Stops cylinder deactivation on GM V8 & V6 engines — before it costs you a $5,000 repair.
Built for one job: keeping your truck out of V4 mode.
GM's Active Fuel Management (AFM) and the newer Dynamic Fuel Management (DFM) shut off half your cylinders thousands of times per drive to chase a small EPA fuel-economy number. That constant cycling is what wears out the lifters and grinds grooves into the camshaft — the failure that costs $3,000 to $12,000 to repair.
Vulcan™ plugs into your OBD-II port and continuously tells the ECM to stay in full-cylinder mode. The deactivation never happens. The lifters never collapse. The failure pathway is removed.
Honest note: Vulcan™ is preventative. It removes the #1 cause of AFM/DFM lifter failure going forward. It cannot reverse damage that's already there. Best installed on a healthy engine — before the tick starts.
Want to remove it? Pull it out. Factory behavior returns instantly. No codes, no flash, no trace.
Questions? support@vulcan.com
Install Vulcan™. Drive your truck. If it doesn't feel smoother, more consistent, and more confident — email us within 60 days and we'll refund every dollar. No questions, no hassle, no restocking fees.
“I install one of these on every GM I work on. The AFM cycling is the #1 cause of lifter failure I see — this stops it.”
— Jason K. · Independent Mechanic, 11 years
Compatible with 80+ GM models across Chevrolet, GMC, Cadillac, Buick, Pontiac, Holden, and more. Find yours below — or message us with your year and model and we'll confirm in minutes.
| Model | Engine | Years |
|---|---|---|
| Avalanche | 5.3L V8 | 2007–2013 |
| Avalanche | 6.0L V8 | 2007–2009 |
| Avalanche | 6.2L V8 | 2010–2013 |
| Blazer | 3.6L V6 | 2019–2022 |
| Camaro | 3.6L V6 | 2016–2024 |
| Camaro | 6.2L V8 | 2010–2024 |
| Caprice PPV | 6.0L V8 | 2011–2017 |
| Colorado | 3.6L V6 | 2015–2020 |
| Corvette | 6.2L V8 | 2014–2019 |
| Equinox Sport | 3.6L V6 | 2008–2009 |
| Express 1500 | 5.3L V8 | 2014 |
| Impala | 3.9L V6 | 2007–2009 |
| Impala | 5.3L V8 | 2006–2009 |
| Malibu | 3.6L V6 | 2008–2012 |
| Malibu | 3.9L V6 | 2006–2009 |
| Malibu Maxx | 3.9L V6 | 2006 |
| Monte Carlo | 5.3L V8 | 2006–2007 |
| Silverado 1500 | 4.3L V6 | 2014–2021 |
| Silverado 1500 | 5.3L V8 | 2007–2022 |
| Silverado 1500 | 6.0L V8 | 2007–2013 |
| Silverado 1500 | 6.2L V8 | 2014–2022 |
| Silverado 1500 LD | 5.3L V8 | 2019 |
| SS | 6.2L V8 | 2014–2017 |
| Suburban | 5.3L V8 | 2014–2020 |
| Suburban | 6.2L V8 | 2019–2020 |
| Suburban 1500 | 5.3L V8 | 2007–2014 |
| Suburban 1500 | 6.0L V8 | 2007–2013 |
| Suburban 2500 | 6.0L V8 | 2007–2013 |
| Tahoe | 5.3L V8 | 2007–2020 |
| Tahoe | 6.0L V8 | 2007–2014 |
| Tahoe | 6.2L V8 | 2015–2020 |
| Trailblazer | 5.3L V8 | 2005–2009 |
| Traverse | 3.6L V6 | 2018 |
| Uplander | 3.9L V6 | 2006–2009 |
| Model | Engine | Years |
|---|---|---|
| Acadia | 3.6L V6 | 2007–2008 |
| Canyon | 3.6L V6 | 2015–2020 |
| Envoy | 5.3L V8 | 2005–2009 |
| Sierra 1500 | 4.3L V6 | 2014–2018 |
| Sierra 1500 | 5.3L V8 | 2007–2022 |
| Sierra 1500 | 6.0L V8 | 2007–2013 |
| Sierra 1500 | 6.2L V8 | 2014–2022 |
| Sierra Denali | 6.2L V8 | 2010–2018 |
| Sierra / Denali | 6.2L V8 | 2014–2018 |
| Yukon | 5.3L V8 | 2007–2020 |
| Yukon | 6.0L V8 | 2007–2014 |
| Yukon | 6.2L V8 | 2010–2020 |
| Yukon Denali | 6.0L V8 | 2007–2018 |
| Yukon Denali | 6.2L V8 | 2007–2018 |
| Yukon Denali XL | 6.0L V8 | 2007–2018 |
| Yukon Denali XL | 6.2L V8 | 2010–2018 |
| Yukon XL | 5.3L V8 | 2015–2020 |
| Yukon XL | 6.0L V8 | 2007–2014 |
| Yukon XL | 6.2L V8 | 2010–2018 |
| Model | Engine | Years |
|---|---|---|
| ATS | 3.6L V6 | 2013–2019 |
| CT6 | 3.6L V6 | 2016–2018 |
| CT6 (Non-Hybrid) | 3.0L V6 | 2016–2018 |
| CTS | 3.6L V6 | 2004–2019 |
| CTS | 6.0L V8 | 2006–2007 |
| CTS | 6.2L V8 | 2009–2019 |
| Escalade | 5.3L V8 | 2010–2018 |
| Escalade | 6.0L V8 | 2010–2018 |
| Escalade | 6.2L V8 | 2010–2018 |
| Escalade / ESV | 6.0/6.2L V8 | 2010–2020 |
| Escalade ESV | 5.3L V8 | 2010–2018 |
| Escalade ESV | 6.0L V8 | 2010–2018 |
| Escalade ESV | 6.2L V8 | 2010–2013 |
| Escalade EXT | 6.0L V8 | 2010–2018 |
| Escalade EXT | 6.2L V8 | 2010–2013 |
| SRX | 3.6L V6 | 2004–2009 |
| STS | 3.6L V6 | 2005–2007 |
| XT5 | 3.6L V6 | 2017–2019 |
| XTS | 3.6L V6 | 2013–2019 |
| Model | Engine | Years |
|---|---|---|
| Enclave | 3.6L V6 | 2008–2020 |
| Envision | 2.5L L4 | 2017–2018 |
| LaCrosse | 3.6L V6 | 2005–2019 |
| LaCrosse | 5.3L V8 | 2008–2009 |
| LaCrosse CSX | 3.6L V6 | 2005–2008 |
| Rainier | 5.3L V8 | 2005–2007 |
| Regal GS | 3.6L V6 | 2018 |
| Rendezvous | 3.5/3.6L V6 | 2006–2007 |
| Rendezvous CXL/Ultra | 3.6L V6 | 2004–2007 |
| Terraza | 3.9L V6 | 2006–2007 |
| Model | Engine | Years |
|---|---|---|
| G6 | 3.6L V6 | 2008–2009 |
| G6 | 3.9L V6 | 2007 |
| G6 GTP | 3.6L V6 | 2007 |
| G6 GXP | 3.6L V6 | 2008–2009 |
| G8 | 3.6L V6 | 2008–2009 |
| G8 | 6.0L V8 | 2008–2009 |
| G8 GT | 6.0L V8 | 2009–2010 |
| G8 GT | 6.2L V8 | 2010 |
| Grand Prix | 3.8L V6 | 2007 |
| Grand Prix | 5.3L V8 | 2005–2008 |
| Montana | 3.9L V6 | 2006–2009 |
| Montana SV6 | 3.9L V6 | 2006–2008 |
| Torrent | 3.6L V6 | 2008–2009 |
| Torrent GXP | 3.9L V6 | 2008–2009 |
| Model | Engine | Years |
|---|---|---|
| VZ Calais SV6 | 3.6L V6 | 2006–2018 |
| VZ Calais SV6 | 6.2L V8 | 2006–2018 |
| Commodore Wagon | 3.6L V6 | 2006–2018 |
| Commodore Wagon | 6.2L V8 | 2006–2018 |
| VZ Commodore Sedan | 3.6L V6 | 2006–2018 |
| VZ Commodore Sedan | 6.2L V8 | 2015–2018 |
| Crewman / UTE | 3.6L V6 | 2006–2018 |
| Crewman / UTE | 6.0L V8 | 2015–2018 |
| 9C1 Police Special | 6.0L V8 | 2015–2018 |
| Rodeo | 3.6L V6 | 2006–2011 |
| Colorado | 3.6L V6 | 2006–2009 |
| VE Commodore Omega | 3.6L V6 | 2006–2009 |
| WL Statesman | 3.6L V6 | 2006–2017 |
| WM Statesman / Caprice | 3.6L V6 | 2006–2017 |
| WM Statesman / Caprice | 6.0L V8 | 2006–2017 |
| Model | Engine | Years |
|---|---|---|
| Saab Outlook XE | 3.6L V6 | 2007–2008 |
| Saab Relay | 3.9L V6 | 2006–2008 |
| Saab 9-7X | 5.3L V8 | 2005–2009 |
| Saturn Aura XR | 3.6L V6 | 2007–2009 |
| Saturn Outlook XR | 3.6L V6 | 2007–2008 |
| Saturn VUE XR / Red Line | 3.9L V6 | 2008–2009 |
| Isuzu Aura XR | 3.6L V6 | 2007–2009 |
| Isuzu Ascender | 5.3L V8 | 2005–2009 |
| Suzuki XL7 | 3.6L V6 | 2007–2009 |
Can't find your vehicle? Reach out with your year and model and we'll confirm compatibility within one business day.
One collapsed lifter can cost between $3,000 and $12,000 — and most owners never hear a warning.
AFM and DFM collapse special hydraulic lifters thousands of times per drive. Sooner or later one sticks. When it sticks, it grinds a groove into your camshaft, and the damage spreads through the oiling system. The first thing many owners hear is the tick. By then, the cam is already chewed.
Vulcan™ keeps every cylinder firing 24/7. The collapse command never gets sent. The lifters never cycle. The single biggest cause of these repairs — gone.
No more shudder. No more hesitation. No more hunting for gears. The moment you press the pedal, your truck responds the way it's supposed to — smooth, full, immediate V8 power. No drop to V4. No delayed re-engagement. No drone on the highway.
See what GM truck owners are saying.
Wish I had done this sooner. My truck stopped bouncing between gears and RPM. With this and E85, it actually feels good to drive again. 100% recommend.
Vulcan™ AFM/DFM Disabler
$99.99 $149.99
📅 Purchased on May 5th, 2026
No issues, no codes. Does what it's supposed to. Easy to install and take off if needed. Throttle feels a bit better and mileage didn't change. Worth it.
Vulcan™ AFM/DFM Disabler
$99.99 $149.99
📅 Purchased on April 29th, 2026
Glad I picked it up. No problems so far. Used to get in and mess with settings, now I just get in and drive.
Vulcan™ AFM/DFM Disabler
$99.99 $149.99
📅 Purchased on April 8th, 2026
Truck feels stronger, shifts smoother, and no hesitation when towing. Been running it for a while with no issues.
Vulcan™ AFM/DFM Disabler
$99.99 $149.99
📅 Purchased on March 21st, 2026
After dealing with lifter issues around 100k miles, I didn't want to risk it again. Put this on my 2015 Silverado and it's been running smoother since.
Vulcan™ AFM/DFM Disabler
$99.99 $149.99
📅 Purchased on February 3rd, 2026
Having power ready all the time makes it feel less laggy. The truck responds quicker now, and the exhaust drone isn't there anymore.
Vulcan™ AFM/DFM Disabler
$99.99 $149.99
📅 Purchased on January 12th, 2026
Try Vulcan™ for 60 days. If it doesn't feel right, you don't pay.
Install it on your truck and drive. If it doesn't deliver smoother, more consistent, more confident performance, email support@vulcan.com within 60 days and we'll refund every penny. No questions. No restocking fees. No hassle.
GET YOURS NOWVulcan™ doesn't flash, reprogram, or modify your ECU in any way. It simply tells the controller to stay in full-cylinder mode. Pop it out before any dealer visit and there's no trace it was ever there. (Federal Magnuson-Moss law also protects you from blanket dealer warranty-voids, but the cleanest move is just to unplug it.)
About 10 seconds. Find the OBD-II port under your dash on the driver's side, push the device in until it clicks, and start your truck. The 4 LEDs come on — that's it. No tools, no tune.
Some owners notice a 1–2 MPG drop on the highway when AFM would normally save fuel; others see no real-world change because they were already in V8 mode most of the time. Most owners trade those few highway MPG for protection against a five-figure lifter job. This product is for reliability and drivability — not fuel savings.
Yes — designed for both AFM (older 5.3L / 6.0L / 6.2L V8s and the 4.3L V6) and the newer DFM. Confirm your year, engine and transmission in the fitment table above, or message us.
No. Vulcan™ communicates with your ECM in a way that doesn't throw codes. If you ever see one, unplug the device — the code clears and the truck reverts to factory immediately.
No. Power draw is under 1 milliamp (about 0.71 mA typical). A healthy battery can sit for weeks with Vulcan™ in place.
Cylinder deactivation is a fuel-economy feature, not an emissions device — but we still recommend unplugging Vulcan™ 50–100 miles before your inspection so all OBD readiness monitors complete, then plug it back in after you pass. (We don't market this for use in California / CARB-restricted states.)
Every order is backed by our 60-day money-back guarantee. Email support@vulcan.com and we'll handle the return — no questions asked.
