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GMC Sierra 1500 K2XX (4th Generation)

2014–2018 · GMT K2XX · truck

Fourth-generation Sierra 1500 on the K2XX platform (sibling to K2XX Silverado / Tahoe / Yukon). EcoTec3 lineup: 4.3L LV3 V6, 5.3L L83 V8, 6.2L L86 V8. AFM standard on V8s. 6-speed (5.3L), 8-speed 8L90 (6.2L from 2015). Denali Ultimate adds magnetic ride.

Watch out: Same AFM-induced 5.3L L83 lifter failure as the Silverado K2XX. 8-speed 8L90 transmission shudder on early 6.2L Sierras is the second most common complaint.

Full clubhouse — owner Garage Lineage, common problems, year-by-year notes, and product picks — is on the build list.

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