AutoCodes – Generic – P0A4B

P0A4B Code - Generator Position Sensor Circuit

Quick Answer

A resolver is a sensor that detects the position of the magnetic poles, which are indispensable for ensuring highly efficient control of MG2 and MG1. Common causes include Faulty Hybrid Vehicle Transaxle Assembly (Generator Resolver), Hybrid Vehicle Transaxle Assembly harness is open or shorted, Hybrid Vehicle Transaxle 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: P0A4B indicates Generator Position Sensor Circuit.
Common causes: Common causes include Faulty Hybrid Vehicle Transaxle Assembly (Generator Resolver), Hybrid Vehicle Transaxle Assembly harness is open or shorted, Hybrid Vehicle Transaxle 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 14,594

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 Jan 29, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P0A4B Description

A resolver is a sensor that detects the position of the magnetic poles, which are indispensable for ensuring highly efficient control of MG2 and MG1.
The generator resolver structure and method of connection with the inverter with converter assembly are the same as those of the motor resolver.
The inverter with converter assembly monitors output signals from the generator resolver and detects malfunctions.

OBDII Code P0A4B - Generator Position Sensor Circuit - AutoCodes.com — P0A4B Code - Generator Position Sensor Circuit

What does this mean?

What are the Possible Causes of the DTC P0A4B?

Faulty Hybrid Vehicle Transaxle Assembly (Generator Resolver)
Hybrid Vehicle Transaxle Assembly harness is open or shorted
Hybrid Vehicle Transaxle Assembly circuit poor electrical connection
Inverter with Converter Assembly

How to Fix the DTC P0A4B?

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 P0A4B 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 P0A4B code?

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Need Help with the Code?

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Information for Specific Makes

P0A4B Lexus — Generator Position Sensor Circuit
P0A4B Toyota — Generator Position Sensor Circuit

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.