Cold Ambient Derate Mode Indicator

Derate Mode

This is a Cold Ambient Derate Mode Indicator symbol. Derate is a term used to indicate that the engine’s power has been reduced or derated. Derating the engine protects the turbocharger in cold temperatures and the indicator is shown when the system is active. The indicator appears as a fan in a duct with wavy lines and arrows below it in yellow/amber.

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Deration takes place during start up and is generally associated with diesel engines. Engine power will be reduced for as long as 30 seconds depending on just how cold the ambient temperatures are, beginning at about 10°F (-12°C) and below.

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