AutoCodes – Generic – P0B76

P0B76 Code - Hybrid Battery Voltage Sense 'L' Circuit Intermittent/Erratic

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: P0B76 indicates Hybrid Battery Voltage Sense 'L' Circuit Intermittent/Erratic.
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 1,339

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 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0B76 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 P0B76 - Hybrid Battery Voltage Sense 'L' Circuit Intermittent/Erratic - AutoCodes.com — P0B76 Code - Hybrid Battery Voltage Sense 'L' Circuit Intermittent/Erratic

What does this mean?

What are the Possible Causes of the DTC P0B76?

Faulty Battery smart unit
Faulty HV battery assembly

How to Fix the DTC P0B76?

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 P0B76 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 P0B76 Code

What does the OBDII code P0B76 mean?

P0B76 indicates an intermittent or erratic signal in the Hybrid Battery Voltage Sense 'L' circuit, which monitors the voltage levels of the hybrid battery.

What are the common symptoms of a P0B76 code?

Common symptoms include warning lights on the dashboard, reduced fuel efficiency, limited hybrid system performance, or the vehicle entering "limp mode."

What causes the P0B76 code to appear?

Possible causes include damaged or corroded wiring, a faulty battery voltage sensor, loose electrical connections, or issues within the hybrid battery itself.

How is the P0B76 code diagnosed?

A mechanic will use a scan tool to confirm the code, inspect wiring and connections in the voltage sensing circuit, and check the hybrid battery for irregularities.

Can I drive with a P0B76 code?

Driving with a P0B76 code is not recommended, as it may lead to further damage to the hybrid system or sudden performance issues.

How can I fix the P0B76 code?

Repairs may involve replacing damaged wiring, securing loose connections, replacing the battery voltage sensor, or addressing hybrid battery issues if necessary.

Do I need to replace the hybrid battery for a P0B76 code?

Not always. The issue could be related to wiring or sensor problems rather than the hybrid battery itself. A proper diagnosis is essential.

What tools are needed to troubleshoot a P0B76 code?

A scan tool capable of reading hybrid system codes, a multimeter for testing electrical circuits, and basic tools for inspecting wiring and connectors are typically required.

How much does it cost to fix a P0B76 code?

The repair cost varies depending on the root cause. Fixing wiring or connections may cost less, while sensor replacement or hybrid battery repairs could be more expensive.

Can a software update fix the P0B76 code?

In rare cases, a software update may resolve the issue if it is caused by a system calibration error. However, physical inspections should be performed first.