GM / Chevrolet / GMC 6.6L Duramax
Duramax head gasket repair
Head gasket diagnosis for the Duramax, most commonly on the 2004.5–2005 LLY.
Why this matters on the 6.6L Duramax
The LLY is known for overheating under load and head gasket concerns; testing confirms before a major repair.
Symptoms owners notice
- Overheating when towing
- Coolant loss
- White smoke
What we check
- Combustion leak test
- Pressure test
Repair work involved
- Head gasket replacement with related cooling repairs
Trucks with the 6.6L Duramax
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