Error Code P0AA6: What It Means & What To Do?

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The trouble code P0AA6 can be described as Hybrid Battery Voltage System Isolation Fault. The high voltage system is secluded from the low voltage system and the vehicle's frame. If a lot of voltage would be detected on the low voltage side, then the code P0AA6 will set. The high voltage system might shut down. This would also give rise to the illumination of the check engine light.

There is a high voltage isolation monitor feature equipped in the automobiles. The main role of the high voltage isolation circuit is to examine the resistance between the high voltage positive and negative direct current (DC) bus and chassis ground. This test is only run by the battery energy control module when the ignition transitions from ON to OFF and the high voltage contactor relays have opened. There is an internal isolation sensor in the battery energy control module which would measure the resistance between the high voltage DC positive and negative bus and chassis ground. The battery energy control module would run an internal self-check of this sensor circuit. An AC signal would be sent by the battery energy control module over the DC bus and its amplitude would be monitored. A low amplitude or collapsed return signal would indicate a loss of resistance to chassis ground and a loss of isolation will be indicated by the hybrid powertrain control module 2. Because this diagnostic runs after system power down, the diagnostic status would not get reported until the next key cycle.

What causes this problem with the Hybrid Battery Voltage System Isolation Fault?

• There can be distorted hybrid/EV battery pack
• Hybrid/EV battery pack harness is open or small
• Hybrid/EV battery pack circuit might have inadequate electrical connection

1. Battery Temperature Sensor - Faulty temperature sensor will not be able to interpret the battery temperatures which can cause overheating and leakages inside the battery that can cause harm to various components and can be dangerous to driver’s safety also. Thus, replace it at first instance.
2. Battery Coolant Pump - Battery coolant pump plays a vital role in keeping the battery pack cool while operating and keeping it from overheating. Thus, check and replace faulty pump as it can be the reason for temperature sensor indicating out of bound readings.
3. Engine Control Module - It is not always the components, but the ECM that can also be faulty. It can cause misinterpretation of correct data thus leading to wrong operational decisions which will affect the transmission and overall engine performance. Thus, replace faulty module and reprogram it now!
4. Powertrain Control Module - Powertrain Control Module can also be faulty in rare cases and thus needs through checks for system and software errors. Thus, check and replace it, if required.
5. Hybrid Battery - If the battery is at fault, it can also be the reason for battery overheating, which can lead to temperature sensor going out of specification. Buy new hybrid battery now!
6. Car Battery & Cables - Most of the time the battery cables and connectors are at fault for a particular component not functioning properly. Thus, the battery cable and connector should be checked for and replace in time.
7. Diagnostic Tools - It is always advisable to use the correct tools and equipment while resolving any OBD code issue as even small mistakes can lead to wrong diagnosis. Thus, always take help from a professional who has the knowledge and experience to such tools in an efficient manner. Buy new quality diagnostic tools from us today!

We care for our customers and that’s why we can totally understand your problem. That’s the reason why we have listed out some major symptoms behind the flashing up of OBD Code P0AA6. They are mentioned here as follows:

Common Symptoms

• Check engine light can start flashing up
• High voltage system might not function properly
• Automobile will not charge

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 P0AA6:

• Repair or replace the quirky hybrid/EV battery pack
• Rehabilitate the defaults in the hybrid/EV battery pack harness
• The malfunctioning ECU should be repaired or replaced as per the need
• Carefully adjust the faults in the hybrid/EV battery pack circuit

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Do you wish to diagnose P0AA6 error code easily? Here are some steps which you should follow in order to diagnose this fault code:

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 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 hybrid battery.

If the hybrid battery or other related parts are not faulty, he will then retune the code and test drive the vehicle.

Now when the car is taken out for a test drive, if the P0AA6 code does not return soon, he will know that there is an existence of erratic condition.

Common Mistakes When Diagnosing The P0AA6 Code

• The coolant system might start leaking
• Non observance of the high voltage control module
• Some issues with the car wiring