High Voltage Battery Overheat and Cooling Indicators

Battery Overheat

These are Hybrid or High Voltage Battery Overheat Indicator symbols. It will illuminate if the temperature of the inverter with converter assembly or the battery itself is too high. The first appears as a household battery with wavy or squiggly lines rising from it, meant to imply heat waves. The second looks like a standing household battery with a thermometer alongside in red.

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Stop the vehicle and allow some time for the system to cool down.

Similarly, this symbol is a Traction Battery Coolant Fluid Level Low indicator. Seen primarily in some hybrid vehicles is a battery cooling system that, much like a typical internal combustion engine requires a cooling fluid that may require topping off occasionally.

The  is seen as a battery with a wavy line at the bottom meant to look like fluid. Add coolant to the system as soon as possible.

The symbol to the left, also featuring a wavy line at the bottom, is the traditional Low Coolant symbol is use for decades for internal combustion engines. But, as of 2024, it may be found in Kia hybrid vehicles and would be displayed when the coolant used by the vehicle’s electrical inverter is low. Driving without sufficient amount of coolant for a prolonged period of time can cause serious problems with the vehicle’s electrical equipment.

Do not confuse the first symbol with the similar one to the right, which is a catalytic converter. Click here for more.

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Technology is always changing and what is current and accurate today may be literally out-of-date and inaccurate tomorrow.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