P0AA3 OBD Error Code: Problem & Solutions

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The trouble code P0AA3 can be elucidated as Hybrid Battery Negative Contactor Circuit. 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 examine the defaults.

This trouble code is generic, which would mean that it can apply to all the vehicles which are equipped with the OBD-II or the vehicles which are made since 1996 up to the present. The specifications on the definition, the troubleshooting steps as well as repairs can always vary from one vehicle to another. The circuit to the high voltage battery is being monitored by the hybrid control module. This trouble code would be set by the hybrid control module when it won’t be able to control the circuit to the high voltage battery would not be as per the specifications set by the manufacturer.

What causes this problem with the Hybrid Battery Negative Contactor Circuit?

• Malfunctioning system main relay
• System main relay harness might be unlocked
• System main relay circuit might have bad electrical connection
• Unusable HV control ECU

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:

• You must fix the defective system main relay
• Rehabilitate the defaults in the system main relay harness
• The malfunctioning system main relay circuit should be repaired or replaced as per the need
• Recondition the non-functioning HV control ECU

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 ecu, battery relay, hv control ecu, battery relay harness, battery relay switch, hv battery, pcm car, ecm car and engine control 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:

Generally, it is expected that whenever the foot presses the brakes, the car will slow down and come to a stop. The hydraulic pressure aids the brake pedal while power is applied by the foot. The foot’ force brings together a piston and caliper along with the brake pads attached (bonded rough and heat resistance metal or ceramic) to put pressure on the rotor. This code P0AA3 is usually detected on vehicles that have electronically controlled automatic transmissions. The 3-4 shift solenoid holds the responsibility for activating the hydraulic circuits to actuate the clutches or bands that further change the gears present inside the automatic transmission.

Common Mistakes When Diagnosing The P0AA3 Code

• High voltage control module might start failing
• Issues with the car wiring