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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Remember that only proper service and repair procedures will ensure the safe and reliable operation of your car. In addition, proper safety procedures and precautions, such as the use of safety goggles, the right tools and the equipment should be followed at all times to eliminate the possibility of personal injury or improper service which could damage the vehicle or compromise its safety.
These posts are for information sharing purposes only, and should not be used in lieu of an OEM service manual or factory authorized service procedure. We are not in the auto repair business nor do we publish automotive service manuals. Nothing we include on these pages and posts has been reviewed, approved or authorized by any vehicle manufacturer.
Technology is always changing and what is current and accurate today may be literally out-of-date and inaccurate tomorrow. And when it comes to the current state of flux in the auto industry, nothing is more true.
The author has 25 years of automotive experience and has assembled the most extensive collection of symbols and warning lights anywhere (over 1,000!) and can help you open and start any keyless start car with a dead key fob battery. BA, St. Joseph’s College, ME: MS, Rensselaer Polytechnic Institute, NY
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