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2012 Chevrolet Express 2500
Reliability tier: verified - see /disclosure/
Engine: 6.6L Duramax LGH (van tune) (Duramax, 6.6L)
The LGH van derate: 260 hp @ 3,100 / 525 lb-ft @ 1,600 (C/D MY2011 spec sheet; motormatchup MY2015) - the LML-family hardware at a heavy van tune (the LGH chassis-cab rating - Silverado/Sierra HD with RPO ZW9, chassis cab / box delete - is 335/685; the Kodiak/TopKick line ended in 2009 and never carried the LGH). 6L90-E. The vans carried the LGH through MY2016; the 6.6L diesel was then discontinued in the vans (replaced by the 2.8L LWN I4).
Applicable failure modes (9)
- Cooling system wear: water pump, fan clutch, oil cooler (LML)
- Bosch CP4.2 high-pressure pump failure and fuel-system contamination
- DEF system failures: tank heater, dosing, quality (LML)
- DPF regeneration service (retained system)
- EGR valve / cooler carbon and coolant service (LML)
- Glow plug / control module cold-start service (LML)
- Piezo injector failures / replacement economics (LML)
- NOx sensor failures (LML SCR system)
- VGT turbo vane carbon / actuator wear (Garrett VVT)
Applicable parts (27)
- Duramax LML Auxiliary Heated Fuel Filter Kit, 2011-2016
- duramax-lml: charge-air-cooler-pipe (honest catalog gap)
- duramax-lml: def-fluid (service item)
- Duramax LML DEF Pump/Module Kit (OEM)
- Duramax LML DEF Tank Module (OEM)
- duramax-lml: dpf-pressure-pipe (honest catalog gap)
- Duramax LML DPF Pressure Sensor, Early Chain (OEM)
- Duramax LGH EGR Cooler, van (12650369)
- Duramax LML Fuel Contamination Repair Kit, 2011-2016 (Alliant Power / XDP)
- Duramax LML Fuel Injection Pressure Relief Valve (OEM)
- Duramax LML Fuel Injection Rail, Left (OEM)
- Duramax LML Fuel Injection Rail, Right (OEM)
- Duramax LML Glow Plug (OEM)
- Duramax LML Glow Plug Control Module 2011-2012 (OEM)
- Duramax LGH Injector Kit, van (19210900)
- Duramax LML Engine Oil Cooler Assembly (OEM)
- Duramax LML In-Tank Lift Pump Upgrade (Fleece PowerFlo, 2011-2016)
- Duramax LML Silicone Coolant Hose Kit (PPE, 2011-2016)
- Duramax LGH High-Pressure Pump Kit, van (19420325)
- Duramax LML Rail Pressure Sensor (OEM)
- Duramax LML Exhaust-Tract Fuel Injector for DPF Regeneration (OEM)
- duramax-lml: thermostat (honest catalog gap)
- Duramax LGH Turbocharger Assembly (2011+, van) (12640123)
- Duramax LML Turbocharger Control Valve (OEM)
- Duramax LML Turbocharger Sensor (OEM)
- Turbocharger Speed Sensor, Shared GM Diesel Service Part (OEM)
- Duramax LML Water Pump (OEM)
Platform recipes (4)
- Bosch CP4.2 contamination repair for the LML (mode fm-lml-cp4-pump-failure): the pump's roller wears through and floods the high-pressure circuit with metal
- DEF subsystem repair for the LML (mode fm-lml-def-system) - the first DEF/SCR Duramax, and the early years carry the heaviest complaint load
- Low-pressure fuel system health for the LML (mode fm-lml-cp4-pump-failure's prevention side and fm-lml-injector-failure): the LML has an in-tank lift pump feeding the CP4, and a rail relief valve that opens under overpressure
- Cold-start repair for the LML (mode fm-lml-glow-plug): glow plugs fail open with age and the control module's drivers fail with or without plug faults