P0A3E Generator Inverter Overheating

P0A3E Possible Causes

  • Faulty transmission assembly
  • Faulty transmission control module
  • Vehicle driven beyond design specifications
  • Motor electronics cooling system issues

What Does It Mean?

How to Fix Code P0A3E

Check the “possible causes” listed above. Visually inspect related wiring harnesses and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

P0A3E Possible Symptoms

Engine light on (or service engine soon warning light)

P0A3E Meaning

Indicates that the motor generator inverter has experienced overheating of the 3 temperature sensors

P0A3F Drive Motor “A” Position Sensor Circuit

P0A3F Possible Causes

  • Faulty drive motor generator
  • Drive motor harness is open or shorted
  • Poor electrical connection in the drive motor generator circuit

What Does It Mean?

How to Fix Code P0A3F

Check the “possible causes” listed above. Visually inspect the related wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

P0A3F Possible Symptoms

Engine light on (or service engine soon warning light)

P0A3F Meaning

The drive motor position sensor is monitored by the engine control module. The engine control module monitors the angular position, speed, and direction of the drive motor generator rotor based on signals from the resolver-type position sensor. The position sensor contains a drive coil, two driven coils, and an irregularly shaped metal rotor. The metal rotor is mechanically attached to the drive motor-generator shaft. When the vehicle is turned on, the engine control module sends a 7V AC, 10 kHz excitation signal to the drive coil. The drive coil excitation signal creates a magnetic field surrounding the two driven coils and the irregularly shaped rotor. The engine control module then monitors the two driven coil circuits for a return signal. The position of the irregular metal rotor causes the magnetically induced return signals from the driven coils to vary in size and shape. Comparing the two signals from the driven coils allows the engine control module to determine the exact position, speed, and direction of the drive motor-generator rotor. The position sensor is a non-repairable part of the drive motor.

P0A40 Drive Motor “A” Position Sensor Circuit Range/Performance

P0A40 Possible Causes

  • Faulty drive motor generator
  • Drive motor harness is open or shorted
  • Poor electrical connection in drive motor generator circuit

What Does It Mean?

How to Fix Code P0A40

Check the “possible causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

P0A40 Possible Symptoms

Malfunction Indicator Light illuminated (or Service Engine Soon warning light)

P0A40 Meaning

The drive motor position sensor is monitored by the motor control module. The motor control module monitors the angular position, speed, and direction of the drive motor generator rotor based on signals from the resolver-type position sensor. The position sensor contains one drive coil, two driven coils, and an irregularly shaped metal rotor. The metal rotor is mechanically attached to the drive motor-generator shaft. When the vehicle is turned on, the motor control module delivers a 7V AC, 10 kHz excitation signal to the drive coil. The drive coil excitation signal creates a magnetic field surrounding the two driven coils and the irregularly shaped rotor. The motor control module then monitors the two driven coil circuits for a return signal. The position of the irregular metal rotor causes the magnetically induced return signals from the driven coils to vary in size and shape. A comparison of the two signals from the driven coils allows the motor control module to determine the exact position, speed, and direction of the drive motor-generator rotor. The position sensor is a non-repairable part of the drive motor.

P0A41 Drive Motor “A” Position Sensor Circuit Low

P0A41 Possible Causes

  • Faulty inverter with converter assembly
  • Faulty hybrid vehicle generator assembly
  • Faulty hybrid vehicle motor assembly
  • Wiring harness or connector

What Does It Mean?

How to Fix P0A41 Code

Check the “possible causes” listed above. Visually inspect the wiring harness and associated connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

P0A41 Possible Symptoms

Engine light on (or service engine soon warning light)

P0A41 Meaning

A resolver is a sensor used to detect the position of the magnetic poles of a motor-generator rotor. Knowledge of the pole position is essential to ensure precise control of MG2 and MG1.
Each resolver contains a stator with an excitation coil and 2 detection coils (S, C). The gap between the stator and rotor changes as the rotor rotates because the rotor is oval-shaped. An alternating current with a predetermined frequency flows through the excitation coil, and the S and C detection coils produce alternating currents according to the sensor rotor position.
The inverter with converter (MG ECU) detects the absolute position of the rotor based on the phases of the S and C detection coils and the heights of their waveforms. Additionally, the CPU calculates the amount of position change over a predetermined time period to use the resolver as a speed sensor.
The MG ECU monitors signals from the motor resolver and detects malfunctions.

P0A42 Drive Motor Position Sensor “A” Circuit

P0A42 Possible Causes

  • Faulty inverter with converter assembly
  • Faulty hybrid vehicle generator assembly
  • Faulty hybrid vehicle motor assembly
  • Cable harness or connector

What Does It Mean?

How to Fix Code P0A42

Check the “possible causes” listed above. Visually inspect the cable harness and associated connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

P0A42 Possible Symptoms

Check engine light on (or service engine soon warning light)

P0A42 Meaning

A resolver is a sensor used to detect the position of magnetic poles in a motor-generator rotor. Knowledge of pole position is essential for precise control of MG2 and MG1.
Each resolver contains a stator with an excitation coil and 2 detection coils (S, C). The gap between stator and rotor changes as the rotor rotates because the rotor is oval-shaped. Alternating current with a predetermined frequency flows through the excitation coil, and the S and C detection coils produce alternating currents according to the sensor rotor position.
The inverter with converter (MG ECU) detects the absolute rotor position based on the phases of the S and C detection coils and their waveform amplitudes. Additionally, the CPU calculates the amount of position change over a predetermined time period to use the resolver as a speed sensor.
The MG ECU monitors signals from the motor resolver and detects malfunctions.

P0A43 Drive Motor “A” Position Sensor Circuit Intermittent

Fault Code P0A43: Causes, Symptoms, and Solutions

The fault code P0A43 relates to a problem with the resolver (position sensor) of a hybrid motor or generator. This sensor is essential for accurately controlling the vehicle’s electrical components, such as the MG1 or MG2 motor-generator. Discover the possible causes, symptoms, and repair steps to resolve this error code.

Meaning of Code P0A43

The P0A43 code indicates a malfunction of the resolver, a sensor that measures the position of the rotor’s magnetic poles in a hybrid vehicle. This sensor sends signals to the inverter-converter (MG ECU) to:

  • Calculate the rotor’s speed and position.
  • Regulate the electric motor’s power.
  • Ensure synchronization between hybrid components.

If the resolver or its circuit fails, the hybrid system may experience performance disruptions or even enter a safety mode.

Symptoms of Code P0A43

  • 🚨 Check engine light on (or hybrid warning message).
  • 🚨 Reduced vehicle performance (limp mode).
  • 🚨 Inability to start or unexpected shutdown of the hybrid engine.
  • 🚨 Compromised energy regeneration (battery not charging).

Possible Causes of Code P0A43

  1. Faulty resolver: Damaged or dirty sensor.
  2. Inverter-converter issue: Internal electronic failure.
  3. Hybrid motor or generator failure: MG1/MG2 malfunction.
  4. Damaged wiring: Cut wires, corroded connectors, or short circuits.

Diagnosing and Repairing Code P0A43

Step 1: Inspect Wiring and Connectors

  • Locate the resolver (integrated into the hybrid motor/generator).
  • Check for frayed wires, corroded connectors, or bent pins. Clean or replace as needed.

Step 2: Test the Resolver

  • Using an oscilloscope or multimeter, measure the signals from the resolver’s S and C coils.
  • Compare the values with those specified by the manufacturer (e.g., Toyota, Honda).

Step 3: Check the Inverter-Converter

  • Diagnose the inverter-converter (MG ECU) with a specialized scan tool.
  • Look for related error codes (e.g., P0A80, P0A7F).

Step 4: Replace Faulty Components

If the resolver, inverter, or hybrid motor is faulty, replace it. This step often requires the intervention of a certified hybrid technician.

FAQ on Code P0A43

Q: Can you drive with a P0A43 code?
No, the vehicle may enter safety mode, limiting its power or stopping abruptly.

Q: Average repair cost?
Variable: from €200 (wiring) to €2000+ (inverter or hybrid motor replacement).

Q: Which models commonly have this issue?
Often reported on hybrids like the Toyota Prius, Lexus CT200h, or Honda Insight.

Conclusion

The error code P0A43 is critical for hybrid vehicles, as it affects the core of their electrical system. A thorough inspection of the wiring and resolver is essential, but the complexity of hybrid components often requires professional expertise. If you suspect a failure of the inverter or MG1/MG2 motor, consult a specialized garage to avoid costly damage.

P0A44 Drive Motor “A” Position Sensor Circuit Overspeed

P0A44 Possible Causes

  • Faulty inverter with converter assembly
  • Faulty hybrid vehicle generator assembly
  • Faulty hybrid vehicle motor assembly
  • Wiring harness or connector

What Does It Mean?

How to Fix Code P0A44

Check the “Possible Causes” listed above. Visually inspect the wiring harness and associated connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

P0A44 Possible Symptoms

Check engine light on (or service engine soon warning light)

P0A44 Meaning

A resolver is a sensor used to detect the position of magnetic poles in a motor-generator rotor. Knowledge of pole position is essential for precise control of MG2 and MG1.
Each resolver contains a stator with an excitation coil and 2 detection coils (S, C). The gap between stator and rotor changes as the rotor rotates because the rotor is oval-shaped. Alternating current with a predetermined frequency flows through the excitation coil, and the S and C detection coils produce alternating currents according to the sensor rotor position.
The inverter with converter (MG ECU) detects the absolute rotor position based on the phases of the S and C detection coils and their waveform amplitudes. Additionally, the CPU calculates the amount of position change over a predetermined duration to use the resolver as a speed sensor.
The MG ECU monitors signals from the motor resolver and detects malfunctions.

P0A45 Drive Motor Position Sensor “B” Circuit

P0A45 Possible Causes

  • Faulty drive motor generator
  • Drive motor harness is open or shorted
  • Poor electrical connection in drive motor generator circuit

What Does It Mean?

How to Fix Code P0A45

Check the “possible causes” listed above. Visually inspect the related wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

P0A45 Possible Symptoms

Illuminated engine light (or service engine soon warning light)

P0A45 Meaning

The drive motor generator position sensor is monitored by the engine control module. The engine control module monitors the angular position, speed, and direction of the drive motor generator rotor based on signals from the resolver-type position sensor. The position sensor contains one drive coil, two driven coils, and an irregularly shaped metal rotor. The metal rotor is mechanically attached to the drive motor-generator shaft. When the vehicle is turned on, the engine control module sends a 7V AC, 10 kHz excitation signal to the drive coil. The drive coil excitation signal creates a magnetic field surrounding the two driven coils and the irregularly shaped rotor. The engine control module then monitors the two driven coil circuits for a return signal. The position of the irregular metal rotor causes the magnetically induced return signals from the driven coils to vary in size and shape. Comparing the two signals from the driven coils allows the engine control module to determine the exact position, speed, and direction of the drive motor-generator rotor. The position sensor is a non-repairable part of the drive motor generator.

P0A46 Drive Motor “B” Position Sensor Circuit Range / Performance

P0A46 Possible Causes

  • Faulty drive motor generator
  • Drive motor harness is open or shorted
  • Poor electrical connection in the drive motor generator circuit

What Does It Mean?

How to Fix Code P0A46

Check the “Possible Causes” listed above. Visually inspect the related cable harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

P0A46 Possible Symptoms

Engine light on (or service engine soon warning light)

P0A46 Meaning

The drive motor generator position sensor is monitored by the engine control module. The engine control module monitors the angular position, speed, and direction of the drive motor generator rotor based on signals from the resolver-type position sensor. The position sensor contains a drive coil, two driven coils, and an irregularly shaped metal rotor. The metal rotor is mechanically attached to the drive motor-generator shaft. When the vehicle is turned on, the engine control module sends a 7V AC, 10 kHz excitation signal to the drive coil. The drive coil excitation signal creates a magnetic field surrounding the two driven coils and the irregularly shaped rotor. The engine control module then monitors the two driven coil circuits for a return signal. The position of the irregular metal rotor causes the magnetically induced return signals from the driven coils to vary in size and shape. Comparing the two signals from the driven coils allows the engine control module to determine the exact position, speed, and direction of the drive motor-generator rotor. The position sensor is a non-repairable part of the drive motor generator.

P0A47 Drive Motor “B” Position Sensor Circuit Low

P0A47 Possible Causes

  • Faulty inverter with converter assembly
  • Faulty hybrid vehicle generator assembly
  • Faulty hybrid vehicle motor assembly
  • Cable harness or connector

What Does It Mean?

How to Fix Code P0A47

Check the “possible causes” listed above. Visually inspect the cable harness and associated connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

P0A47 Possible Symptoms

Engine light on (or service engine soon warning light)

P0A47 Meaning

A resolver is a sensor used to detect the position of the magnetic poles of a motor-generator rotor. Knowledge of the pole positions is essential to ensure precise control of MG2 and MG1.
Each resolver contains a stator with an excitation coil and 2 detection coils (S, C). The gap between the stator and rotor changes as the rotor rotates because the rotor is oval-shaped. An alternating current with a predetermined frequency flows through the excitation coil, and the S and C detection coils produce alternating currents according to the sensor rotor position.
The inverter with converter (MG ECU) detects the absolute rotor position based on the phases of the S and C detection coils and the heights of their waveforms. Additionally, the CPU calculates the amount of position change over a predetermined time period to use the resolver as a speed sensor.
The MG ECU monitors signals from the motor resolver and detects malfunctions.