Error Code P0A05: What It Means & What To Do?

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What does motor electronics coolant pump ‘A’ control circuit/open mean? Why does P0A05 error occur? An overheating of the engine gives rise to the P0A05 error code. The motor electronics coolant pump belongs to the hybrid system. The careful monitoring and controlling of this motor electronics coolant pump is done by the powertrain control module. A failure of this pump will eventually result in storing of this P0A05 error code.

It is possible to identify the high voltage coolant temperature with the help of a coolant temperature sensor. This is clearly identified by the power management control ECU. The coolant temperature sensor is inbuilt in the inverter which has the converter assembly. The signals from the ECU which manages power will use this signal to see how efficiently the inverter cooling system works. At times, the inverter output will be restricted by the ECU so that overheating of the vehicle’s engine can be avoided.

What causes this problem with the Motor Electronics Coolant Pump 'A' Control Circuit/Open?

• The motor electronics coolant pump ‘A’ might be broken.
• The motor electronics coolant pump ‘A’ harness has a short circuit or you might see an opening in this component.
• Very poor electrical connection in the motor electronics coolant pump ‘A’ circuit.

1. Electronic Control Unit - Do you find the electronic control unit to be defective? Find the replacement for ECU at best prices from Parts Avatar.
2. Engine Coolant Temperature Sensor - P0A05 error can be avoided if the faulty engine coolant temperature sensor is replaced with a new one.
3. Variable Camshaft Timing Solenoid - The contaminated VCT solenoid has to be quickly replaced to avoid the P0A05 error.
4. Cylinder Head Gasket - Find the replacement for cylinder head gasket from Parts Avatar at best prices online to avoid the P0A05 error from getting stored
5. Powertrain Control Module - Are you looking to replace the faulty PCM? Find them at Parts Avatar at best prices online.
6. Engine Wires - Carefully check the engine wires for any damages. If they are damaged or broken replace them instantly.

If you are facing OBD error code P0A05, then there are significant common symptoms that can be felt or observed. We have worked out a list here to help you out in understanding this problem better.

Common Symptoms

• You will experience the engine overheating.

It is very important to fix the fault code P0A05. So here are some ways with which you can correct this issue:

• Changing the faulty VCT solenoid.
• The broken head gasket cylinder has to be fixed.
• Replacing the faulty or broken PCM/ engine wires.

To do all this, you will need a few high-quality auto parts such as electronic control unit, coolant temperature sensor, VCT solenoid, cylinder head gasket, powertrain control module, engine wires and so on. From where will you get them? From your local store? Well, why go there when you can order quality parts with us while sitting in the comfort of your home. So, just browse through our website and order your needed parts today.

If you want to easily diagnose this fault code, then all you have to do is to follow the steps which are mentioned below:

• The P0A05 diagnostic trouble code is not very difficult to diagnose or carry out.
• If this error code appears in your vehicle it is always best to have a qualified technician or mechanic to look at this error code, where he will use a scanner to find out the problem.
• If the mechanic is in checking for this trouble code, he will see that the vehicle’s engine is in good condition, without any polluted air inside the engine.
• Also, the mechanic will check the wiring harness, which is exactly near the intake manifold for any possible damages and repair them as required.
• Secondly, he will check pull over the cylinder head gasket to see it is broken or has any cracks and will replace them if it is found to be damaged.
• Also, the mechanic will test the VCT solenoid, if it is properly functioning.
• At times the VCT solenoid may be damaged or stuck with nearby component due to contamination. The mechanic will check for these issues and resolve them accordingly.
• As, an alternative, the vehicle specific service manual can also be checked to carry out this diagnostic process.
• If the mechanic finds, any other issues like lean running or if there is air inside the engine, then the mechanic will first fix these faults, before proceeding with the P0A05 diagnosis.
• Once every diagnosis is done, it is very important to retest the code and test drive the vehicle to see if the error codes, still have.

Common Mistakes When Diagnosing the P0A05 Code

• Broken powertrain control module.
• The electrical wires of your vehicle face problems.
• The coolant pump which has a high voltage might be damaged.