return your engine to its original cylinder-deactivation setting. No AFM elimination or permanent modification is required.

• Working Temperature Fahrenheit: 14℉ to 140℉
• Working Temperature Celsius: -10℃ to 60℃
• Storage Temperature Fahrenheit: -4℉ to 158℉
• Storage Temperature Celsius: -20℃ to 70℃
• Weight (lbs): 0.07
• Width (inches): 1.89
• Length (inches): 2.13
• Height (inches): 0.98