{"product_id":"afm-dfm-vcm-disabler-buick-lacrosse-lacrosse-cxs-2005-2018-afm-dfm-disabler","title":"Buick LaCrosse \/ LaCrosse CXS 2005-2018 3.6L\/5.3L V6\/V8 AFM\/DFM Disabler","description":"\u003cp\u003eA plug-in cylinder-deactivation disabler for the 2005–2008 Buick LaCrosse CXS and 2006–2009, 2016–2018 Buick LaCrosse. 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\u003eWhat it fits\u003c\/h2\u003e\u003cp\u003eEach row below is listed as a 100% fitment match:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e2005–2008 Buick LaCrosse CXS: 3.6L V6\u003c\/li\u003e\n\u003cli\u003e2006–2009 Buick LaCrosse: 5.3L V8\u003c\/li\u003e\n\u003cli\u003e2016–2018 Buick LaCrosse: 3.6L V6\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\u003cli\u003eLS4 (5.3L, 2005–2009, VIN 8th digit \"C\")\u003c\/li\u003e\u003c\/ul\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\u003eThe factory system in brief\u003c\/h2\u003e\u003cp\u003eGM's Active Fuel Management turns a V8 into a V4 at light load by deactivating cylinders 1, 7, 6 and 4. Solenoids route oil pressure to the lifters on those cylinders, which collapse and stop opening the valves. Fuel to those cylinders is cut at the same time. Press the throttle harder and the system brings all eight back.\u003c\/p\u003e\u003ch2\u003eDiagnose existing problems first\u003c\/h2\u003e\u003cp\u003eKeep the oil at the correct level and grade before and after installation. AFM lifters and their solenoids are oil-pressure operated, so an engine that is low on oil or running the wrong grade should be sorted out first. The module stops the switching, but it is not a substitute for maintenance or for repairing an engine that already has a fault.\u003c\/p\u003e\u003ch2\u003eWhat changes when you 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\u003eHow this differs from an AFM delete kit\u003c\/h2\u003e\u003cp\u003eOwners who want AFM gone for good sometimes go the mechanical route: non-AFM lifters, a matching camshaft and a retune. That is a large job and it is permanent. A tuner can also disable AFM in the engine computer. The plug-in module sits at the other end of the scale: no parts replaced, no software rewritten, and back to factory with one pull. It is meant for engines that run well and simply should not switch modes.\u003c\/p\u003e\u003ch2\u003eWhy owners disable it\u003c\/h2\u003e\u003cp\u003eA Buick LaCrosse CXS and Buick LaCrosse with AFM switches modes many times on a typical drive. Some owners never notice; others feel it every time. If you are in the second group, or you tow and want steady behavior, keeping all cylinders active is the simplest answer. Fuel use at light cruise will usually rise a little, since that is where AFM saves fuel.\u003c\/p\u003e\u003ch2\u003eEngine care\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\u003eUsing it day to day\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\u003eConfirm your engine\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eYour model year, model and engine match a row in the table (2005–2008 Buick LaCrosse CXS and 2006–2009, 2016–2018 Buick LaCrosse).\u003c\/li\u003e\n\u003cli\u003eFind your engine code. On GM vehicles before the 2018 model year, the Service Parts Identification label (usually inside the glovebox on these trucks and SUVs) lists the three-character RPO codes, and the engine code starts with L. From 2018, GM moved that data into a QR code on the certification label on the driver-side door pillar. The 8th character of the VIN also identifies the engine.\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\u003eFitment table with engine codes\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\u003e2006\u003c\/td\u003e\n\u003ctd\u003eBuick\u003c\/td\u003e\n\u003ctd\u003eLaCrosse\u003c\/td\u003e\n\u003ctd\u003e5.3L V8\u003c\/td\u003e\n\u003ctd\u003eLS4\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\u003e2007\u003c\/td\u003e\n\u003ctd\u003eBuick\u003c\/td\u003e\n\u003ctd\u003eLaCrosse\u003c\/td\u003e\n\u003ctd\u003e5.3L V8\u003c\/td\u003e\n\u003ctd\u003eLS4\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\u003eBuick\u003c\/td\u003e\n\u003ctd\u003eLaCrosse\u003c\/td\u003e\n\u003ctd\u003e5.3L V8\u003c\/td\u003e\n\u003ctd\u003eLS4\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\u003eBuick\u003c\/td\u003e\n\u003ctd\u003eLaCrosse\u003c\/td\u003e\n\u003ctd\u003e5.3L V8\u003c\/td\u003e\n\u003ctd\u003eLS4\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\u003eBuick\u003c\/td\u003e\n\u003ctd\u003eLaCrosse\u003c\/td\u003e\n\u003ctd\u003e3.6L V6\u003c\/td\u003e\n\u003ctd\u003eConfirm by VIN\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\u003eBuick\u003c\/td\u003e\n\u003ctd\u003eLaCrosse\u003c\/td\u003e\n\u003ctd\u003e3.6L V6\u003c\/td\u003e\n\u003ctd\u003eConfirm by VIN\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\u003eBuick\u003c\/td\u003e\n\u003ctd\u003eLaCrosse\u003c\/td\u003e\n\u003ctd\u003e3.6L V6\u003c\/td\u003e\n\u003ctd\u003eConfirm by VIN\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\u003e2005\u003c\/td\u003e\n\u003ctd\u003eBuick\u003c\/td\u003e\n\u003ctd\u003eLaCrosse CXS\u003c\/td\u003e\n\u003ctd\u003e3.6L V6\u003c\/td\u003e\n\u003ctd\u003eConfirm by VIN\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\u003e2006\u003c\/td\u003e\n\u003ctd\u003eBuick\u003c\/td\u003e\n\u003ctd\u003eLaCrosse CXS\u003c\/td\u003e\n\u003ctd\u003e3.6L V6\u003c\/td\u003e\n\u003ctd\u003eConfirm by VIN\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\u003e2007\u003c\/td\u003e\n\u003ctd\u003eBuick\u003c\/td\u003e\n\u003ctd\u003eLaCrosse CXS\u003c\/td\u003e\n\u003ctd\u003e3.6L V6\u003c\/td\u003e\n\u003ctd\u003eConfirm by VIN\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\u003eBuick\u003c\/td\u003e\n\u003ctd\u003eLaCrosse CXS\u003c\/td\u003e\n\u003ctd\u003e3.6L V6\u003c\/td\u003e\n\u003ctd\u003eConfirm by VIN\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\u003eIf something seems wrong\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\u003eWhich 3.6L V6 engines have AFM\u003c\/h2\u003e\u003cp\u003eNot every GM 3.6L V6 deactivates cylinders. The LGX, which arrived in the 2016 Camaro, has Active Fuel Management and shuts down cylinders 2 and 5 at light load. The LGZ in the 2017-on Colorado and Canyon also has AFM and is paired with the 8-speed automatic. The earlier LFX (used, for example, in the 2015–2016 Colorado and Canyon) and the LFY in the 2018 Traverse and Enclave have no cylinder deactivation, so the module has nothing to control on them. Check the RPO code before ordering.\u003c\/p\u003e\u003ch2\u003eGlossary\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\u003eDoD:\u003c\/strong\u003e Displacement on Demand, the original name for AFM.\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\u003eRPO code:\u003c\/strong\u003e GM's three-character option code; engine codes begin with L.\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\u003eThe hardware behind AFM\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\u003eBefore you plug it in\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eClear up any warning lights first: the module is for a healthy engine.\u003c\/li\u003e\n\u003cli\u003eConfirm oil level and grade.\u003c\/li\u003e\n\u003cli\u003eTurn everything off.\u003c\/li\u003e\n\u003cli\u003ePlug the module into the OBD-II port.\u003c\/li\u003e\n\u003cli\u003eCheck it is fully seated and cannot be kicked loose.\u003c\/li\u003e\n\u003cli\u003eStart the engine.\u003c\/li\u003e\n\u003cli\u003eCruise lightly on a level road to confirm all cylinders stay active.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWhere AFM came from\u003c\/h2\u003e\u003cp\u003eGM first sold cylinder deactivation in 1981 with the Cadillac V8-6-4. The modern system was announced in 2003 as Displacement on Demand and reached production on the 2005 Chevrolet TrailBlazer EXT and GMC Envoy XL and XUV with the 5.3L V8, followed by the 5.3L LS4 in the Impala SS, Monte Carlo SS and Pontiac Grand Prix GXP. Renamed Active Fuel Management, it spread across GM's Gen IV and EcoTec3 truck engines. For the 2019 Silverado, GM introduced Dynamic Fuel Management, based on Tula Technology's Dynamic Skip Fire, which can deactivate cylinders individually.\u003c\/p\u003e\u003ch2\u003eThe engines behind the codes\u003c\/h2\u003e\u003cul\u003e\u003cli\u003e\n\u003cstrong\u003eLS4\u003c\/strong\u003e: 5.3L V8 mounted transversely in front-drive cars such as the Impala SS, Monte Carlo SS and Grand Prix GXP. VIN engine digit \"C\".\u003c\/li\u003e\u003c\/ul\u003e\u003ch2\u003eEngine specifications\u003c\/h2\u003e\u003cp\u003ePublished output and key features of the relevant engines. Exact ratings depend on the vehicle and model 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\u003ctr\u003e\n\u003ctd\u003eLS4\u003c\/td\u003e\n\u003ctd\u003e5.3L\u003c\/td\u003e\n\u003ctd\u003e300–303 hp\u003c\/td\u003e\n\u003ctd\u003e323 lb-ft\u003c\/td\u003e\n\u003ctd\u003e10.00:1\u003c\/td\u003e\n\u003ctd\u003ealuminum block, AFM, front-wheel drive\u003c\/td\u003e\n\u003c\/tr\u003e\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eQuestions owners ask\u003c\/h2\u003e\u003ch3\u003eDoes it plug into the OBD-II port on the Buick LaCrosse CXS and Buick LaCrosse?\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\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\u003eHow do I tell which engine my Buick LaCrosse CXS and Buick LaCrosse 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\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\u003eWhich Buick LaCrosse CXS and Buick LaCrosse years and engines does it fit?\u003c\/h3\u003e\u003cp\u003eThe fitment table lists Buick LaCrosse CXS 2005–2008; Buick LaCrosse 2006–2009, 2016–2018 with 3.6L V6, 5.3L V8. Match your exact year and engine to a row before ordering.\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\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\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\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\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 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\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\u003ch2\u003eWarranty and returns\u003c\/h2\u003e\u003cp\u003eShipping is free to the contiguous US. Orders leave in 1–2 business days and usually arrive 3–4 business days later. Returns are accepted within 45 days with pre-approval; a 20% restocking fee applies and the buyer covers return shipping. The part carries a 3-year limited warranty, and support@automotivebypass.com answers Monday to Friday, 9–5 Pacific.\u003c\/p\u003e","brand":"Automotivebypass","offers":[{"title":"Default Title","offer_id":56493787349364,"sku":"RC-AFM-DFM-01-41","price":79.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1030\/8439\/2820\/files\/RC-AFM-DFM-01-41-1.jpg?v=1793172579","url":"https:\/\/automotivebypass.com\/products\/afm-dfm-vcm-disabler-buick-lacrosse-lacrosse-cxs-2005-2018-afm-dfm-disabler","provider":"Automotivebypass","version":"1.0","type":"link"}