Duramax Diesel Repair

Duramax Diesel Repair Services

Master Tech Diesel Injection specializes in diagnosis, repair, and reliability upgrades for every generation of the Chevy and GMC Duramax diesel engine. Below is a complete list of the most common services we perform, organized by engine code.

LB7 (2001–2004)

• Fuel injector diagnosis, removal, and replacement (all 8 recommended)
• Crankcase dilution diagnostics (often requires injector removal and testing on our Bosch test stand for failed injector bodies)
• Fuel system contamination cleanup, including sonic washing of fuel lines and rails
• Fuel injector testing, replacement, and upgrades (in-house nozzle extrusion and injector balancing on our Bosch test stand)
• Water pump replacement
• Head gasket diagnosis and repair
• Fuel filter head / housing repair (air leaks)
• Lift pump installation and upgrades
• Complete fuel system diagnostics, replacements, and upgrades
• Steering and suspension repairs
• Brake pads and rotors replacement

LLY (2004.5–2005)

• Overheating diagnosis and cooling system upgrades
• VGT turbocharger diagnosis, failure analysis, replacement, and upgrades
• EGR cooler and EGR valve service
• Injector harness repair (chafing issues)
• Fuel injector testing, replacement, and upgrades (in-house nozzle extrusion and injector balancing on our Bosch test stand)
• Water pump replacement
• Head gasket diagnosis and repair
• Glow plug replacement
• Fuel filter head / housing repair (air leaks)
• Steering and suspension repairs
• Brake pads and rotors replacement

LBZ (2006–2007)

• Water pump replacement
• EGR valve service
• VGT turbocharger diagnosis and vane position sensor repair
• Fuel injector testing, replacement, and upgrades (in-house nozzle extrusion and injector balancing on our Bosch test stand)
• CP3 injection pump service
• Exhaust manifold and up-pipe repair
• Cooling system diagnosis and upgrades
• Steering and suspension repairs
• Brake pads and rotors replacement

LMM (2007.5–2010)

• DPF cleaning and regen system diagnosis
• EGR cooler and EGR valve service
• VGT turbocharger diagnosis, actuator, and vane repair
• Fuel injector testing, replacement, and upgrades (in-house nozzle extrusion and injector balancing on our Bosch test stand)
• CP3 injection pump service
• Exhaust manifold and up-pipe repair
• Transmission cooler line repair (common leak point)
• Complete emissions system diagnostics
• Steering and suspension repairs
• Brake pads and rotors replacement

LML (2011–2016)

• Bosch CP4 high-pressure fuel pump diagnosis and replacement
• CP3 conversion (preventive or after failure)
• Complete fuel system contamination cleanup (rails, injectors, lines, and tank)
• Fuel injector testing, replacement, and upgrades (in-house nozzle extrusion and injector balancing on our Bosch test stand)
• EGR cooler and EGR valve service
• DPF / DEF / SCR system diagnosis and repair
• NOx sensor replacement
• VGT turbocharger diagnosis and repair
• Water pump replacement
• Steering and suspension repairs
• Brake pads and rotors replacement

L5P (2017–Present)

• DEF system diagnosis and repair (heater, injector, and quality sensor)
• NOx sensor replacement
• MAP sensor cleaning and replacement
• Glow plug replacement
• VGT turbocharger diagnosis and actuator repair
• Charge air cooler / boost leak diagnosis and repair
• EGR system service
• DPF / SCR system diagnosis
• Fuel injector connector diagnosis and repair (especially #4)
• Complete emissions and drivability diagnostics
• Steering and suspension repairs
• Brake pads and rotors replacement

Additional Duramax Services (All Generations)

• Full computer diagnostics and drivability diagnosis
• Preventive maintenance packages tailored to each generation
• Reliability and performance upgrade packages
• Complete engine replacement when required

Looking for service on a specific year or problem? Contact us for diagnosis and a clear repair plan.

Serving the Treasure Valley

We provide Duramax diesel diagnosis, repair, and reliability upgrades for customers throughout the Treasure Valley, including:

• Boise
• Meridian
• Nampa
• Caldwell
• Kuna