Error Code P0AD9: What It Means & What To Do?

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The trouble code P0AD9 can be explained as Hybrid Battery Positive Contactor Control Circuit/Open. This diagnostic fault code is a generic powertrain code, which means that it would apply to the OBD-II equipped vehicles. The specific repair steps can vary as it depends upon the vehicle make and model. One thing which you must keep in mind that its symptoms as well as causes would surely vary as it depends upon a number of things. The Hybrid Battery Positive Contactor Control Circuit is being monitored by the hybrid control module. This trouble code would be set by the hybrid control module when the Hybrid Battery Positive Contactor Control Circuit would not be as per the specifications set by the manufacturer.

The high-voltage power supply circuit is connected and disconnected by the system main relays as per the requests from the HV control ECU. There is a total of 3 relays (1 for the negative side and 2 for the positive side) for ensuring a reliable operation. The SMR1 and SMR3 should be turned ON initially for the connection. Then after that the SMR2 would be turned ON and SMR1 would be turned OFF. This process would protect the circuit from the high-voltage surge current by allowing the limit current to flow via the resistor. Then SMR2 and SMR3 should be turned OFF in the same order for disconnecting. It is the HV control ECU which would inspect if the relays have turned OFF properly. The proper functioning of the SMRs (CON1, CON2 and CON3) is monitored by the HV control ECU to inspect the malfunctions.

What causes this problem with the Hybrid Battery Positive Contactor Control Circuit/Open?

• Imperfect system main relay
• Issue of unbolted system main relay harness
• Unacceptable electrical connection in the system main relay circuit
• There can be distorted HV control ECU

1. Engine Control Module - ECM faults are rare but can be a big problem as faulty ECM will cause wrong vehicle operations and can also result in wrong OBD codes getting stored in the system which can also cause misdiagnosis. Thus, replace faulty ECM components now!
2. Hybrid Battery - Flashing dash lights and engine lights is the first thing a driver may notice. If a deviation in the fuel economy is noticed it is likely due to a failure in the hybrid battery. This may ultimately lead to a fault being triggered in the entire system, requiring a major expensive and time-consuming repair. So, it is advised to get yours changed now from Parts Avatar.
3. 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.
4. Car Battery - The car battery can also be at fault and might have the problem of overcharging and fast discharging. This can cause increased temperatures and can also affect the functioning of various sensors like the speed sensor, temperature sensor and many more. Thus, replace faulty car battery today!
5. Battery Coolant Pump - The battery coolant pump maintains the battery temperatures and optimises the air flow to keep the battery running properly. It the coolant pump gets damaged, then all the components associated with the battery can get damaged and the vehicle may enter fail safe mode to avoid damages. Thus, timely replace faulty coolant pump.
6. Powertrain Control Module - Check for PCM error which might be due to circuit faults that might require complete replacement and reprogramming. Replace it now!
7. Diagnostic Tools - Buy quality diagnostic tools to check and diagnose OBD code P0AD9 error with the help of experienced mechanic. Visit us today!

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 P0AD9 here:

Common Symptoms

• Appearance of the service engine soon light
• The high voltage system might not operate properly

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:

• Rehabilitate the defaults in the system main relay harness
• Carefully adjust the faults in the battery smart unit
• The system main relay should be restored to working order
• Recondition the non-functioning system main relay circuit

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

• As an initial step the mechanic will carefully inspect the vehicle with the help of a scanner.
• After this, the technician will connect a scanner to the diagnostic code so that he can recover all the codes and freeze frame data.
• Note down this information as it can clearly help for further diagnosis.
• After careful inspection, he will reset the code and test drive your vehicle to check for reappearance of the codes.
• He will know that an intermittent condition persists, if the code does not return instantly.
• But if the error code returns quickly, the vehicle is test driven, and then he has to inspect the transmission fluid.
• If any of the Hybrid Battery Positive Contactor Control Circuit is damaged, the mechanic will replace them quickly.
• Most often, whenever the mechanic carries out any repair work, he will reset the code and test drive your car, to check if the codes return immediately. This can preferably help the mechanic to know what caused this error code in the vehicle.

Common Mistakes When Diagnosing The P0AD9 Code

• Non-performance of the battery control module
• Issues related to the high voltage battery assembly
• Quirks in the high voltage control module