Engine-Codes - Lexus - P0A91 LEXUS

P0A91 LEXUS Code - Drive Motor 'B' Performance

- Code Popularity: 1,031 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents

|What are the Possible Causes of the P0A91 LEXUS Code?

  • Faulty Engine assembly
  • Faulty HV transaxle assembly (shaft or gear)
  • Faulty Transmission input damper
  • Wire harness or connector
  • HV control ECU

|How to Fix the P0A91 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 P0A91 LEXUS code?

Labor: 1.0

The cost to diagnose the P0A91 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 P0A91 LEXUS code possible symptoms?

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

|What Does the P0A91 LEXUS Code Mean?

The HV transaxle consists of a planetary gear unit, MG1 and MG2.
A gear unit uses the planetary gear to split engine output in accordance with a driving request during driving the vehicle or charging its internal HV battery.
The MG2 provides assistance to the engine output while increasing the drive force of the vehicle.
Furthermore, the MG2 effects regenerative braking by converting the energy (which is consumed in the form of heat during normal braking) into electrical energy and recovering it into the HV battery. Through regenerative braking, as well as decelerating the vehicle, the MG2 generates high-voltage electrical power which is used for the purpose of charging the HV battery.
The MG1 supplies electrical power, which is used for charging the HV battery or for driving the MG2. It also has a stepless transmission function to control the transaxle by regulating the amount of generation of electrical energy, which effectively varies the MG1 speed. In addition, the MG1 is used as a starter motor to start the engine.
The transmission input damper absorbs the shock that accompanies transmission of the drive force from the engine.

Drive Motor 'B' Performance

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