Description
Product Overview
The RA003 AFM/DFM Disabler is a plug-and-play OBD-II module that instantly deactivates Active Fuel Management (AFM) and Dynamic Fuel Management (DFM) on compatible GM V6 and V8 gasoline engines. Simply plug it into your OBD-II port and your engine runs in full V8 (or V6) mode at all times — no ECU tuning, no wiring, no permanent changes. Remove it to restore factory settings instantly.
Key Features
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True Plug & Play — No tools, no programming, no permanent modifications. Plugs into the OBD-II diagnostic port in seconds. Unplug to revert to factory AFM/DFM behavior.
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Eliminates AFM/DFM Lag — Prevents the hesitation and shudder caused by cylinder deactivation switching between V4 and V8/V6 modes. Smoother throttle response at all speeds.
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Reduces Oil Consumption — AFM-equipped engines are known for excessive oil consumption due to cylinder deactivation. Running in full-cylinder mode helps mitigate this issue.
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Preserves Factory ECU — Does NOT flash, reprogram, or modify your vehicle's computer. 100% reversible — just unplug it.
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Compact & Discreet — Low-profile design fits snugly in your OBD-II port without interfering with driving.
Compatibility
This AFM/DFM disabler is compatible with 2004–2020 GM vehicles equipped with Active Fuel Management (AFM) or Dynamic Fuel Management (DFM) on the following engines:
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3.6L V6 (LFX, LGX) — Cadillac ATS, CTS, CT6; Chevy Colorado, Camaro, Equinox, Impala, Malibu; GMC Acadia, Canyon; Buick LaCrosse, Enclave, Regal
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5.3L V8 (LH6, LC9, LMG, L83, L84) — Chevy Silverado 1500, Tahoe, Suburban, Avalanche; GMC Sierra 1500, Yukon; Buick Rainier; Saab 9-7X
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6.0L V8 (L76, L77, L96) — Chevy Caprice PPV, SS; Pontiac G8 GXP
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6.2L V8 (L99, L86, LT1) — Chevy Camaro SS, Corvette; Cadillac Escalade, CTS-V
⚠️ IMPORTANT: Not compatible with 2019+ 10-speed automatic transmission models equipped with the 5.3L or 6.2L engine. Please verify your transmission type before ordering.
Full Vehicle Fitment List
| Make |
Model |
Engine |
Years |
| Buick |
Enclave |
3.6L V6 |
2008 |
| Buick |
LaCrosse |
3.6L V6 |
2005–2018 |
| Buick |
Rainier |
5.3L V8 |
2005–2009 |
| Buick |
Regal GS |
3.6L V6 |
2018 |
| Buick |
Rendezvous |
3.9L V6 |
2006–2007 |
| Buick |
Terraza |
3.9L V6 |
2006–2008 |
| Cadillac |
ATS |
3.6L V6 |
2012–2019 |
| Cadillac |
CT6 |
3.6L V6 |
2016–2018 |
| Cadillac |
CTS |
6.2L V8 |
2004–2019 |
| Cadillac |
Escalade |
6.2L V8 |
2010–2018 |
| Cadillac |
Escalade ESV |
6.2L V8 |
2010–2018 |
| Cadillac |
SRX |
3.6L V6 |
2004–2009 |
| Chevy |
Avalanche |
5.3L V8 |
2007–2013 |
| Chevy |
Camaro |
6.2L V8 |
2011–2020 |
| Chevy |
Caprice PPV |
6.0L V8 |
2011–2018 |
| Chevy |
Colorado |
3.6L V6 |
2015–2020 |
| Chevy |
Corvette |
6.2L V8 |
2012–2018 |
| Chevy |
Equinox Sport |
3.6L V6 |
2008–2009 |
| Chevy |
Impala |
5.3L V8 |
2006–2009 |
| Chevy |
Malibu |
3.6L V6 |
2008–2012 |
| Chevy |
Monte Carlo |
5.3L V8 |
2006–2008 |
| Chevy |
Silverado 1500 |
5.3L V8 |
2007–2020 |
| Chevy |
SS |
6.2L V8 |
2014–2018 |
| Chevy |
Suburban |
5.3L V8 |
2007–2020 |
| Chevy |
Tahoe |
5.3L V8 |
2007–2020 |
| GMC |
Acadia |
3.6L V6 |
2007–2008 |
| GMC |
Canyon |
3.6L V6 |
2015–2020 |
| GMC |
Envoy |
5.3L V8 |
2005–2009 |
| GMC |
Sierra 1500 |
5.3L V8 |
2010–2020 |
| GMC |
Yukon |
5.3L V8 |
2007–2018 |
| GMC |
Yukon XL |
5.3L V8 |
2010–2018 |
| GMC |
Yukon Denali XL |
6.2L V8 |
2010–2018 |
| Pontiac |
G8 |
3.6L V6 |
2008–2009 |
| Pontiac |
Grand Prix |
5.3L V8 |
2005–2008 |
| Saab |
9-7X |
5.3L V8 |
2005–2009 |
| Saturn |
Outlook XE |
3.6L V6 |
2007–2008 |
| Suzuki |
XL7 |
3.6L V6 |
2007–2009 |
| Holden |
VE Commodore |
3.6L V6 |
2006–2009 |
Why Choose This AFM/DFM Disabler?
AFM and DFM systems save fuel on paper, but in the real world they cause hesitation, vibration, and premature engine wear. GM's own technical service bulletins acknowledge oil consumption and lifter failure issues linked to cylinder deactivation. This RA003 disabler keeps your engine running in full-cylinder mode — the way it was designed to run — without voiding your warranty or permanently modifying anything. If you need to pass emissions or visit the dealer, just unplug it.
FAQ
Q: Will this trigger a check engine light (CEL)?
No. The RA003 disabler communicates with the ECU via the OBD-II protocol to keep AFM/DFM inactive without triggering diagnostic trouble codes. Your dashboard stays clean.
Q: Is this compatible with 2019+ 10-speed models?
No. This disabler is NOT compatible with 2019+ GM trucks and SUVs equipped with the 10-speed automatic transmission (5.3L L84 and 6.2L L87). Compatible with 6-speed and 8-speed models only. Please verify your transmission before ordering.
Q: Can I leave it plugged in all the time?
Yes, the RA003 is designed for continuous use. However, we recommend unplugging it if the vehicle will sit unused for more than 30 days to prevent any parasitic battery drain.
Q: Will this void my warranty?
No. Because it does not reprogram or flash the ECU, it leaves no trace when removed. Unplug before dealer visits and your vehicle is 100% factory stock. However, Magnuson-Moss Warranty Act protections apply — a dealer cannot void your warranty for using a plug-in accessory unless they can prove it caused a specific failure.
Q: Does this improve fuel economy?
AFM/DFM is designed to save fuel by deactivating cylinders. Disabling it may result in a small MPG decrease (typically 1–2 MPG) in highway cruising. However, many owners report negligible real-world difference since AFM rarely activates in city driving. The trade-off is smoother performance, reduced oil consumption, and potentially longer engine life.
Q: How do I install it?
Simply locate your vehicle's OBD-II diagnostic port (usually under the dashboard, driver's side), and plug the RA003 in firmly until it clicks. The LED will illuminate to confirm connection. Start your engine — AFM/DFM is now disabled. No tools, no programming, no waiting.
Q: Does this work on diesel engines?
No. This disabler is for GM gasoline V6 and V8 engines with AFM/DFM only. It does NOT work on Duramax diesel, EcoTec diesel, or any non-GM vehicles.
Q: What's the difference between AFM and DFM?
AFM (Active Fuel Management) deactivates half the cylinders in fixed patterns — for example, a V8 runs on 4 cylinders. DFM (Dynamic Fuel Management, introduced 2019) can deactivate any number of cylinders in 17 different patterns for finer control. The RA003 disables both systems.
