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Yet another common problem with the 2005–2016 fourth generation V8 LS engines was a failure of the specialized lifters in engines equipped with the AFM system. While in AFM operation, the lifters would sometimes fail to come out of AFM mode and cause the engine to go into 'limp home' mode. In this mode damage could occur to the pistons, camshaft, or the lifters themselves. The resulting solution was a package of components that would replace the lifters, lifter guides, camshaft, Valve Lifter Oil Manifold (VLOM) plate. Cylinder heads were required to be removed from the engine in order to replace all the components. The engine computer also required reprogramming to permanently Disable AFM.
<ref>{{cite web|url=https://help.summitracing.com/app/answers/detail/a_id/4901/~/ls-engine-tech-%E2%80%93-active-fuel-management-%28afm%29|title=LS
<ref>{{cite web | url=https://www.youtube.com/watch?v=GcuC2FxozE8 | title=Why and How to Disable GM's Active Fuel Management (AFM)! | website=[[YouTube]] | date=April 28, 2021 | access-date=September 12, 2023 | archive-date=October 11, 2023 | archive-url=https://web.archive.org/web/20231011042913/https://www.youtube.com/watch?v=GcuC2FxozE8 | url-status=live }}</ref>
<ref>{{cite web | url=https://www.youtube.com/watch?v=DNxBaSDD5q8 | title=SDPC Tech Tips: DOD/AFM Delete 101 | website=[[YouTube]] | date=March 11, 2019 | access-date=September 12, 2023 | archive-date=October 11, 2023 | archive-url=https://web.archive.org/web/20231011042912/https://www.youtube.com/watch?v=DNxBaSDD5q8 | url-status=live }}</ref>
<ref>{{cite web | url=https://gmauthority.com/blog/2023/02/17-plaintiffs-sent-to-arbitration-in-gm-v8-engine-valve-lifter-lawsuit/ | title=17 Plaintiffs Sent to Arbitration in GM Valve Lifter Lawsuit | date=February 24, 2023 | access-date=September 12, 2023 | archive-date=December 17, 2023 | archive-url=https://web.archive.org/web/20231217193911/https://gmauthority.com/blog/2023/02/17-plaintiffs-sent-to-arbitration-in-gm-v8-engine-valve-lifter-lawsuit/ | url-status=live }}</ref>
<ref>{{cite web | url=https://www.autocornerd.com/chevy-afm-problem-years/ | title=Chevy AFM Problem Years (Is It Serious?) - Autocornerd | date=July 4, 2022 | access-date=September 12, 2023 | archive-date=July 17, 2024 | archive-url=https://web.archive.org/web/20240717090456/https://www.autocornerd.com/chevy-afm-problem-years/ | url-status=live }}</ref>
<ref>{{cite web|url=https://www.melling.com/wp-content/uploads/2018/03/Melling-tech-bulletin-on-GM-LS-Deactivation-Lifter-Issues-3.1.18-1.pdf|title=Technical
<ref>{{cite web | url=https://www.classaction.org/gm-lifter-problems-lawsuit | title=GM Lifter Problems Could Lead to Class Action Lawsuit | date=October 14, 2021 | access-date=September 12, 2023 | archive-date=June 23, 2024 | archive-url=https://web.archive.org/web/20240623080748/https://www.classaction.org/gm-lifter-problems-lawsuit | url-status=live }}</ref>
<ref>{{cite web | url=https://considertheconsumer.com/consumer-class-actions/general-motors-faulty-afm-lifters-class-action-lawsuit-selling-cars-that-result-in-the-valve-train-defect | title=General Motors Faulty AFM Lifters Class Action Lawsuit: Valve Train Defect | work=Consider The Consumer | date=January 4, 2022 |archive-url=https://web.archive.org/web/20220104102943/https://considertheconsumer.com/consumer-class-actions/general-motors-faulty-afm-lifters-class-action-lawsuit-selling-cars-that-result-in-the-valve-train-defect|archive-date=Jan 4, 2022|url-status=dead}}</ref>
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