P0A42 OBD Error Code: Problem & Solutions

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Are there any symptoms to identify the P0A42 error code? What is the diagnostic process? Are these questions popping in your mind? Here’s the solution. The high voltage system that malfunctions is referred as drive motor ‘A’ position sensor circuit high. The position of the internal component of the hybrid motor is used by the sensors of the hybrid control module. Any fault in the position sensor, will make the ECM module to store the P0A42 error code.

The location of the magnetic poles of a rotor of a motor generator is found with the help of a resolver which is a sensor. It is vital to know the exact position of the poles to ensure the exact control of MG1 and MG2. Stator is available for each resolver that has excitation coil as well as 2 detection coils (S, C). As the rotor keeps turning, the breaks between the stator and rotor will also change as the rotor is oval shaped. In agreement with the position of the sensor rotor, an alternating current with fixed frequency will flow through excitation coil, detection coils- S and C with output alternating currents. Inverter in combination with converter assembly determines the correct position of rotor and waveform’s height with respect to the phases of detection coils S and C. The amount of the change in place is analyzed by the CPU with fixed length of times, so that the resolver can be used as speed sensor. The malfunction is identified and the signal output from the motor resolver is monitored by the MG ECU.

What causes this problem with the Drive Motor "A" Position Sensor Circuit High?

• Malfunctioning of the inverter along with the converter assembly.
• The hybrid vehicle generator assembly might malfunction.
• The hybrid vehicle motor assembly might be broken.
• Problematic connectors or the engine harness.

1. Position Sensor - The Damaged Position Sensor Has to Be Replaced to Avoid the P0A42 Error Code.
2. Drive Coil - The Performance of Your Vehicle Will Be Normal Only When the Damaged Drive Coil Is Replaced with A New One.
3. Metallic Rotor - Get the Replacement for Your Faulty Metallic Rotors from Parts Avatar at Best Prices Online.
4. Motor Generator - Is the Motor Generator Faulty? Get the Replacement for Defective Motor Generator from Parts Avatar.
5. Converter Assembly - The Faulty Converter Assembly Needs Immediate Fixation for The Engine to Run Smoothly.
6. Generator Assembly - Is the Generator Assembly Damaged? Get the Replacement for Damaged Generator Assembly from Parts Avatar at Best Prices Online.
7. Motor Assembly - The Right Replacement for Your Faulty Motor Assembly Can Be Found at Parts Avatar at Best Prices.
8. Engine Wiring Connector - The Vehicle Will Function Normally Only If the Faulty Connector Is Replaced Immediately.

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 P0A42 here:

Common Symptoms

• The warning light of the service engine or the engine light might be flashing.

Have a look at some ways with which you can correct the P0A42 code:

• The converter assembly and generator assembly has to be changed.
• Replacing the faulty connectors.
• Repairing the damaged motor generator and motor assembly. 

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It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P0A42 code to be stored: 

• Initially the mechanic will use a scanner to check for the stored error code.
• He will now connect a scanner to the diagnostic port of the vehicle and recover the codes and freeze frame data.
• This is usually obtained as it can help him with further diagnostic process.
• Firstly the mechanic will check the position sensor as well as the drive coils. If there are any faults it will be repaired.
• If there are no errors then the components like metallic rotor, motor generator, generator assembly, etc will be visually checked and examined if there are any faults or stored error codes.
• If there are any errors, the mechanic will repair them immediately.
• As a final step the mechanic will inspect the connectors if it is broken or damaged. If it is broken, the mechanic will carry out the repair process.
• After every components are repaired and when the diagnosis process is properly done, the mechanic has to test drive your vehicle again see if the engine light turns on or if the error code still appears.
• This can help him to locate the area as to where the error occurred.

Common Mistakes When Diagnosing the P0A42 Code

A times the mechanics may wrongly perform some diagnosis, whereas the actual problem may lie with the wires, the high voltage motor and the high voltage control module which appears to be faulty.