AutoCodes – Lexus – P0B47 Lexus

P0B47 Lexus Code - Hybrid Battery Voltage Sense 'C' Circuit Low

Quick Answer

The HV battery uses nickel metal-hydride batteries and does not require external charging. Common causes include Faulty Battery smart unit, Faulty HV battery assembly. 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: P0B47 Lexus indicates Hybrid Battery Voltage Sense 'C' Circuit Low.
Common causes: Common causes include Faulty Battery smart unit, Faulty HV battery assembly.
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 3,216

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 Mar 07, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0B47 Lexus Description

The HV battery uses nickel metal-hydride batteries and does not require external charging. The power management control ECU controls the SOC (state of charge) of the HV battery at a constant level during driving. The HV battery is composed of 28 modules, and each module consists of eight 1.2 V cells in series. The battery smart unit monitors battery block voltage at 14 locations. Each battery block is composed of 2 modules in a set. The battery smart unit, which monitors the voltage of the battery blocks, determines that malfunction has occurred if a voltage difference between the battery blocks exceeds the standard. When the malfunction detection condition is satisfied, the power management control ECU (HV CPU) will illuminates the Malfunction Indicator Lamp (MIL) and set a Diagnostic Trouble Code (DTC).

OBDII Code P0B47 Lexus - Hybrid Battery Voltage Sense 'C' Circuit Low - AutoCodes.com — P0B47 Lexus Code - Hybrid Battery Voltage Sense 'C' Circuit Low

What does this mean?

What are the Possible Causes of the DTC P0B47 Lexus?

Faulty Battery smart unit
Faulty HV battery assembly

How to Fix the DTC P0B47 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 P0B47 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.

Frequently Asked Questions about P0B47 Lexus Code

What does the OBDII code P0B47 mean in a Lexus?

Code P0B47 indicates a problem with the Hybrid Battery Voltage Sense 'C' Circuit, specifically that the voltage is lower than expected.

What are common symptoms of code P0B47 in a Lexus?

Symptoms may include warning lights on the dashboard, reduced fuel efficiency, limited hybrid system performance, or the vehicle entering a limp mode.

What causes the P0B47 code in a Lexus hybrid?

Potential causes include a faulty hybrid battery voltage sensor, wiring issues, corroded or damaged connectors, or a malfunctioning hybrid battery module.

Can driving with code P0B47 damage my Lexus?

Driving with this code can stress the hybrid system and potentially lead to further damage. It’s best to address the issue promptly.

How is code P0B47 diagnosed in a Lexus?

Technicians typically use an OBD-II scanner, inspect the hybrid battery voltage sensor and related wiring, and may test the hybrid battery modules for irregularities.

Can a faulty hybrid battery trigger code P0B47?

Yes, if the hybrid battery module is failing or has voltage imbalances, it can cause the Hybrid Battery Voltage Sense 'C' Circuit to read incorrectly.

What repairs are needed for code P0B47 in a Lexus?

Repairs may involve replacing the hybrid battery voltage sensor, repairing or replacing damaged wiring, or even replacing the hybrid battery if necessary.

How much does it cost to fix a P0B47 code in a Lexus?

Costs can vary widely depending on the issue, ranging from $100-$300 for sensor or wiring repairs to over $2,000 if the hybrid battery needs replacement.

Can I reset the P0B47 code without fixing the issue?

While you can clear the code with an OBD-II scanner, it will likely return if the underlying issue isn’t resolved.

Is code P0B47 common in Lexus hybrid vehicles?

It’s not extremely common but can occur in aging vehicles or those with wear in the hybrid battery system or wiring. Regular maintenance can help prevent it.