Engine-Codes - Lexus - P0A77 LEXUS

P0A77 LEXUS Code - Generator Phase W Current High

- Code Popularity: 997 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents

|What are the Possible Causes of the P0A77 LEXUS Code?

  • Faulty Inverter With Converter Assembly
  • Inverter With Converter Assembly harness is open or shorted
  • Inverter With Converter Assembly circuit poor electrical connection

|How to Fix the P0A77 LEXUS 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 P0A77 LEXUS code?

Labor: 1.0

The cost to diagnose the P0A77 LEXUS 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.

|What are P0A77 LEXUS code possible symptoms?

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

|What Does the P0A77 LEXUS Code Mean?

The inverter converts the high-voltage direct current of the HV battery and the alternating current for the MG1/MG2. The inverter contains a three-phase bridge circuit, which consists of 6 power transistors each for the MG1 and the MG2, in order to convert the direct current and the three-phase alternating current.
The HV control ECU controls the actuation of the power transistors.
The inverter transmits information that is necessary for effecting control, such as the amperage and voltage, to the HV control ECU.
The motor inverter current sensors detect the amperage that flows through the V and W phase cables between the inverter and MG1/MG2. The inverter transmits information that is necessary for effecting control, such as the amperage and voltage, to the HV control ECU.
The HV control ECU monitors the inverter current sensors to detect a malfunction in the sensor system.

Generator Phase W Current High

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