Guide To P0C7E OBD Error Code Solutions

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What are the symptoms for P0C7E error code? Is the battery smart unit malfunctioning? Then there is a high chance that the P0C7E error code is stored in your vehicle. The hybrid battery temperature sensor ‘G’ circuit low is commonly referred to the wiring issue in the vehicle. By using multiple sensors, the hybrid battery pack will observe the temperature of each battery cell. The P0C7E error will be set if at least one of the battery temperature sensors finds an unlikely temperature. If the failure of multiple sensors occurs, then the high voltage system will be disabled.

The battery temperature sensor is made available in 3 locations in the HV battery. Based on the changes in the HV battery temperature, the thermistor’s resistance that is built in each battery temperature sensor will vary. Higher the resistance of the thermistor, lower will be the temperature of the battery. On the other hand, if the resistance is low, the temperature will go high. The battery temperature sensor is utilized by the battery small unit to find the temperature of the HV battery. After this, the value that is noticed is sent to the power management control ECU. The power management control ECU will then operate the blower fan depending on the results of detection.

What causes this problem with the Hybrid Battery Temperature Sensor "G" Circuit Low?

• The hybrid battery thermistor might be defective.
• There might be an opening in the hybrid battery thermistor or the circuit might be shorted.
• The electrical connection of the hybrid battery thermistor circuit might appear to be weak.
• Battery smart unit might be malfunctioning.

1. Hybrid Battery Temperature Sensor - Illumination of the battery light can occur if the hybrid battery temperature sensor fails. It’s wise to replace the damaged hybrid battery temperature sensor quickly so that the engine functions normally.
2. Hybrid Battery Pack - If the hybrid battery pack is damaged, then you will notice a drop in the battery bars with no usage. Even at times, you will hear strange noises from the engine. This is an indication that the hybrid battery pack needs a quick replacement.
3. Engine Wiring Connectors - The engine wiring connectors might get easily eroded if the temperature is high. Changing the damaged engine wiring connectors is very important so as to avoid the P0C7E error in the vehicle.
4. Battery Temperature Sensors - The battery temperature sensor measures the temperature and sends the information to the charger to adjust the voltage. If the temperature is high, the battery temperature sensor will fail and will need a replacement to function normally.
5. Battery Assembly - Cranking of the engine will be the very first symptom that you will notice if the battery assembly is faulty. Replace the faulty battery assembly with a new one.
6. Battery Control Module - The battery control module monitors the power supply as well as the charging of the batteries. It is always best to replace your damaged battery control module so that the P0C7E error code can be avoided.
7. Battery Smart Unit - One easy way to avoid the P0C7E error code in your vehicle is to replace the faulty battery smart unit as it illuminates the MIL and causes further performance related issues.
8. Diesel Particulate Filter - If your DPF is faulty, it will send in too much fuel to the fuel mixture. Replacing the faulty DPF is one easy way to get rid of the P0C7E error code.
9. Engine Control Unit - The engine performance will be poor and there will be a drop in fuel economy if the ECU malfunctions. Replace it immediately.
10. Fuel Pump - Replacing your faulty fuel pump is always the best ideas as it will disturb the engine’s air-fuel ratio and cause performance related issues.
11. Ignition Switch - As you operate your engine, if your vehicle suddenly stalls, it indicates the failure of the ignition switch. Get it replaced as soon as possible to avoid further troubles.

It is vital to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P0C7E here:

Common Symptoms

• As the DPF restores, the light will remain the same or light erratically. The engine will be inactive as you accelerate.
• Defective PCM.
• The ECU will return to the ‘limp home mode’ if the DPF is not corrected, until and unless the situation is made clear.
• The fuel efficiency is reduced.

Want to correct the Trouble Code P0C7E? Read these points mentioned below:

• Replacing the faulty ECU.
• Damaged ignition switch must be replaced.
• The faulty fuel pump needs replacement.
• The malfunctioning battery smart unit must be changed.
• Changing the faulty hybrid battery thermistor.

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It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P0C7E code to be stored:

• As you try to start the engine, if you hear a clicking noise and if the engine does not crank, then it means that the battery is faulty like discharged or low battery or the battery cables are free or eroded.
• But if you hear the engine cranking noise as you start the vehicle, but if it fails to start, then there can be an issue with the ignition or fuel.
• Other issues where the engine fails to start can be a faulty starter motor relay, a blocked fuel filter, a damaged fuel pump or a faulty ignition switch.
• You must not change the component or parts with respect to P0C7E error code alone.
• For more information on the possible causes of the error, you can refer the vehicle service manual along with the essential testing.

Common Mistakes When Diagnosing The P0C7E Code

• Defective high voltage battery assembly.
• An issue with the electrical wires.
• Faulty high voltage battery interface control module.