White smoke from a Duramax diesel engine can be caused by several factors, including incomplete combustion due to a faulty injector, a malfunctioning fuel system, or a clogged air filter. Additionally, it can indicate coolant entering the combustion chamber, often due to a head gasket failure or a cracked cylinder head. Cold weather can also lead to temporary white smoke during startup as the engine warms up. Regular maintenance and diagnostics are essential to pinpoint the exact cause.
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