If you own a GM V8 and you’re here, you already know the problem. Active Fuel Management (AFM) and Dynamic Fuel Management (DFM) were designed to improve fuel economy by shutting down cylinders under light load. On paper, it’s smart engineering. In real life, it often feels like a drivability compromise: uneven throttle response, strange shift behavior, inconsistent engine feel, and long-term mechanical anxiety for owners who plan to keep their trucks and SUVs past warranty.
Stop The GM “Shudder” Before It Costs You a New Engine
The 10-second fix to keep your V8 in 8-cylinder mode 100% of the time.
⚠️ Is your Silverado or Sierra doing this?
- The “Hesitation”: You hit the gas, but the truck “thinks” for a second before moving.
- The “Vibration”: A strange shudder when cruising between 30–60 MPH.
- The “Drone”: Your V8 sounds like a weed-wacker when it drops to V4 mode.
If you answered “Yes” to any of the above, your Active Fuel Management (AFM) or Dynamic Fuel Management (DFM) is working against you. While GM designed these systems to save a fraction of a gallon of gas, they created a massive mechanical liability: Lifter Failure.
Ranked #1 Best Seller in Engine Management Systems
The $5,000 Gamble
When your engine drops to 4-cylinder mode, specific lifters are physically collapsed using oil pressure. This constant “switching” is the #1 cause of catastrophic engine failure in late-model GM trucks.
The Financial Reality:| Range Technology Disabler | ~$200 |
| Single Bank Lifter Replacement | $2,800 – $3,500 |
| Total Engine Replacement (L83/L86) | $7,500 – $10,000 |
Installing a Range Technology AFM Disabler is essentially an insurance policy for your powertrain.
Why Range Technology? (Accept No Substitutes)
In the world of OBD-II modules, you get what you pay for. Cheap “no-name” clones are notorious for draining batteries or throwing “StabiliTrak” error codes.
Zero Battery Drain: Range’s patented “Sleep Mode” ensures your truck starts every morning. Invisible to Dealers: Does not re-flash your computer. Unplug it before service, and no trace is left behind. Full Power, All The Time: Instantly restores that “V8 feel.” Your transmission will stop hunting for gears, and your throttle will feel connected to the road again.“It’s like a different truck.”
“I was skeptical about spending $200 on a little plug, but the difference in my 2021 Silverado was immediate. No more hesitation, no more weird shuddering, and the gas mileage difference was less than 1 MPG. If you love your truck, buy this.”
— Michael R., Verified Owner
The 10-Second Install
No tools. No mechanical skills. No software to download.
1. Plug In
Insert into the OBD-II port under your dash.
2. Start Engine
The device lights up and begins communicating.
3. Drive
Enjoy full V8 power instantly. That’s it.
Free Shipping & Easy Returns via Amazon
Frequently Asked Questions
Q: Will this void my warranty? A: No. Because it doesn’t “write” to your vehicle’s ECU, it is physically impossible for a dealer to see it once it’s unplugged. It is 100% reversible.
Q: Will my MPG drop significantly? A: Most owners report a loss of only 1 MPG. In exchange, you get a smoother ride and an engine that can last 200,000+ miles.
Q: Does it work with the 10-speed transmission? A: Yes. Range offers specific models for the newer DFM (Dynamic Fuel Management) systems found in 2019–2026 trucks.
Final Verdict: The Cheapest Modification You’ll Ever Make
Don’t wait for a lifter to fail and leave you stranded on the side of the road. Restore your truck’s drivability and protect your investment today.
Get your Range Technology Disabler from the Official Amazon Store here.
