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mataunion
AFM DFM Disabler - V8/V6 Mode 100% of the Time
This item is incompatible with vehicles equipped with a 10-speed transmission. It also will **not fit** 2022 refreshed, 2023 and 2024 Silverado & Sierra trucks.Always verify vehicle compatibility via the Fitment...
Product Overview
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This item is incompatible with vehicles equipped with a 10-speed transmission. It also will **not fit** 2022 refreshed, 2023 and 2024 Silverado & Sierra trucks.
Always verify vehicle compatibility via the Fitment tab prior to placing your order.
- 🚗Extensive Vehicle Fitment: Fits Silverado, Sierra, Tahoe, Suburban & Escalade, covers most stock factory setups from 2007 onwards. Verify your vehicle specs before purchase to prevent fitment issues（Not compatible with 10-speed transmission models or 2022+ Refresh models. Please confirm compatibility before ordering）
- 🔘Equipped with a convenient switch design, allowing you to turn the device on or off as needed without repeatedly unplugging it from the OBD-II port. Easy to use for daily driving or temporary factory-style operation
- 🔧No tools or complicated setup required. Simply plug the AFM/DFM Disabler into the vehicle’s OBD-II port, switch it on, and it begins working automatically. Compact design helps keep the driver area neat
- 🛠️Helps prevent frequent switching between cylinder modes, supporting a smoother and more consistent driving experience. Ideal for drivers who prefer their compatible V6/V8 engine to stay in full-cylinder mode during normal operation
- ❤️Your satisfaction matters to us. If you experience any product quality issue, please contact us for assistance with return or replacement options. Please check your vehicle model, year, and transmission type before purchase
Vehicle Fitment
Our device is incompatible with trucks and SUVs featuring the 2022 design refresh. It works on early 2022 pre-refresh models. Additionally, 2019 and newer vehicles equipped with 5.3L / 6.2L engines paired with 10-speed transmissions are not supported. This unit does NOT fit 2023 or 2024 models, with the exception of Camaro. Please verify your vehicle fitment information below.
Below is our main vehicle compatibility list. This device works for all vehicles with AFM / DFM systems, except for the excluded models mentioned above. Many rare and limited-production vehicles are not included in this list.
Silverado & Sierra 1500
- 2008-2021 models for the 5.3L, 6.0L, and 6.2L
- 2008-2018 for the 4.3L
- Does not fit 2022 "Refresh" models
- Doesn't fit 10-speed transmissions
Colorado / Canyon
- 3.6L V6 engines
- 2015-2020 models
Suburban / Yukon / Escalade /Tahoe
- 2008-2020 models
- 5.3L, 6.0L, 6.2L engines
Chevy Avalanche
- 2008-2013 models
- 5.3L and 6.0L engines
Cadillac Vehicles
- ATS 2013-2019, 3.6L
- CTS 2004-2019, 3.6L, 6.0L, and 6.2L
- CT6 2016-2018 3.0L and 3.6L
- XT5 2017-2019 3.6L
- XTS 2013-2018 3.6L
- SRX 2004-2009 3.6L
- STS 2005-2007 3.6L
Camaro
- 2010-2024 models
- 3.6L V6 and 6.2L V8 engines
Corvette
- 6.2L V8 engines
- 2012-2019 models
Other GM/Chevy/GMC/Buick/Pontiac Vehicles
- Acadia 2007-2008 3.6L
- Impala 2006-2009 3.9L and 5.3L
- Lacrosse 2005-2009, 2016-2018 3.6L and 5.3L
- Malibu 2006-2012 3.6L and 3.9L
- Monte Carlo SS 2006-2007 5.3L
- Trailblazer 2007-2009 5.3L
- Uplander 2006-2008 3.9L
- Ascender 2005-2006 5.3L
- Aura 2007-2009 3.6L
- Blazer 2020-2022 3.6L
- Caprice 2011-2017 6.0L
- Enclave 2008-2020 3.6L
- Envision 2017-2018 2.5L
- Equinox 2008-2009 3.6L
- G6/G8 2007-2009 3.9L, 3.6L, 6.0L, 6.2L
FAQ
Q: Will using this device void my vehicle warranty?
A: No. The device leaves no trace. Simply unplug it before visiting the dealer, and there will be no evidence it was installed.
Q: What does the LED light mean?
A: When you first plug in the device, the light blinks to indicate power and an attempt to connect to the vehicle. A red light means power is present (blue light for the switchable version). Blinking green (blue light for the switchable version) confirms successful connection and normal operation. The green light (blue light for the switchable version) will keep blinking while the vehicle is turned on.
Q: What effect will it have on gas mileage?
A: Many users see no change in fuel economy, and some even see improvements. Frequent switching between V8 and V4 modes creates hesitation and hurts city fuel mileage, which this device resolves. Highway fuel consumption may rise slightly, but the difference is minimal.
Q: Does this device reprogram the ECU?
A: No. The device only sends communication signals to the ECU and does not alter factory programming.
Q: Can I pass emissions testing with this installed?
A: The device itself does not affect emissions results. However, emissions tests include an OBD check, so we recommend removing it before testing.
Q: Can this device fix my already failed or collapsed lifter?
A: No. A collapsed lifter is a mechanical failure that requires replacement. This device only prevents lifter damage and cannot repair existing issues.
Q: Will it interfere with the MyChevrolet APP?
A: No, the device works perfectly with the APP.
Q: Does the product come with a warranty?
A: The Mataunion AFM/DFM Disabler is backed by a lifetime warranty.
Q: Does it add horsepower?
A: Disabling AFM/DFM will not increase horsepower, but it unlocks full engine power on demand. The factory setup causes hesitation when switching from V4 back to V8 under hard acceleration. This device eliminates that hesitation, yet it does not add horsepower.
Q: How can I confirm the device is working?
A: Flashing green LED means the unit is active. Pre-2019 AFM vehicles have dashboard indicators showing V8 / V4 status for verification. 2019+ DFM models do not have this indicator (DFM supports V3, V4, V5 and other cylinder modes), so you can only confirm operation via the green light. Contact us if the LED malfunctions.
Install Instructions
Plug-and-Play Installation
Step 1: Locate the OBDII port and plug in the Mataunion AFM/DFM Disabler. You may install it whether the vehicle is on or off. When inserting with the vehicle off, the power light turns on. When inserting with the vehicle ignition on, the status LED will start blinking.
Step 2: A blinking green LED indicates the device has established proper communication with the vehicle, and you are ready to drive!
Our device features ultra-low power draw. It can remain plugged in for weeks without draining your battery. However, we recommend unplugging it if you will not drive the vehicle for an extended period.