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Symptoms of a Bad or Failing Battery Temperature Sensor

Battery Temperature Sensor

Usually, modern vehicles use battery temperature sensors on the charging systems. Because of advanced technologies, batteries are an essential part of newer cars.


Applying the proper charge voltage is critical for achieving optimum battery performance and longevity. The ideal charge voltage required by batteries changes with battery temperature. The battery temperature sensor allows the charge controller to adjust the charge voltage based on the actual battery temperature continuously. Temperature compensation of charge voltage assures that the battery receives the proper charge voltage as battery temperature changes during normal operation.


When the battery temperature is low, the system voltage is set high and will automatically decrease as the temperature increases. For this reason, when the battery temperature sensor fails, it can cause problems not only for the battery but the entire electrical system as well. Let’s look at some symptoms that can notify the driver that the battery temperature sensor failed and needs to be fixed.

1. Engine surging

One of the most common symptoms of a failing battery temperature sensor is an engine that surges during operation. The battery temperature sensor is set to control the system voltage, and if it fails, an incorrect signal from the temperature sensor will lead the engine to surge.

2. Low battery voltage

A low battery voltage can be another symptom of a failing battery temperature sensor. If the computer is receiving an incorrect signal from the battery temperature sensor, it can stop a proper charging and cause low voltage. The vehicle with a low voltage is hard to start, and may also cause other problems for the vehicle’s electrical system.

3. Warning light

If the battery temperature sensor fails, you will see on your dashboard a Battery Warning Light. If the system is affected in any way that causes the battery not to be charged, and it is picked up by the computer, it will illuminate the Battery Light. The Battery Light will also illuminate if the sensor is too hot, that will inform the driver before damage occurs to the battery.

The battery temperature sensors become so popular due to advanced technologies in the electrical systems of newer vehicles, and they play an essential role in a vehicle’s charging system. If you notice that your vehicle’s battery temperature sensor is failing, contact your trusted mechanic to diagnose the problem and to fix it.

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