Glow Plug, Battery Conditioning Indicator

Glow Plug

As of 2024, this indicator has two uses. Its origin is as a Glow Plug Indicator symbol, which is found only in diesel-powered vehicles, sedans or trucks. The second is as a Battery Conditioning indicator, where an Electric Vehicle’s (EV) main battery is being conditioned prior to charging.

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Diesel engines require heat in the cylinders to operate, which is supplied initially by the glow plugs when the engine is cold. This light will be illuminated when the ignition is turned on until the plugs are heated sufficiently to start the engine. The engine simply won’t start until then. The image will look like a coil or loops in amber or yellow.

In the EV, the light is only seen during battery conditioning and is used by Kia. This process warms a cold battery to allow it to accept a charge more quickly.

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The information on this website is provided 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.

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.

Technology is always changing and what is current and accurate today may be literally out-of-date and inaccurate tomorrow.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.

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