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GMC Sierra 1500 T1XX (5th Generation)
2019–2026 · GMT T1XX · truck
Fifth-generation Sierra 1500 on the T1XX platform (sibling to T1XX Silverado / Tahoe / Yukon). Engines: 2.7L L3B turbo I4, 5.3L L84 V8 (DFM), 6.2L L87 V8, 3.0L LM2/LZ0 Duramax inline-six diesel. 10-speed automatic on most. MultiPro tailgate (six functional positions), optional CarbonPro carbon-fiber bed.
Watch out: 3.0L LM2 Duramax CP4.2 fuel pump failure on 2020-2022 trucks — pump shrapnel can wreck the entire fuel system; $10,000+ repair. NHTSA investigation EA22-002 documented the pattern across GM 3.0L diesel applications.
Full clubhouse — owner Garage Lineage, common problems, year-by-year notes, and product picks — is on the build list.
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