P0AC5 - OBD Trouble Code

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The trouble code P0AC5 can be explicated as Hybrid Battery Temperature Sensor “B” Circuit. Generally, the hybrid battery pack will use multiple sensors so that it can monitor the temperature of each battery cell. If an unlikely temperature is reported by at least one of the battery temperature sensors, then the P0AC5 error code will be set in the vehicle. The failure in multiple sensors will disable the high voltage system.

The battery temperature sensor is available in 3 places of the HV battery. Depending on the thermistor’s resistance, that is inbuilt in each and every battery temperature sensor, the resistance will change according to the changes in the HV battery temperature. Lower the battery temperature means, higher the resistance of the thermistor. Similarly, lower the resistance also means higher the temperature. The temperature of the HV battery is found by the battery smart unit with the help of battery temperature sensor which finally sends the identified value to the power management control ECU. Depending on this finding, the blower fan is then controlled by the power management control ECU where the blower fan will start functioning once the temperature of the HV battery rises above a particular level.

What causes this problem with the Hybrid Battery Temperature Sensor “B” Circuit?

• Imperfect HV battery assembly
• Issue of unbolted HV battery assembly harness
• Unacceptable electrical connection in the HV battery assembly circuit
• There can be distorted battery smart unit

1. Hybrid Drive Cooling Pump - Check for faults in the hybrid battery cooling pump and replace it, if required. If the cooling pump does not function properly, then the battery might not work to its full capacity and can cause serious performance issues.
2. Battery Temperature Sensor - Inspect for faulty battery temperature sensor as it may cause the battery to overheat and not work properly and cause serious physical damages to various starting and charging system components. Thus, replace faulty sensor now!
3. Hybrid Battery - The battery itself can be faulty and can be overheating, which can lead to faster discharge and slower charging, with risks of leakages and other damages to the vehicle. Thus, immediate replacement is advisable.
4. Engine Control Module - Want to know the most common reason behind the failure in the engine control module? Corrosion or damage because of moisture can cause ECM failure. Corrosion might enter the ECM through the wiring harness and moisture can enter by a failure in the seals in the ECM itself.
5. Car Battery - Faulty car battery can have the problem of overheating and fast discharging. Thus, it can affect the motor performance as well as damaged major components. Replace it immediately.
6. Powertrain Control Module - The PCM makes the engine and transmission work in tandem. Any issue with the powertrain control module will cause major problems with the efficient running of the vehicle.
7. Electronic Control Unit - If your vehicle fails to start for no apparent reason, this is also a good indicator that there can be some issues with the ECU. If you check the car battery, starter and other common electrical components, and the vehicle still does not start, a quirky electronic control unit should be the next logical thing to consider.
8. Inverter Cooler Pump - The inverter cooler pump can also be faulty and not respond to the PCM instructions. This means that even though the temperature sensor and the PCM are working properly, the cooler pump may not work and cause damage to the battery functions. Thus, replace it immediately.

It is essential 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 P0AC5 here:

Common Symptoms

• Illumination in the service engine soon light

If you wish to correct this fault code, then you have to follow certain steps. Correcting a problem needs your careful attention. Here are some ways with the help of which you will be able to correct the OBD Code P0AC5:

• The malfunctioning PCM should be repaired or replaced as per the need
• Carefully adjust the faults in the HV battery assembly harness
• The battery smart unit should be restored to working order
• Recondition the non-functioning HV battery assembly circuit
• Adjust the flawed HV battery assembly

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If you want to easily diagnose this trouble code, then you must follow the steps which are mentioned here as below:

• The mechanic or the technician will use a diagnostic scanner or code reader like DVOM to visually scan for the error codes in the vehicle.
• After performing a careful inspection, every of the stored codes and freeze frame data are retrieved as it can help down the way for further diagnosis process.
• Most often he has to inspect the Hybrid Battery Temperature Sensor “B” Circuit itself to see if they are faulty or damaged. Additional error codes that are stored in the vehicle are also addressed.
• The mechanic performs a continuity test between the PCM and solenoid to check the resistance.
• If the solenoid or the control modules are not faulty, he will then retune the code and test drive the vehicle.
• On test driving, if the P0AC5 code does not return soon, he will know that an erratic condition exits.
• But if the error returns instantaneously, he will check every component of the control module as well as the circuit like connectors, wires, harness, fuses etc for any possible fault.
• If any component is damaged, he will fix them right away.
• After performing this repair, he will inspect the Hybrid Battery Temperature Sensor “B” Circuit as well.
• If the level is below the manufacturer’s specification, it has to be refilled and if the fluid is murky or contaminated it needs to be replaced.
• Every time a repair work is carried out, make sure that the mechanic test drives the vehicle after every repair so that the diagnosis is successful. This can eventually help him to know as to where the error occurred.

Common Mistakes When Diagnosing The P0AC5 Code

• Quirks in the battery control module
• High voltage battery assembly might start failing
• Issues related with the high voltage control module