Engine-Codes - Generic - P0A42

P0A42 Code - Drive Motor 'A' Position Sensor Circuit High

- Code Popularity: 5,172 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents

|What are the Possible Causes of the Code P0A42?

  • Faulty Inverter with converter assembly
  • Faulty Hybrid vehicle generator assembly
  • Faulty Hybrid vehicle motor assembly
  • Wire harness or connector

|How to Fix the P0A42 Code?

Start by checking 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's pins.

|What is the Cost to Diagnose the Code P0A42?

Labor: 1.0

The cost to diagnose the P0A42 code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

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|What are Code P0A42 Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

|What Does the P0A42 Code Mean?

A resolver is a sensor that is used to detect the position of the magnetic poles the rotor of a motor generator. Knowing the position of the poles is indispensable for ensuring precise control of MG2 and MG1.
Each resolver contains a stator that has an excitation coil and 2 detection coils (S, C). The gap between the stator and rotor changes as the rotor turns because the rotor is oval shaped. An alternating current with a predetermined frequency flows through the excitation coil, and detection coils S and C output alternating currents in accordance with the sensor rotor position.
The inverter with converter assembly (MG ECU) detects the absolute position of the rotor according to the phases of detection coils S and C and the heights of their waveforms. Furthermore, the CPU calculates the amount of change in the position within a predetermined length of time, in order to use the resolver as a speed sensor.
The MG ECU monitors signals output from the motor resolver and detects malfunctions.

Drive Motor 'A' Position Sensor Circuit High

|Need more Information on the P0A42 Code?

Need more information on how to fix the P0A42 code? Get Access to Factory Service Manuals

|Code P0A42 Information for Specific Makes

  • P0A42 Lexus Drive Motor 'A' Position Sensor Circuit High
  • P0A42 Toyota Drive Motor 'A' Position Sensor Circuit High

|Need Help with the P0A42 Code?

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