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2026 Chevrolet Silverado 1500

Reliability tier: verified - see /disclosure/

Engine: 3.0L Duramax LZ0 (Duramax, 3.0L)

LZ0 refresh of the 3.0L Duramax I6: 305 hp / 495 lb-ft; reworked pistons, heads and injectors, DOC moved closer to the engine; same 10L80 10-speed.

Applicable failure modes (8)

• Coolant flow control valve failure (active thermal management)
• DEF system faults: tank heater, pump/quality (speed-limited derate)
• DPF regeneration and ash-loading faults
• EGR system failures: valve, cooler, wiring (derate-prone)
• Extended crank / long-crank no-start (air intrusion, check valve, cam wheel)
• NOx sensor / SCR efficiency codes
• LZ0 crankshaft thrust bearing failure (GM bulletin 25-NA-307)
• Turbo and boost-path faults (coolant line, charge air)

Applicable parts (3)

• DEF refill - fresh API-certified fluid (service item, all 3.0L Duramax)
• DPF cleaning service (professional bake-and-blow, off-truck)
• 3.0L Duramax Drop-In Fuel System / Lift Pump (FASS, 2019-2026 GM 3.0 LM2/LZ0)

Platform recipes (4)

• Coolant flow control valve job for the 3.0L Duramax (mode fm-lm2-coolant-control-valve): high fan, fluctuating temp, P1098, 'Engine Power Reduced'
• DEF tank-side service for the 3.0L Duramax (mode fm-lm2-def-system): the 'Exhaust Fluid System' warnings walk up a derate ladder to 5 mph
• EGR cooler / valve job for the 3.0L Duramax (mode fm-lm2-egr-system): rarely named in NHTSA complaints (8 of 1,190) but forum-documented - recurring 'Service Emission System' with the 65-mph derate
• Fuel filter service with a proper prime for the 3.0L Duramax (mode fm-lm2-long-crank): the #1 self-inflicted long-crank is air trapped after a filter change - seat the housing fully, cycle key-on and let the pump prime before cranking