AutoCodes – Lexus – P0A39 Lexus

P0A39 Lexus Code - Generator Temperature Sensor Circuit High

Quick Answer

The motor temperature sensor No. Common causes include Faulty Hybrid Vehicle Motor, Hybrid Vehicle Motor harness is open or shorted, Hybrid Vehicle Motor 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: P0A39 Lexus indicates Generator Temperature Sensor Circuit High.
Common causes: Common causes include Faulty Hybrid Vehicle Motor, Hybrid Vehicle Motor harness is open or shorted, Hybrid Vehicle Motor 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 2,580

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 May 11, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P0A39 Lexus Description

The motor temperature sensor No. 2 detects the temperature of the transaxle fluid. The resistance of the thermistor installed in the motor temperature sensor No. 2 varies with the changes in the transaxle fluid temperature. The construction in the motor temperature sensor No. 2 and how it is connected to the HV control ECU are the same as those of the motor temperature sensor No. 1.
Based on the signal provided by the motor temperature sensor No. 2, the HV control ECU limits the load to prevent the motor from overheating. Furthermore, the HV control ECU checks the motor temperature sensor No. 2 for a wiring malfunction and the sensor for malfunction.

OBDII Code P0A39 Lexus - Generator Temperature Sensor Circuit High - AutoCodes.com — P0A39 Lexus Code - Generator Temperature Sensor Circuit High

What does this mean?

What are the Possible Causes of the DTC P0A39 Lexus?

Faulty Hybrid Vehicle Motor
Hybrid Vehicle Motor harness is open or shorted
Hybrid Vehicle Motor circuit poor electrical connection

How to Fix the DTC P0A39 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 P0A39 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.

Need more information about the P0A39 Lexus code?

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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.