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Duramax platform

Duramax 6.6L V8 Turbo Diesel (GM HD, LB7-LMM 2001-2010)

2001-2010 · 6.6L · General Motors

56
vehicle configs
6
failure modes
56
parts
6
recipes
1 + 0
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3
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Failure modes

LMM DPF-era service (regeneration / ash service)
EGR cooler clogging / failure (LB7-LMM)
CP3 pump / fuel system contamination
Head gasket failures (higher mileage / load)
LB7 injector failures (the defining repair of the generation)
VGT turbo vane carbon / actuator wear (LLY+)

Parts

Duramax LB7 CP3 Injection Pump (Reman OEM) part-dmx-cp3-pump-lb7 Duramax LBZ/LMM CP3 Injection Pump (Reman OEM) part-dmx-cp3-pump-lbz-lmm Duramax LLY CP3 Injection Pump (Reman OEM) part-dmx-cp3-pump-lly Duramax CP3 Fuel Injection Pump Seal (OEM) part-dmx-cp3-seal-kit duramax-lb7-lmm: dpf (honest catalog gap) part-dmx-dpf-gap Duramax LMM DPF Differential Pressure Pipe (OEM) part-dmx-dpf-pressure-pipe Duramax LMM DPF Differential Pressure Sensor (OEM) part-dmx-dpf-pressure-sensor Duramax LB7 EGR Cooler (OEM) part-dmx-egr-cooler-lb7 Duramax LBZ EGR Cooler (OEM) part-dmx-egr-cooler-lbz Duramax LLY EGR Cooler (OEM) part-dmx-egr-cooler-lly Duramax LMM EGR Cooler (OEM) part-dmx-egr-cooler-lmm Duramax LB7 EGR Valve (OEM) part-dmx-egr-valve-lb7 Duramax LBZ/LMM EGR Valve (OEM) part-dmx-egr-valve-lbz-lmm Duramax LLY EGR Valve (OEM) part-dmx-egr-valve-lly Duramax Exhaust Manifold (OEM) part-dmx-exhaust-manifold Duramax LB7 Performance Sending Unit, Fleece SureFlo (2001-2004, for an aftermarket lift pump) part-dmx-fleece-sureflo-sender-lb7 Duramax LLY+ Fuel Filter Assembly (OEM) part-dmx-fuel-filter-assembly-lly-plus Duramax LB7 Fuel Filter Head Assembly (OEM) part-dmx-fuel-filter-head-lb7 Duramax Fuel Filter Heater (OEM) part-dmx-fuel-filter-heater Duramax Fuel Filter Service Kit (OEM) part-dmx-fuel-filter-kit Duramax LLY+ Fuel Filter Shell Assembly (OEM) part-dmx-fuel-filter-shell-lly-plus Duramax CP3 Fuel Pressure Service Valve (OEM) part-dmx-fuel-pressure-relief-valve Duramax LLY Common Rail Assembly (OEM) part-dmx-fuel-rail-lly Duramax LLY/LBZ/LMM Fuel Tank Module Kit (OEM) part-dmx-fuel-tank-module-lly-lmm Duramax LB7 Fuel Tank Sender (OEM) part-dmx-fuel-tank-sender-lb7 Duramax LB7 Glow Plug Control Module (OEM) part-dmx-glow-plug-control-module-lb7 Duramax LB7 Glow Plug (OEM) part-dmx-glow-plug-lb7 Duramax LBZ/LMM Glow Plug (OEM) part-dmx-glow-plug-lbz-lmm Duramax LLY Glow Plug (OEM) part-dmx-glow-plug-lly Duramax LBZ/LMM Cylinder Head Gasket Kit, W/O Head Gaskets (OEM) part-dmx-head-gasket-kit-lbz-lmm Duramax LLY Cylinder Head Gasket Kit, Less Head Gaskets (OEM) part-dmx-head-gasket-kit-lly Duramax LB7 Head Gasket Kit - Solid Seal, w/ Grade-C Head Gasket part-dmx-head-gasket-kit-solid-seal-lb7 Duramax LBZ Head Gasket Kit - Solid Seal, w/ Grade-C Head Gasket part-dmx-head-gasket-kit-solid-seal-lbz Duramax LMM Head Gasket Kit - Solid Seal, w/ Grade-C Head Gasket part-dmx-head-gasket-kit-solid-seal-lmm Duramax LB7/LLY Cylinder Head Gasket, Grade-Coded (OEM) part-dmx-head-gasket-lb7-lly Duramax 6.6L Head Stud Kit (LB7-LMM 2001-2010) part-dmx-head-stud-kit Duramax LB7 Fuel Injector Kit 8 pcs (Reman OEM) part-dmx-injector-kit-lb7 Duramax LBZ Fuel Injector (OEM) part-dmx-injector-lbz Duramax LLY Fuel Injector (OEM) part-dmx-injector-lly Duramax LMM Fuel Injector (Reman OEM) part-dmx-injector-lmm Duramax 2001-2010 Lift Pump Upgrade (FASS Titanium Signature C10 100G) part-dmx-lift-pump-fass-c10 Duramax Engine Oil Cooler Assembly (OEM) part-dmx-oil-cooler Duramax LB7 In-Tank Lift Pump Upgrade (Fleece PowerFlo, 2001-2004) part-dmx-powerflo-lift-pump Duramax LB7 Fuel Rail Pressure Sensor (OEM) part-dmx-rail-pressure-sensor-lb7 Duramax Engine Coolant Thermostat (OEM) part-dmx-thermostat Duramax Turbo Control Solenoid Valve (OEM) part-dmx-turbo-control-solenoid Duramax Turbo Coolant Thermostat Assembly (OEM) part-dmx-turbo-coolant-thermostat Duramax LB7 Turbocharger (Reman OEM) part-dmx-turbo-lb7 Duramax LBZ Turbocharger Assembly (OEM) part-dmx-turbo-lbz Duramax LLY Turbocharger (OEM) part-dmx-turbo-lly Duramax LMM Turbocharger Assembly (OEM) part-dmx-turbo-lmm Duramax LBZ/LMM Turbo Vane Position Sensor (OEM) part-dmx-turbo-vane-sensor-lbz-lmm Duramax LLY Turbo Vane Position Sensor (OEM) part-dmx-turbo-vane-sensor-lly Duramax LB7/LLY Water Pump (OEM) part-dmx-water-pump-lb7-lly Duramax LBZ/LMM Water Pump (OEM) part-dmx-water-pump-lbz-lmm Duramax Water-In-Fuel Indicator Sensor (OEM) part-dmx-wif-sensor

Recipes

CP3 and fuel-system contamination service (fm-dmx-fuel-system-health): the Bosch CP3 is fed by the OEM filter setup, and water/debris are the standing threats
LMM DPF-era service (fm-dmx-dpf-era-service): the LMM (from mid-2007) is the first DPF Duramax
EGR cooler service (fm-dmx-egr-cooler): the Duramax has carried cooled EGR since the LB7 (catalog-verified 97288793 for 2002-2004) and the coolers clog with carbon and eventually leak - the LLY-era heat reputation makes cooler health the first check on heat complaints
Head-gasket replacement path (fm-dmx-head-gaskets): stock gaskets age and elevated cylinder pressures finish them
Repair path for the LB7's defining failure (fm-dmx-lb7-injectors): hard starts, white smoke, fuel dilution on 2001-early-2004 trucks
VGT turbo service path (fm-dmx-vgt-turbo): boost flutter, slow spool, smoke under load

From the blog

Buyer's guideDuramax 6.6L V8 Turbo Diesel

Buying a Used Duramax: LB7, LLY, LBZ or LMM (2001-2010)? What Each One Is Known For

· 12 min read

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