P0AC0 OBD Error Code: Problem & Solutions

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The trouble code P0AC0 can be elucidated as Hybrid Battery Pack Current Sensor "A" Circuit Range/Performance. There is a current sensor mounted to the negative battery cable in the high voltage battery pack. This sensor would inform the battery control module if the battery pack is being charged or discharged. Now if a malfunction would be detected by the battery control module in the Hybrid Battery Pack Current Sensor "A" Circuit, then it would set the P0AC0 fault code.

The battery current sensor is mounted on the positive cable side of the HV battery assembly which would detect the amperage that would flow into the HV battery. The battery smart unit would input a voltage which varies between 0 and 5 V in proportion to the amperage, into the IB terminal from the battery current sensor. If there is an output voltage of the battery current sensor that is below 2.5 V, then it would indicate that the HV battery is being discharged, and when it would be above 2.5 V, then it would indicate that the HV battery is being charged.

What causes this problem with the Hybrid Battery Pack Current Sensor "A" Circuit Range/Performance?

• Malfunctioning battery smart unit
• Battery smart unit harness might be unlocked
• Battery smart unit circuit might have bad electrical connection
• Unusable hybrid battery junction block

1. Engine Control Module - Dead cells in batteries can cause a failure in the engine control module. Many times, a battery is left in the rig long after a cell has died. This would affect the grounding in the car battery.
2. Powertrain Control Module - If there are some faults in the PCM, then it may throw off the timing and fuel settings of the engine, which can negatively affect the performance. A flawed PCM may cause the vehicle to experience a reduction in fuel efficiency, power as well as acceleration. Buy high grade PCM online from us.
3. Electronic Control Unit - Do you know that the poor performance or unexplained drops in fuel economy or efficiency are often associated to onboard car computer problems, or defective ECU issues? It's better to replace it with a brand new one.
4. Hybrid Battery - Whenever the hybrid battery fails, one is likely to experience a fall in the MPG. Apart from this, a failure in the hybrid battery is likely to trigger symptoms that may lead to an unusual MPG. in addition to these the driver is likely to observe a high mileage. So, in order to prevent expensive repairs, we recommend you to change the hybrid battery right away from Parts Avatar.
5. Battery Coolant Pump - Even if the temperature sensor is working properly, the battery coolant pump can be at fault and may need replacement. If the pump is not responding to the PCM requests, then the malfunctioned pump can cause overheating of the battery which in turn can affect the vehicle performance.
6. Coolant Hoses/Pipes - Damaged hoses and pipes can cause leakages and thus reduce the effectiveness of the cooling system. Thus, cracked and damaged pipes must be replaced immediately.
7. Cooling System - There can be many components in the cooling system that can be faulty, causing battery overheating and underperforming. So, replace the faulty components immediately.
8. Battery Temperature Sensor - If the temperature sensor is faulty, the ECU will not be able to calculate the battery temperatures and the battery can overheat or run cold. Thus, it is important that the temperature sensors work properly so that the ECU can control the blower fan to manage the temperatures. Buy new battery temperature sensors form us.

You might be thinking that how would you diagnose these problems? We at Parts Avatar Canada would help you diagnose the major symptoms easily.

Common Symptoms

• Visibility in the check engine light

 Looking out for some ways with the help of which you can correct this fault code? Then you have arrived at the correct place. We are here to help you out, so you must check out the steps mentioned below as follows:

• The malfunctioning battery smart unit circuit should be repaired or replaced as per the need
• You must fix the defective battery smart unit
• Rehabilitate the defaults in the battery smart unit harness
• Recondition the non-functioning hybrid battery junction block

There is no need to get strained if your OBD Code is still flashing up as we are here at your service. Have a look at our superior variety of HV battery temperature sensor, HV battery assembly, battery smart unit, HV battery assembly harness, hv battery, pcm, ecm, ecu, pcm module, ecm module and many more. Now all your problems would vanish within no time.

Here are some steps which you should follow in order to diagnose this fault code:

• This is a general type of error code which is diagnosed with the help of a scanner.
• The mechanic will insert a scanner to diagnostic port of the vehicle and recover the codes and freeze frame data.
• If he happens to find any additional error codes, he has to address them as well.
• Once it is done, he has to reset the vehicle, and then test drive to see if the error code appears.
• If the error code does not return, then there can be an erratic condition.
• Then the mechanic has to check the wires, connectors and other electrical components and quickly replace them if he finds them to be damaged or defective.
• Check for the damaged hybrid battery pack current sensor "A" circuit and its components for error. It the mechanic finds the fault in the connectors in relation to the hybrid battery pack current sensor "A" circuit, replace it immediately.
• Also check for the particular battery cells emitting high voltages and thus might need battery replacement as well.
• Parts or components should not be replaced with reference to only a P0AC0 DTC. The vehicle service manual should be consulted for more information on possible causes of the fault, along with required testing.
• If all the components seem to work perfectly, inspect the PCM for faults and replacement along with reprogramming.

Common Mistakes When Diagnosing The P0AC0 Code

• Battery control module might start failing
• Flaws in the battery current sensor
• Issues with the high voltage battery assembly