AutoCodes – Generic – P0B94

P0B94 Code - Hybrid Battery Voltage Sense 'R' 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: P0B94 indicates Hybrid Battery Voltage Sense 'R' 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 1,628

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 P0B94 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 P0B94 - Hybrid Battery Voltage Sense 'R' Circuit Intermittent/Erratic - AutoCodes.com — P0B94 Code - Hybrid Battery Voltage Sense 'R' Circuit Intermittent/Erratic

What does this mean?

What are the Possible Causes of the DTC P0B94?

Faulty Battery smart unit
Faulty HV battery assembly

How to Fix the DTC P0B94?

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 P0B94 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 P0B94 Code

1. What are the common symptoms of OBDII code P0B94?

Common symptoms of code P0B94 include the hybrid battery not charging properly, decreased fuel efficiency, and the vehicle entering a reduced power mode.

2. What are the possible causes of OBDII code P0B94?

Possible causes of code P0B94 include a faulty hybrid battery voltage sensor, poor electrical connections, damaged wiring, or a malfunctioning hybrid battery control module.

3. How can I diagnose the Hybrid Battery Voltage Sense 'R' Circuit issue?

Diagnosing the issue involves using a scan tool to read the code, checking the hybrid battery voltage sensor for proper operation, inspecting the wiring for any damage, and testing the connections for continuity.

4. Can I still drive my vehicle with OBDII code P0B94?

It is not recommended to drive the vehicle with code P0B94 present, as it can lead to further damage to the hybrid system and potentially cause the vehicle to stall or lose power unexpectedly.

5. How do I repair OBDII code P0B94?

Repairing code P0B94 may involve replacing the faulty hybrid battery voltage sensor, repairing any damaged wiring, ensuring proper electrical connections, and clearing the code with a scan tool.

6. Is it safe to reset the code and continue driving without repairing the issue?

It is not advisable to reset the code without addressing the underlying problem, as it can lead to recurring issues and potential safety hazards while driving.

7. Can extreme weather conditions affect the occurrence of OBDII code P0B94?

Extreme temperatures can indeed impact the performance of hybrid batteries and sensors, potentially leading to intermittent or erratic readings that trigger code P0B94.

8. How long does it typically take to repair OBDII code P0B94?

The repair time for code P0B94 can vary depending on the extent of the issue, but it may take a few hours to a full day to diagnose, repair, and clear the code.

9. Are there any preventive maintenance tips to avoid OBDII code P0B94?

Regularly inspecting the hybrid system components, maintaining proper battery health, and addressing any warning signs promptly can help prevent issues that trigger code P0B94.

10. Can a DIY enthusiast fix OBDII code P0B94, or is professional help recommended?

While some aspects of diagnosing and repairing code P0B94 may be within reach of experienced DIY enthusiasts, it is generally recommended to seek professional help to ensure a thorough and accurate repair.