{"product_id":"afm-dfm-vcm-disabler-chevrolet-silverado-1500-2007-2018-afm-dfm-disabler","title":"Chevrolet Silverado 1500 2007-2018 4.3L V6 \/ 5.3L \/ 6.0L V8 AFM\/DFM Disabler","description":"\u003cp\u003eA plug-in cylinder-deactivation disabler for the 2007–2018 Chevrolet Silverado 1500. It goes into the OBD-II diagnostic port and keeps the factory Active Fuel Management system from engaging, so the engine runs on every cylinder all the time. It does not rewrite engine software, and removal takes seconds: unplug the module and the vehicle is back to stock behavior.\u003c\/p\u003e\u003ch2\u003eFitment by year and engine\u003c\/h2\u003e\u003cp\u003eThe fitment table for this part (all rows marked 100% fitment match):\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e2007–2013 Chevrolet Silverado 1500: 5.3L V8 \/ 6.0L V8\u003c\/li\u003e\n\u003cli\u003e2014–2018 Chevrolet Silverado 1500: 4.3L V6 \/ 5.3L V8 \/ 6.0L V8\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eFor reference, these are the AFM-equipped GM engine codes that match the years and displacements above:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eLY5 (5.3L, 2007–2009, VIN 8th digit \"J\")\u003c\/li\u003e\n\u003cli\u003eLC9 (5.3L, 2007–2011, VIN 8th digit \"3\")\u003c\/li\u003e\n\u003cli\u003eLMG (5.3L, 2007–2014, VIN 8th digit \"0\")\u003c\/li\u003e\n\u003cli\u003eL76 (6.0L, 2007–2009, VIN 8th digit \"Y\")\u003c\/li\u003e\n\u003cli\u003eLFA (6.0L, 2008–2009, VIN 8th digit \"5\")\u003c\/li\u003e\n\u003cli\u003eLZ1 (6.0L, 2010–2013, VIN 8th digit \"J\")\u003c\/li\u003e\n\u003cli\u003eLV3 (4.3L, 2014–2018)\u003c\/li\u003e\n\u003cli\u003eL83 (5.3L, 2014–2018, VIN 8th digit \"C\")\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIn the same trucks and SUVs, GM also built V8s without AFM, for example the 5.3L LH9 (2010–2012 trucks, VIN code P), the 6.0L LY6 and L96 and the 6.2L L9H. Those engines never deactivate cylinders, so the module has nothing to manage on them. Check your code against both lists before you buy.\u003c\/p\u003e\u003cp\u003eAn engine code that is not listed here does not automatically rule the vehicle out, but send us the VIN first so we can check.\u003c\/p\u003e\u003ch2\u003eHow Active Fuel Management operates\u003c\/h2\u003e\u003cp\u003eOn AFM V8 engines, the computer shuts off fuel and holds the valves closed on cylinders 1, 7, 6 and 4 when the load is light, so the engine runs as a V4. It does this through special collapsible lifters on those cylinders, fed by oil-pressure solenoids. When you ask for more power, the lifters lock again and all eight cylinders fire. GM describes this behavior in its service bulletin on AFM and DFM operation.\u003c\/p\u003e\u003cp\u003eGM's 4.3L V6 (RPO LV3) uses the same idea on two cylinders: cylinders 3 and 6 are deactivated at light load, so the engine runs on four. On V8s, AFM drops cylinders 1, 7, 6 and 4. In both cases oil-pressure solenoids switch special lifters into a collapsed state and fuel to those cylinders is cut.\u003c\/p\u003e\u003cp\u003eFor the 2019 redesign of the Silverado 1500 and Sierra 1500, GM introduced Dynamic Fuel Management on the 5.3L L84 and 6.2L L87, which can run on 17 different cylinder patterns. That is a different system from the AFM covered by this listing.\u003c\/p\u003e\u003ch2\u003eThe first drive\u003c\/h2\u003e\u003cp\u003eExpect steadier behavior at part throttle and no change at wide-open throttle. Towing and hill climbing were already mostly done on all cylinders, so the biggest change is during relaxed cruising. Average fuel economy may drop slightly depending on how much of your driving is light-load highway time.\u003c\/p\u003e\u003ch2\u003eCheck the engine first\u003c\/h2\u003e\u003cp\u003eScan for stored codes before you plug it in. Misfire codes on the deactivation cylinders, an AFM solenoid circuit code, or a lifter noise are signs of an existing problem that should be repaired first. The module is meant for a healthy engine where you simply do not want cylinder deactivation.\u003c\/p\u003e\u003ch2\u003eHow this differs from an AFM delete kit\u003c\/h2\u003e\u003cp\u003eThere are three common ways to stop cylinder deactivation on GM engines: a plug-in module like this one, a custom tune that turns AFM off in the engine computer, or a mechanical delete that replaces the AFM lifters and related hardware and then needs a tune to match. The module is the only one of the three that needs no tools and no engine-computer changes, and it is the only one you can undo by unplugging it. It does not replace failed lifters; if hardware is already damaged, the repair comes first.\u003c\/p\u003e\u003ch2\u003eLiving with it\u003c\/h2\u003e\u003cp\u003eLeave it in the port for everyday driving. When the vehicle goes in for service or an emissions check, remove it so the shop has normal access to the diagnostic connector, then reinstall it.\u003c\/p\u003e\u003ch2\u003eWhy owners disable it\u003c\/h2\u003e\u003cp\u003eMany drivers would rather have predictable response than the small economy gain from running on fewer cylinders, especially when towing, hauling or driving in hills. Keeping AFM off removes the mode changes entirely. It does not add horsepower, and it is not a fix for an engine that already has lifter or oil-consumption problems.\u003c\/p\u003e\u003ch2\u003eOil and maintenance\u003c\/h2\u003e\u003cp\u003eAFM lifters and the solenoids that control them run on engine oil pressure. Keeping the oil at the right level, using the grade GM specifies on the oil filler cap or in the owner's manual, and changing it on schedule matters whether or not AFM is active. The module changes when cylinders deactivate; it does not change the oiling system.\u003c\/p\u003e\u003ch2\u003eHow to confirm your engine code\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eYour model year, model and engine match a row in the table (2007–2018 Chevrolet Silverado 1500).\u003c\/li\u003e\n\u003cli\u003eThe quickest checks are the 8th digit of your VIN, which identifies the engine, and the RPO list on the Service Parts Identification label (glovebox or trunk on most pre-2018 GM models, QR code on the driver-door pillar label from 2018).\u003c\/li\u003e\n\u003cli\u003eNo check-engine light is on, and oil level and pressure are normal.\u003c\/li\u003e\n\u003cli\u003eIf the vehicle has an engine swap, an aftermarket tune or a replacement engine computer, contact support first.\u003c\/li\u003e\n\u003cli\u003eQuestions: support@automotivebypass.com with your VIN.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eYear-by-year fitment\u003c\/h2\u003e\u003cp\u003eEach model year from the fitment data, with the AFM engine codes GM used for that year and displacement:\u003c\/p\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eYear\u003c\/th\u003e\n\u003cth\u003eMake\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eEngine\u003c\/th\u003e\n\u003cth\u003eAFM codes\u003c\/th\u003e\n\u003cth\u003eListing note\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e2007\u003c\/td\u003e\n\u003ctd\u003eChevrolet\u003c\/td\u003e\n\u003ctd\u003eSilverado 1500\u003c\/td\u003e\n\u003ctd\u003e5.3L V8 \/ 6.0L V8\u003c\/td\u003e\n\u003ctd\u003eLY5, LC9, LMG, L76\u003c\/td\u003e\n\u003ctd\u003e100% Fitment Match | OEM-Grade Quality | Plug \u0026amp; Play\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2008\u003c\/td\u003e\n\u003ctd\u003eChevrolet\u003c\/td\u003e\n\u003ctd\u003eSilverado 1500\u003c\/td\u003e\n\u003ctd\u003e5.3L V8 \/ 6.0L V8\u003c\/td\u003e\n\u003ctd\u003eLY5, LC9, LMG, L76, LFA\u003c\/td\u003e\n\u003ctd\u003e100% Fitment Match | OEM-Grade Quality | Plug \u0026amp; Play\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2009\u003c\/td\u003e\n\u003ctd\u003eChevrolet\u003c\/td\u003e\n\u003ctd\u003eSilverado 1500\u003c\/td\u003e\n\u003ctd\u003e5.3L V8 \/ 6.0L V8\u003c\/td\u003e\n\u003ctd\u003eLY5, LC9, LMG, L76, LFA\u003c\/td\u003e\n\u003ctd\u003e100% Fitment Match | OEM-Grade Quality | Plug \u0026amp; Play\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2010\u003c\/td\u003e\n\u003ctd\u003eChevrolet\u003c\/td\u003e\n\u003ctd\u003eSilverado 1500\u003c\/td\u003e\n\u003ctd\u003e5.3L V8 \/ 6.0L V8\u003c\/td\u003e\n\u003ctd\u003eLC9, LMG, LZ1\u003c\/td\u003e\n\u003ctd\u003e100% Fitment Match | OEM-Grade Quality | Plug \u0026amp; Play\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2011\u003c\/td\u003e\n\u003ctd\u003eChevrolet\u003c\/td\u003e\n\u003ctd\u003eSilverado 1500\u003c\/td\u003e\n\u003ctd\u003e5.3L V8 \/ 6.0L V8\u003c\/td\u003e\n\u003ctd\u003eLC9, LMG, LZ1\u003c\/td\u003e\n\u003ctd\u003e100% Fitment Match | OEM-Grade Quality | Plug \u0026amp; Play\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2012\u003c\/td\u003e\n\u003ctd\u003eChevrolet\u003c\/td\u003e\n\u003ctd\u003eSilverado 1500\u003c\/td\u003e\n\u003ctd\u003e5.3L V8 \/ 6.0L V8\u003c\/td\u003e\n\u003ctd\u003eLMG, LZ1\u003c\/td\u003e\n\u003ctd\u003e100% Fitment Match | OEM-Grade Quality | Plug \u0026amp; Play\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2013\u003c\/td\u003e\n\u003ctd\u003eChevrolet\u003c\/td\u003e\n\u003ctd\u003eSilverado 1500\u003c\/td\u003e\n\u003ctd\u003e5.3L V8 \/ 6.0L V8\u003c\/td\u003e\n\u003ctd\u003eLMG, LZ1\u003c\/td\u003e\n\u003ctd\u003e100% Fitment Match | OEM-Grade Quality | Plug \u0026amp; Play\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2014\u003c\/td\u003e\n\u003ctd\u003eChevrolet\u003c\/td\u003e\n\u003ctd\u003eSilverado 1500\u003c\/td\u003e\n\u003ctd\u003e4.3L V6 \/ 5.3L V8 \/ 6.0L V8\u003c\/td\u003e\n\u003ctd\u003eLV3, LMG, L83\u003c\/td\u003e\n\u003ctd\u003e100% Fitment Match | OEM-Grade Quality | Plug \u0026amp; Play\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2015\u003c\/td\u003e\n\u003ctd\u003eChevrolet\u003c\/td\u003e\n\u003ctd\u003eSilverado 1500\u003c\/td\u003e\n\u003ctd\u003e4.3L V6 \/ 5.3L V8 \/ 6.0L V8\u003c\/td\u003e\n\u003ctd\u003eLV3, L83\u003c\/td\u003e\n\u003ctd\u003e100% Fitment Match | OEM-Grade Quality | Plug \u0026amp; Play\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2016\u003c\/td\u003e\n\u003ctd\u003eChevrolet\u003c\/td\u003e\n\u003ctd\u003eSilverado 1500\u003c\/td\u003e\n\u003ctd\u003e4.3L V6 \/ 5.3L V8 \/ 6.0L V8\u003c\/td\u003e\n\u003ctd\u003eLV3, L83\u003c\/td\u003e\n\u003ctd\u003e100% Fitment Match | OEM-Grade Quality | Plug \u0026amp; Play\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2017\u003c\/td\u003e\n\u003ctd\u003eChevrolet\u003c\/td\u003e\n\u003ctd\u003eSilverado 1500\u003c\/td\u003e\n\u003ctd\u003e4.3L V6 \/ 5.3L V8 \/ 6.0L V8\u003c\/td\u003e\n\u003ctd\u003eLV3, L83\u003c\/td\u003e\n\u003ctd\u003e100% Fitment Match | OEM-Grade Quality | Plug \u0026amp; Play\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2018\u003c\/td\u003e\n\u003ctd\u003eChevrolet\u003c\/td\u003e\n\u003ctd\u003eSilverado 1500\u003c\/td\u003e\n\u003ctd\u003e4.3L V6 \/ 5.3L V8 \/ 6.0L V8\u003c\/td\u003e\n\u003ctd\u003eLV3, L83\u003c\/td\u003e\n\u003ctd\u003e100% Fitment Match | OEM-Grade Quality | Plug \u0026amp; Play\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003ePreparation\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eScan the engine for stored codes and note any misfire or AFM solenoid codes.\u003c\/li\u003e\n\u003cli\u003eCheck the oil level and confirm the grade matches GM's specification for your engine.\u003c\/li\u003e\n\u003cli\u003eSwitch the ignition off before inserting the module.\u003c\/li\u003e\n\u003cli\u003eLocate the OBD-II port under the driver-side dash.\u003c\/li\u003e\n\u003cli\u003ePush the module in until it is fully seated and sits clear of your knee and the pedals.\u003c\/li\u003e\n\u003cli\u003eStart the engine and let it idle before driving.\u003c\/li\u003e\n\u003cli\u003eTake a drive at steady light throttle, where AFM used to engage, and confirm the engine stays on all cylinders.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eThe engines behind the codes\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLY5\u003c\/strong\u003e: iron-block 5.3L Vortec used in 2007–2009 trucks and SUVs, without variable valve timing or flex-fuel capability. VIN engine digit \"J\".\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLC9\u003c\/strong\u003e: aluminum-block 5.3L flex-fuel (E85-capable) truck and SUV engine, with variable valve timing added from 2010. VIN engine digit \"3\".\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLMG\u003c\/strong\u003e: 5.3L flex-fuel truck and SUV engine, with variable valve timing from 2010. VIN engine digit \"0\".\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eL76\u003c\/strong\u003e: aluminum-block 6.0L V8 with rectangular-port heads; the 2007–2009 truck version also has variable valve timing. VIN engine digit \"Y\".\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLFA\u003c\/strong\u003e: 6.0L V8 used in the Two-Mode Hybrid trucks and SUVs, with variable valve timing. VIN engine digit \"5\".\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLZ1\u003c\/strong\u003e: 6.0L hybrid V8 for 2010–2013 Two-Mode Hybrid models, flex-fuel capable with variable valve timing. VIN engine digit \"J\".\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLV3\u003c\/strong\u003e: 4.3L EcoTec3 V6 with direct injection, the base engine in the 2014–2018 Silverado 1500 and Sierra 1500.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eL83\u003c\/strong\u003e: 5.3L EcoTec3 V8 with direct injection, variable valve timing and flex-fuel capability. VIN engine digit \"C\".\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003ePlatform and engine notes\u003c\/h2\u003e\u003cp\u003eTwo platform generations are involved here. GMT900 trucks and SUVs (from the 2007 model year) used Gen IV small-block V8s, while K2XX models (2014-on pickups, 2015-on SUVs) switched to EcoTec3 engines with direct injection. AFM appears in both, but not on every engine in either, so match the RPO code.\u003c\/p\u003e\u003ch2\u003eTroubleshooting\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eA light comes on:\u003c\/strong\u003e Pull the module, read the code, and send it with your VIN to support.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eStill dropping cylinders:\u003c\/strong\u003e Check the module is pushed fully into the port and that your engine is AFM-equipped.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eNeed the port for diagnostics:\u003c\/strong\u003e Remove the module first.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eNoise or misfire persists:\u003c\/strong\u003e Have the engine inspected; the module only stops cylinder deactivation.\u003c\/p\u003e\u003ch2\u003eEngine data at a glance\u003c\/h2\u003e\u003cp\u003eRatings and features for the engine codes that apply to this listing, as published for each engine (figures vary by vehicle and year):\u003c\/p\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eRPO code\u003c\/th\u003e\n\u003cth\u003eSize\u003c\/th\u003e\n\u003cth\u003ePower\u003c\/th\u003e\n\u003cth\u003eTorque\u003c\/th\u003e\n\u003cth\u003eCompression\u003c\/th\u003e\n\u003cth\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eLY5\u003c\/td\u003e\n\u003ctd\u003e5.3L\u003c\/td\u003e\n\u003ctd\u003e315–320 hp\u003c\/td\u003e\n\u003ctd\u003e335–340 lb-ft\u003c\/td\u003e\n\u003ctd\u003e9.95:1\u003c\/td\u003e\n\u003ctd\u003eiron block, AFM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLC9\u003c\/td\u003e\n\u003ctd\u003e5.3L\u003c\/td\u003e\n\u003ctd\u003e315–320 hp\u003c\/td\u003e\n\u003ctd\u003e335 lb-ft\u003c\/td\u003e\n\u003ctd\u003e9.60:1 or 9.95:1\u003c\/td\u003e\n\u003ctd\u003ealuminum block, AFM, E85-capable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLMG\u003c\/td\u003e\n\u003ctd\u003e5.3L\u003c\/td\u003e\n\u003ctd\u003e315–320 hp\u003c\/td\u003e\n\u003ctd\u003e335–340 lb-ft\u003c\/td\u003e\n\u003ctd\u003e9.60:1\u003c\/td\u003e\n\u003ctd\u003eAFM, E85-capable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eL76\u003c\/td\u003e\n\u003ctd\u003e6.0L\u003c\/td\u003e\n\u003ctd\u003e348–367 hp\u003c\/td\u003e\n\u003ctd\u003e376–385 lb-ft\u003c\/td\u003e\n\u003ctd\u003e10.40:1\u003c\/td\u003e\n\u003ctd\u003ealuminum block, AFM, VVT on truck versions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLFA\u003c\/td\u003e\n\u003ctd\u003e6.0L\u003c\/td\u003e\n\u003ctd\u003e332 hp\u003c\/td\u003e\n\u003ctd\u003e367 lb-ft\u003c\/td\u003e\n\u003ctd\u003e10.80:1\u003c\/td\u003e\n\u003ctd\u003ealuminum block, AFM, hybrid\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLZ1\u003c\/td\u003e\n\u003ctd\u003e6.0L\u003c\/td\u003e\n\u003ctd\u003e332 hp\u003c\/td\u003e\n\u003ctd\u003e367 lb-ft\u003c\/td\u003e\n\u003ctd\u003e10.80:1\u003c\/td\u003e\n\u003ctd\u003ealuminum block, AFM, VVT, hybrid\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLV3\u003c\/td\u003e\n\u003ctd\u003e4.3L\u003c\/td\u003e\n\u003ctd\u003e285 hp\u003c\/td\u003e\n\u003ctd\u003e305 lb-ft\u003c\/td\u003e\n\u003ctd\u003en\/a\u003c\/td\u003e\n\u003ctd\u003eV6, AFM, direct injection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eL83\u003c\/td\u003e\n\u003ctd\u003e5.3L\u003c\/td\u003e\n\u003ctd\u003e355–376 hp\u003c\/td\u003e\n\u003ctd\u003e383–416 lb-ft\u003c\/td\u003e\n\u003ctd\u003e11.00:1\u003c\/td\u003e\n\u003ctd\u003ealuminum block, AFM, VVT, direct injection, E85-capable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eQuick definitions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eOBD-II port:\u003c\/strong\u003e The standard diagnostic connector under the dash on every US vehicle since 1996.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSPID label:\u003c\/strong\u003e Service Parts Identification label listing the RPO codes on pre-2018 GM vehicles.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eRPO code:\u003c\/strong\u003e GM's three-character option code; engine codes begin with L.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAFM:\u003c\/strong\u003e Active Fuel Management, GM's cylinder deactivation system on the engines covered here.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eVIN 8th digit:\u003c\/strong\u003e The VIN character that identifies the engine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoD:\u003c\/strong\u003e Displacement on Demand, the original name for AFM.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDFM:\u003c\/strong\u003e Dynamic Fuel Management, the system on 2019-on L84 and L87 engines that can deactivate cylinders individually.\u003c\/p\u003e\u003ch2\u003eWhy oil matters on these engines\u003c\/h2\u003e\u003cp\u003eAn AFM engine has a solenoid valve assembly in the engine valley cover. Its solenoids send pressurized oil to special hydraulic roller lifters (supplied by Eaton and Delphi) on the deactivating cylinders, which then stop opening the valves. Because the system runs on oil pressure, oil quality matters: worn-out anti-foam additives, the wrong viscosity or overdue changes can delay the oil signal and upset the switching. The module stops the switching; the oil system still needs proper care.\u003c\/p\u003e\u003ch2\u003eWhere AFM came from\u003c\/h2\u003e\u003cp\u003eGM's first attempt was the 1981 Cadillac V8-6-4. Displacement on Demand followed in the 2005 model year on the 5.3L TrailBlazer EXT and Envoy XL\/XUV and on LS4-powered front-drive cars, and was renamed Active Fuel Management as it moved into the full-size trucks and SUVs. Dynamic Fuel Management, developed from Tula Technology's Dynamic Skip Fire, took over on the 2019 Silverado 1500 and Sierra 1500 V8s.\u003c\/p\u003e\u003ch2\u003eCommon questions\u003c\/h2\u003e\u003ch3\u003eCan I go back to factory AFM?\u003c\/h3\u003e\u003cp\u003eYes. Unplug the module and the factory cylinder-deactivation strategy works again.\u003c\/p\u003e\u003ch3\u003eDoes it plug into the OBD-II port on the Chevrolet Silverado 1500?\u003c\/h3\u003e\u003cp\u003eYes. It plugs into the OBD-II port under the dash. There is no wiring or splicing.\u003c\/p\u003e\u003ch3\u003eHow do I tell which engine my Chevrolet Silverado 1500 has?\u003c\/h3\u003e\u003cp\u003eCheck the 8th digit of the VIN or the RPO codes on the Service Parts Identification label (QR code on the door-pillar label on 2018 and newer GM models).\u003c\/p\u003e\u003ch3\u003eWill it fix lifter noise or misfires?\u003c\/h3\u003e\u003cp\u003eNo. Those are mechanical or electrical faults that need their own diagnosis and repair.\u003c\/p\u003e\u003ch3\u003eWhich Chevrolet Silverado 1500 years and engines does it fit?\u003c\/h3\u003e\u003cp\u003eThe fitment table lists Chevrolet Silverado 1500 2007–2018 with 4.3L V6, 5.3L V8, 6.0L V8. Match your exact year and engine to a row before ordering.\u003c\/p\u003e\u003ch3\u003eWill it add horsepower?\u003c\/h3\u003e\u003cp\u003eNo. It keeps all cylinders active; it does not change the engine tune.\u003c\/p\u003e\u003ch3\u003eDo I need to remove it for an emissions test or scan tool?\u003c\/h3\u003e\u003cp\u003eYes. It uses the diagnostic port, so unplug it while the port is needed and plug it back in afterwards.\u003c\/p\u003e\u003ch3\u003eIs a tune or ECU reflash required?\u003c\/h3\u003e\u003cp\u003eNo. The module plugs into the OBD-II port and does not rewrite the engine computer's software.\u003c\/p\u003e\u003ch3\u003eDoes it work on 2019 and newer trucks with Dynamic Fuel Management?\u003c\/h3\u003e\u003cp\u003eOnly the vehicles and engines in this listing's fitment table are covered. DFM on the 2019-on Silverado 1500 and Sierra 1500 (5.3L L84, 6.2L L87) is a different system, so do not assume coverage outside the table.\u003c\/p\u003e\u003ch3\u003eDoes it change anything when towing?\u003c\/h3\u003e\u003cp\u003eUnder heavy load, such as towing up a grade, AFM already keeps all cylinders running. The difference shows up during lighter cruising between climbs, where the engine no longer drops cylinders.\u003c\/p\u003e\u003ch3\u003eDo I need it if my engine already has an AFM delete?\u003c\/h3\u003e\u003cp\u003eNo. An engine with the AFM hardware removed and a matching tune no longer deactivates cylinders, so the module has nothing to manage.\u003c\/p\u003e\u003ch3\u003eHow much fuel does AFM save?\u003c\/h3\u003e\u003cp\u003eEPA-test estimates published for GM's system are about 5.5–7.5%, with the benefit coming from light-load cruising. Keeping all cylinders active gives up part of that, depending on how you drive.\u003c\/p\u003e\u003ch2\u003eShipping and support\u003c\/h2\u003e\u003cp\u003eStandard shipping inside the lower 48 states costs nothing; allow 1–2 business days of handling plus 3–4 in transit. Returns need approval first and must be requested within 45 days. Approved returns are subject to a 20% restocking fee, with return shipping paid by the customer. A 3-year limited warranty applies. Email support@automotivebypass.com (Mon–Fri, 9–5 PST) with your VIN if you want a fitment check.\u003c\/p\u003e","brand":"Automotivebypass","offers":[{"title":"Default Title","offer_id":56493781254516,"sku":"RC-AFM-DFM-01-01","price":79.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1030\/8439\/2820\/files\/RC-AFM-DFM-01-01-1.jpg?v=1793172133","url":"https:\/\/automotivebypass.com\/products\/afm-dfm-vcm-disabler-chevrolet-silverado-1500-2007-2018-afm-dfm-disabler","provider":"Automotivebypass","version":"1.0","type":"link"}