P0A90 Code - Drive Motor 'A' Performance
Quick Answer
The HV transaxle consists of a planetary gear unit, MG1 and MG2. Common causes include Faulty Engine assembly, Faulty HV transaxle assembly (shaft or gear), Faulty Transmission input damper. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0A90 indicates Drive Motor 'A' Performance.
- Common causes
- Common causes include Faulty Engine assembly, Faulty HV transaxle assembly (shaft or gear), Faulty Transmission input damper.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0A90 Description
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.
What are the Possible Causes of the DTC P0A90?
- 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 DTC P0A90?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0A90 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Information for Specific Makes
- P0A90 Buick — Drive Motor Performance
- P0A90 Cadillac — Drive Motor Performance
- P0A90 Chevrolet — Drive Motor Performance
- P0A90 GMC — Drive Motor Performance
- P0A90 Lexus — Drive Motor 'A' Performance
- P0A90 Nissan — Drive Motor 'A' Performance
- P0A90 Toyota — Drive Motor 'A' Performance
Frequently Asked Questions about P0A90 Code
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