AutoCodes – Lexus – P0AFA Lexus

P0AFA Lexus Code - Hybrid Battery System Voltage Low

Quick Answer

The Battery Smart Unit monitors the voltage of the battery blocks to detect an open malfunction in the internal battery voltage sensor circuits of the Battery Smart Unit and the wire harness between each battery block and Battery Smart Unit. Common causes include Faulty Battery Smart Unit, Battery Smart Unit harness is open or shorted, Battery Smart Unit 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: P0AFA Lexus indicates Hybrid Battery System Voltage Low.
Common causes: Common causes include Faulty Battery Smart Unit, Battery Smart Unit harness is open or shorted, Battery Smart Unit 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 298

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 20, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P0AFA Lexus Description

The Battery Smart Unit monitors the voltage of the battery blocks to detect an open malfunction in the internal battery voltage sensor circuits of the Battery Smart Unit and the wire harness between each battery block and Battery Smart Unit. If a voltage at one of the battery blocks is below a standard level or of all the battery blocks is within a specified range, the Battery Smart Unit judges that there is an open in the internal sensor circuit(s) or wire harness. The Hybrid Vehicle (HV) Control ECU then illuminates the MIL and sets a Diagnostic Trouble Code (DTC).

OBDII Code P0AFA Lexus - Hybrid Battery System Voltage Low - AutoCodes.com — P0AFA Lexus Code - Hybrid Battery System Voltage Low

What does this mean?

What are the Possible Causes of the DTC P0AFA Lexus?

Faulty Battery Smart Unit
Battery Smart Unit harness is open or shorted
Battery Smart Unit circuit poor electrical connection
Faulty Hybrid Vehicle (HV) Battery

How to Fix the DTC P0AFA 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 P0AFA 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 P0AFA 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.