AutoCodes – Lexus – P0AF0 Lexus

P0AF0 Lexus Code - Drive Motor Inverter Temperature Sensor 'A' Circuit High

Quick Answer

The HV control ECU uses a temperature sensor, which is built into the inverter, to detect the temperature of the motor inverter. Common causes include Faulty Inverter With Converter Assembly, Inverter With Converter Assembly harness is open or shorted, Inverter With Converter Assembly circuit poor electrical connection. 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: P0AF0 Lexus indicates Drive Motor Inverter Temperature Sensor 'A' Circuit High.
Common causes: Common causes include Faulty Inverter With Converter Assembly, Inverter With Converter Assembly harness is open or shorted, Inverter With Converter Assembly circuit poor electrical connection.
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.

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Code Popularity 1,274

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Oct 16, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
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Code P0AF0 Lexus Description

The HV control ECU uses a temperature sensor, which is built into the inverter, to detect the temperature of the motor inverter. The same cooling system that is routed to the MG1 and MG2 cools the inverter. This cooling system is independent from the engine cooling system.
The characteristic of the motor inverter temperature sensor is the same as the boost converter temperature sensor.
The HV control ECU limits the load based on the signals transmitted by the motor inverter temperature sensor, in order to check the effectiveness of the inverter cooling system and prevent the inverter from overheating. Furthermore, the HV control ECU detects a malfunction in the wiring of the motor inverter temperature sensor, as well as in the sensor itself.

OBDII Code P0AF0 Lexus - Drive Motor Inverter Temperature Sensor 'A' Circuit High - AutoCodes.com — P0AF0 Lexus Code - Drive Motor Inverter Temperature Sensor 'A' Circuit High

What does this mean?

What are the Possible Causes of the DTC P0AF0 Lexus?

Faulty Inverter With Converter Assembly
Inverter With Converter Assembly harness is open or shorted
Inverter With Converter Assembly circuit poor electrical connection
Faulty HV Control ECU

How to Fix the DTC P0AF0 Lexus?

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 P0AF0 Lexus 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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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.