Description of the P0515 fault code.
OBD2 Error Codes

P0515 Battery temperature sensor circuit malfunction

26.05.2022 /

P0515 – OBD-II Trouble Code Technical Description

Trouble code P0515 indicates a problem with the battery temperature sensor circuit.

What does the fault code mean P0515?

Trouble code P0515 indicates a problem in the battery temperature sensor circuit. This means that the engine control module (PCM) has detected abnormal voltage from the battery temperature sensor. If the battery temperature is too high or too low compared to the expected values ​​​​set by the manufacturer, the P0515 error code appears.

Fault code P0515.

Possible reasons

Some of the possible causes of the P0515 trouble code are:

  1. Defective or damaged battery temperature sensor.
  2. Poor electrical connection or open circuit in the battery temperature sensor circuit.
  3. Problems with the engine control module (PCM) that is receiving incorrect signals from the battery temperature sensor.
  4. Faults in the battery itself, such as insufficient charge or damage.

These are just general causes, and the specific cause may vary depending on the specific make and model of car.

What are the symptoms of a fault code? P0515?

Symptoms for a P0515 trouble code may vary depending on the specific system and how it responds to the fault, but some possible symptoms include:

  • Check Engine (Check Battery) indicator: The Check Engine or Check Battery indicator lights up on the instrument panel.
  • Poor performance: Engine performance problems may occur, such as poor idling, uneven revs, or poor accelerator pedal response.
  • Energy Loss: The vehicle may operate less efficiently, especially when starting up or when using power-consuming accessories.
  • Battery charging problems: There may be problems with charging the battery, which can lead to difficulty starting the engine or even completely draining the battery.
  • Deterioration in fuel economy: In some cases, the P0515 trouble code may cause increased fuel consumption due to improper operation of the engine management system.

These symptoms may occur to varying degrees and may not be obvious depending on the specific conditions and condition of the vehicle.

How to diagnose a fault code P0515?

To diagnose DTC P0515, the following steps are recommended:

  1. Check the indicators on the instrument panel: Check to see if the Check Engine or Check Battery indicators are illuminated on the instrument panel. If they are on, this indicates a problem with the battery temperature sensor circuit.
  2. Use a diagnostic scanner: Connect the diagnostic scanner to your vehicle's OBD-II port and read the error codes. Make sure the P0515 code is present and write it down for later analysis.
  3. Check battery voltage: Measure the battery voltage with a multimeter with the engine off. Normal voltage should be around 12 volts. If the voltage is too low or too high, it may indicate problems with the battery or charging system.
  4. Check the battery temperature sensor: Check the condition and correct connection of the battery temperature sensor. Make sure there is no damage to the wires or contacts, and that the sensor is in the correct location and not damaged.
  5. Check the temperature sensor circuit: Using a multimeter, check the temperature sensor circuit for a short or open. Make sure the signal wires are unbroken and well connected to the PCM.
  6. Check PCM: If all of the above steps fail to identify the problem, the PCM itself may be faulty. In this case, additional diagnostics or PCM replacement is required.

After completing these steps, it is recommended to clear the error code and see if it appears again after driving the car for a while. If the code appears again, further inspection and repair of the system may be required.

Diagnostic errors

When diagnosing DTC P0515, the following errors may occur:

  • Incorrect cause identification: The error may occur if you do not pay enough attention to check all possible causes, including the battery temperature sensor, wires, connections and PCM.
  • Problems with the temperature sensor: Incorrect interpretation of data from the temperature sensor or its incorrect functioning can lead to erroneous diagnosis.
  • Electrical circuit malfunction: An incorrect connection, short circuit or open circuit in the temperature sensor or its connection to the PCM may result in an incorrect diagnosis.
  • PCM problems: A malfunction of the PCM itself may cause an erroneous determination of the cause, since the PCM plays a key role in interpreting the data from the temperature sensor and deciding on the error.
  • Insufficient check: Failure to complete all necessary diagnostic steps, as well as insufficient testing of all system elements, can lead to potential problem areas being missed.

To avoid these errors, it is necessary to carefully and systematically check each element of the system, as well as pay attention to detail and follow all diagnostic recommendations.

How serious is the fault code? P0515?

Trouble code P0515 is not typically critical to driving safety, but it does indicate a potential problem with the battery temperature sensor circuit. Although not an immediate safety hazard, improper operation of this system can cause problems with battery charging and longevity.

For example, if the battery temperature sensor is reporting incorrect data, the PCM may not properly manage the charging process, which could result in the battery being overcharged or undercharged. This may shorten the battery life or cause it to fail.

Although the problem associated with the P0515 code is not an immediate safety concern, it is recommended that you take action to resolve this problem as soon as possible to avoid potential problems with the vehicle's power supply and ensure normal operation of the charging system.

What repair will help eliminate the code? P0515?

To resolve DTC P0515, perform the following repair steps:

  1. Checking the battery temperature sensor: First you need to check the battery temperature sensor itself. This may require checking it for damage, corrosion or poor connections.
  2. Checking the electrical circuit: Next, you should check the electrical circuit connecting the battery temperature sensor to the engine control module (PCM). This includes checking the wiring for breaks, shorts, or poor connections.
  3. Replacing the battery temperature sensor: If the battery temperature sensor or its electrical circuit is damaged or faulty, it should be replaced.
  4. Checking and updating software: Sometimes the cause of the problem may be related to the PCM software. In this case, it may be necessary to check and, if necessary, update the software.
  5. Additional diagnostics: If the above steps do not resolve the problem, you may need to perform a more detailed diagnosis using specialized vehicle equipment or contact a professional auto mechanic for further assistance.

It is also important to note that repairs must be carried out in accordance with the vehicle manufacturer's recommendations and using the appropriate instructions and tools.

What is P0515 Engine Code [Quick Guide]

P0515 – Brand-specific information

Trouble code P0515 can apply to various makes and models of vehicles, some of them are:

These are just a few examples and each manufacturer may have their own interpretation of fault codes. For accurate diagnosis and repair, it is recommended to contact a service center that specializes in a specific car brand.

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