OBD2 Plug-In AFM/DFM Delete Module
The Smarter Way to
Protect Your Engine
Couldn't load pickup availability
90-day money-back guarantee
Stop Lifter Failure
Before It Costs You $4,000
The plug-in module that disables GM's cylinder deactivation the moment you start your truck — no tools, no mechanic, no ECU programming.
AFM/DFM Is Destroying GM Engines
GM's cylinder deactivation tech saves a tiny bit of fuel — but it's directly linked to one of the most expensive failures in truck history.
Lifter & Camshaft Failure
Repeated AFM/DFM activation causes excessive wear on your lifters and camshaft. Average repair cost: $3,000–$6,000.
The V4 "Shudder"
That rough vibration at highway speeds? That's your engine dropping cylinders. It's not supposed to feel smooth doing it — and yours is wearing out every time.
GM Knows. The Fix Is Real.
Dealers charge $100+ just to run a tune disabling AFM. The CylinderGuard does the same thing for a fraction of the cost — and you can remove it anytime.
One Module. Full Protection.
Stops AFM/DFM Before It Causes Damage
CylinderGuard disables cylinder deactivation the moment your truck starts — keeping all cylinders firing on every drive, every time.
Restores True V8 Power Delivery
No more shudder. Smoother throttle response, stronger acceleration, and the performance your engine was designed to deliver.
Zero Tools. Zero Mechanic. 2 Minutes.
Find your OBD2 port under the dash, plug it in, start your truck. That's it. No wiring, no programming, no modifications.
No Check Engine Light. No Trace.
Unlike a tune or flash, CylinderGuard works passively through the OBD2 port without writing to your ECU. Remove it anytime — your truck stays completely stock.
Installed in Under 2 Minutes
Find Your OBD2 Port
Usually under the driver's side dash. Every GM truck has one — no exceptions.
Plug In CylinderGuard
Click it in. No tools, no wiring, no mechanic. It fits flush and stays put.
Start Your Truck
AFM/DFM is immediately disabled. Your engine runs on all cylinders, every drive.
Real Results from Verified Owners
reported noticeably smoother throttle response and eliminated the V4 "shudder" after installing the module
said installation took under 2 minutes and required zero mechanical experience or tools
felt more confident about their engine's long-term health after disabling AFM/DFM cylinder deactivation
said they would recommend CylinderGuard to other GM truck and SUV owners dealing with AFM/DFM concerns
What Real Owners Are Saying
Dropped $4,800 on a lifter job last year. My buddy told me about CylinderGuard after. Installed it in 90 seconds, truck runs smooth as it did when I bought it. Wish I had this years ago. Worth every penny and then some.
✓ Verified PurchaseI was skeptical a $60 plug could do what a $500 tune does. It does. No shudder, no V4 switching, no CEL. I tested it — unplugged it for a day and the shudder came back immediately. This thing works.
✓ Verified PurchaseThat should tell you how easy it is. No exaggeration. Plugged in, truck started, done. Customer service answered my pre-sale question in under an hour too. Five stars all the way.
✓ Verified PurchaseMade for GM Trucks & SUVs
Compatible with V6 and V8 GM engines including 4.3L, 5.3L, 6.0L, and 6.2L across model years 2007–2022.
Not sure if your truck is compatible? Email us your year/make/model and we'll confirm within 1 hour — or your order ships with a 100% compatibility guarantee.
75-Day Money-Back Guarantee
If CylinderGuard doesn't work on your vehicle — for any reason — return it for a full refund. No questions, no hassle, no restocking fee. We stand behind every unit.
Everything You Want to Know
Don't Wait for a $5,000 Repair Bill.
Protect your engine today for the cost of a single oil change.
🛡️ Claim My CylinderGuard →