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What are the known lifter failures on the Sierra's 5.3L and 6.2L EcoTec3 V8s?
The 5.3L L84 and 6.2L L87 EcoTec3 V8 engines in 2019–2022 Sierra trucks developed hydraulic lifter failures tied to the AFM/DFM cylinder deactivation system. Repeated deactivation of four out of eight cylinders caused premature lifter wear on certain production batches, presenting as a metallic ticking noise when cold and cylinder-deactivation fault codes. GM extended powertrain warranty coverage on affected units and launched a lifter replacement campaign. On a used 2019–2022 Sierra with a V8, confirm the campaign status through the VIN before purchase; if incomplete, negotiate the repair as a condition of sale.