ProJellico™ AFM/DFM Disabler
ProJellico™ AFM/DFM Disabler
10-second plug & play — no tools, no tuning, no teardown
Stops the V8→V4 collapse cycling that wears out AFM/DFM lifters
Zero ECU flashing or footprint — unplug anytime, back to full stock
Full-time V8 mode — shudder-free, linear throttle, every drive
Passive architecture: no battery drain, never masks trouble codes
Fits GM 5.3L and 6.2L V8s (and AFM V6s), 2007–2021 — check your fitment below
Couldn't load pickup availability
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Zero codes, no battery drain, and plugs right in. My 5.3 pulls like a real V8 now. Worth every penny. -
That annoying 45mph highway shudder is completely gone. Shifts smoother and no more constant hunting for gears.
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Bought it to protect my lifters. No software to flash, no settings to mess with. Just plug it in and drive.
Will it fit my truck?
Will it fit my truck?
Fits GM 5.3L and 6.2L V8s (plus AFM-equipped V6s) from 2007–2021 — Silverado, Sierra, Tahoe, Yukon, Suburban, Escalade, and more. Not sure?
Use the fitment checker just below this section:
select your make, model, and year and get an instant answer. Note: 2022.5+ DFM trucks aren't supported yet — the checker will tell you straight and offer the waitlist.
What does it actually do?
What does it actually do?
Your ECU constantly commands your lifters to collapse and relock as it switches between V8 and V4 — thousands of times per tank. That transition is what wears out lock pins and kills these lifters. ProJellico plugs into your OBD2 port and stops the ECU from ever sending that command. Full V8 mode, every drive. See the full mechanism diagram further down the page.
What it doesn't do (read before buying)
What it doesn't do (read before buying)
It doesn't change the parts inside your engine, it can't heal a lifter that's already failing, and nobody honest sells engine guarantees. What it does: stops the specific event that breaks these lifters from ever running again. Full plain-type version below on this page.
Warranty, ECU & battery questions
Warranty, ECU & battery questions
Nothing is flashed or reprogrammed — the device works only while plugged in, and once removed there's nothing to find. Unplug before dealer visits if you prefer (two seconds, truck reverts to stock). Passive architecture means no battery drain while parked and it never blocks a check-engine light or trouble code.
Try it for 60 days, risk-free
Try it for 60 days, risk-free
Plug it in, feel the shudder disappear at cruising speed, drive on it for two months. Not convinced? Email us, a human refunds you, no restocking fee, no interrogation. Unplugging IS the uninstall.
— Fitment Check
Will It Fit My Vehicle?
Select your make, model, and year — we'll check it against our full compatibility list instantly.
It's not luck. It's a command.
Your ECU constantly switches the engine between V8 and V4 by collapsing and relocking a spring-loaded pin inside each lifter — thousands of times per tank, and that pin is exactly what fails. No oil change or gentle driving touches it, because it's a software command, not a wear-and-tear problem. ProJellico plugs into your OBD2 port and stops the ECU from ever ordering the collapse — lifters stay locked, the engine stays a V8, the wear event stops occurring.
Owner Impressions
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2015 Chevy Silverado 1500 5.3L
My brother's Silverado dropped a lifter at 82k miles and swallowed a $6,500 repair bill. I chose ProJellico because these guys are actually honest—they don't promise a 'miracle cure' if your hardware is already dying, they just stop the computer command that fatigues the pins. Zero battery drain after sitting in my garage for a week. It's basic risk management.
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Every time I pulled our camper, the constant cylinder switching made the transmission hunt for gears and create this annoying rumble-strip vibration at 45mph. I didn't want to flash the ECU and risk voiding my warranty with a custom tune. This little plug-in keeps it in full V8 mode perfectly. Throttle feels linear, shifts are smooth, and it leaves zero footprint when unplugged.
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I caught myself driving in dead silence for months, keeping the radio off just to listen for that dreaded cold-start lifter tick. It's an exhausting way to own a truck. Plugged the ProJellico in last November. The constant V8-to-V4 shudder on the highway vanished on the first drive. I finally turned the music back on. Best peace of mind you can buy for under a hundred bucks.
Built to a standard the clones skip.
Passive software architecture.
ProJellico communicates with the ECU without inserting itself into the vehicle's diagnostic path. It doesn't intercept, filter, or suppress anything. If your engine throws a misfire code, a sensor fault, or a check-engine light, it reaches your dash exactly as it would stock. A device you bought for peace of mind must never be the thing hiding trouble from you.
No parasitic battery drain.
The unit draws effectively nothing at rest. Park your truck for a week, a hunting season, an airport lot — it starts. The documented failure of cheap clones is constant current draw that kills batteries in days; our architecture is designed specifically against it.
Zero ECU footprint.
Nothing is flashed. Nothing is rewritten. The device works only while plugged in; remove it and your truck is factory stock, with nothing to find. That is a factual statement about how it works — not a legal promise about what any dealership will or won't do. We'd rather tell you the precise truth than print a comforting absolute.
What this device does not do.
It doesn't change the parts inside your engine — the factory lifters are still in there, and it can't heal one that's already failing. It doesn't come with an engine-life guarantee, because nobody honest sells those. What it does: stops the ECU from ever commanding the collapse-and-relock event that wears out lock pins — your lifters simply stop being asked to do the one thing that breaks them, for $89.99 and ten seconds.
4.8 out of 5 Stars
Based on 800+ verified owner reviews across public GM truck communities.
The 45mph highway shudder is entirely gone.
"Every time my Silverado switched from V8 to V4 on the highway, it felt like hitting a rumble strip. Plugged ProJellico in and the shudder vanished on the first test drive. Transmission shifts smooth now."
Finally turned the radio back on.
"I spent months driving in dead silence, listening for that dreaded lifter tick at every cold start. This device took the weight off my shoulders. Best peace of mind for under a hundred bucks."
Radical honesty from a company, love it.
"I bought this because they didn't promise a miracle cure for a dead engine. They state the physical limits plainly. My truck sits in the garage for 5-6 days at a time, zero parasitic battery drain."
Better than gambling on a $40 clone.
"A buddy of mine bought a cheap clone on Amazon and it masked a real misfire code until his cat converter melted. Spend the extra money on ProJellico. It sits completely outside the diagnostic path."
Linear throttle response at last.
"No more lag when trying to pass someone on the two-lane roads. The constant delay while the computer decided to wake up the other 4 cylinders is completely gone. Holds full V8 power."
Cheapest insurance you can buy.
"My neighbor just dropped $6,200 on a top-end rebuild after his AFM lifter collapsed. I learned from his mistake. It plugs in in ten seconds. Absolutely no software footprint when you pull it out."
Perfect for towing our 26ft camper.
"The truck used to hunt for gears constantly on slight inclines because AFM kept dropping the load into V4 mode. Now it just pulls steady like a real truck should've from the factory."
No more manually dropping into L9.
"I used to shift into L9 manually at every single stoplight just to trick the computer into staying in V8 mode. It was exhausting. This device automated the whole process for me."
Repaired back to broken? Not on my watch.
"My truck already had a full lifter repair under warranty, but the dealer just put the exact same faulty design back in. Plugged this in the day I got it back. Second set is going to live."
Zero battery drain issues.
"Left the truck parked at the airport lot for a 9-day work trip. Came back, hit the key, fired right up. The passive architecture claims are absolutely real. Don't risk your battery on cheap junk."
MPG change is practically non-existent.
"I tracked it across three full tanks of gas. I might have lost maybe 0.3 MPG on the highway, but the throttle smoothness makes it a no-brainer trade. Highly recommend."
Did not want to flash my ECU.
"I looked into custom tuning to shut off the AFM system, but I have a powertrain warranty I didn't want to blow. This is completely reversible. Unplug it in 2 seconds before dealer visits."
The truck drives like a real V8 now.
"I hated the clunky, sluggish transition every time it dropped into V4 mode cruising around town. Now the valve train is completely silent and the response is instant. Worth every penny."
Bought a second one for my dad's Tahoe.
"Ran mine for four months without a single trouble code or check engine light. Ordered another unit for my dad last week. Standard shipping was fast, took 3 days to reach Texas."
Real US support answered my question.
"I emailed them on a Sunday evening to double-check compatibility with my build date. A real human replied early Monday morning with full technical confirmation. Top-tier service."
Stopped the ticking anxiety.
"I used to flinch every single time I started the truck after it sat overnight, praying I wouldn't hear that mechanical tick. It's been 5,000 miles since plugging this in, runs completely smooth."
No tools, no software ameleliği.
"I am not a computer guy. I didn't want to mess with downloading flashing software or configuring files on a laptop. Literally pushed it into the slot under the steering column and forgot about it."
Cheaper than engine surgery.
"I looked into a full physical lifter delete kit, but the parts and labor quotes from local shops were all over $3,500. ProJellico stops the command for a fraction of that cost."
The highway rumble strip noise is gone.
"Cruising on cruise control at 65mph used to cause this horrific vibration every time the drone kicked in. The device fixed it instantly. Absolute lifesaver for long road trips."
Stands up to its claims.
"I checked my scan tool after driving with it for a week—zero masked codes, passive gateway architecture works exactly as described on the page. Dürüst mühendislik, respect."
$89.99. Ten seconds. Or the countdown keeps running.
Every mile you drive, the ECU keeps commanding the collapse cycle — thousands of times a tank, under clean oil and a light foot exactly the same. You can keep listening at cold starts, keep the emergency fund fed, keep shifting into L9 by hand. Or you can stop the command tonight, in your driveway, before your coffee gets cold.
Stop the Cycling — Get ProJellico60-day guarantee Free US shipping Unplug anytime, back to stock