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9 years at a Chevrolet dealership taught me one thing. The most expensive truck in the showroom and the most profitable job in the service bay are connected in a way GM never wants you to figure out. I spent 9 years writing service tickets at a Chevrolet dealership. I left two years ago. And there are things I watched from behind that service desk that I think people driving these trucks have a right to know. Someone reached out to me through a mutual contact last week. Guy in his mid-fifties. 2020 Silverado High Country. 66,000 miles. Engine destroyed. Shop quoted him $7,400. He asked me one question. "Should the dealer have told me something?" Yes. But they didn't. And they weren't going to. Let me explain what I mean. In 9 years on the service side of a Chevy dealership, I logged every kind of repair that comes through. Transmissions, timing chains, brake jobs, electrical. Everything. The most consistent engine failure I saw — year after year, across the 5.3 and the 6.2 — was lifter failure tied to a system called Active Fuel Management. AFM. GM started building it into their V8 engines in 2007. Under light load, the computer shuts off four of the eight cylinders. Saves fuel. A mile or two per gallon in ideal conditions. Inside the lifters that run this system is a tiny locking pin. Every time the engine switches between V8 and V4 mode, those pins engage and release. That happens hundreds of times per drive, every drive. Until the pin fails. The lifter collapses. And the camshaft gets destroyed. I watched customers bring in trucks with full synthetic oil changes every 3,000 miles. Service records going back to day one. Everything by the book. Didn't matter. Lifter jobs were steady, steady work. Some months we had three or four of these on the lift simultaneously. The techs could diagnose it from the sound in the parking lot. 12 to 14 hours of flat-rate labor. VLOM replacement. All the AFM lifters. Camshaft if the damage spread. Four to eight thousand dollars by the time it was done. Every single one of those customers said the same thing. "Why didn't anyone tell me this could happen?" Here's what I can tell you from the inside of that operation. Everybody on the service side knew. The techs knew. The service manager knew. Lifter failures on AFM trucks were a line item in the weekly schedule. But it was never brought up at point of sale. It wasn't in any of the paperwork you signed. It wasn't in any conversation a salesman had with you when you financed that $55,000 truck. That's not an accident. That's just how dealerships work. The day I stopped writing service tickets, I started telling every GM truck owner I knew about a FullForce™ AFM disabler. It plugs into the OBD2 port under the dash. No tools. No setup. The module tells the ECU to keep all eight cylinders firing all the time. The engine never drops into V4 mode. The locking pins never cycle. The lifters don't get hammered. No ECU reflash. No permanent changes. Unplug it before your dealer visit and the system reads factory stock. Nothing to find. I've had former customers call me after installing one. Smoother idle. The highway shudder gone. The truck running like a proper V8 should. I can't change what happened at the dealerships I worked in. I logged too many of those repair orders to pretend I could. But I'm not behind a service desk anymore. I don't owe that shop anything. If you drive a 2007 or newer GM V6 or V8 truck or SUV, this system is in your engine. Your salesman didn't mention it. Your service advisor might have known about it and said nothing. The shudder you feel at 40 or 50 miles per hour is AFM cycling. And every time it does, it's working on a failure that's going to cost you thousands. The dealer isn't going to bring this up. So I am. 🚨 EDIT: The module I recommend to every GM truck owner I talk to is the FullForce™ AFM disabler. Here's the link: 👉 https://www.tryfullforce.com/products/fullforce%E2%84%A2-afm-dfm-disabler They have a 60-day guarantee. I've never heard of anyone sending one back.