GM / Chevrolet / GMC 6.6L Duramax
Duramax turbocharger service
Turbo diagnosis for fixed-geometry LB7 and variable-geometry later Duramax engines.
Why this matters on the 6.6L Duramax
From the LLY onward the Duramax uses a variable-geometry turbo; vane and actuator faults reduce power.
Symptoms owners notice
- Low power
- Turbo noise
- Boost codes
What we check
- Boost test
- Actuator test
Repair work involved
- Turbo repairs
Trucks with the 6.6L Duramax
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