AutoCodes – Nissan – P0B42 Nissan

P0B42 Nissan Code - Hybrid Battery Voltage Sense 'B' 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: P0B42 Nissan indicates Hybrid Battery Voltage Sense 'B' 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 1,397

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 P0B42 Nissan 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 P0B42 Nissan - Hybrid Battery Voltage Sense 'B' Circuit Low - AutoCodes.com — P0B42 Nissan Code - Hybrid Battery Voltage Sense 'B' Circuit Low

What does this mean?

What are the Possible Causes of the DTC P0B42 Nissan?

Faulty Battery smart unit
Faulty HV battery assembly

How to Fix the DTC P0B42 Nissan?

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 P0B42 Nissan 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 P0B42 Nissan Code

1. What are the common symptoms of OBDII code P0B42 in a Nissan related to the Hybrid Battery Voltage Sense 'B' Circuit Low?

- Common symptoms include reduced hybrid system performance, decreased fuel efficiency, and potential illumination of the hybrid system warning light.

2. What are the possible causes of the Hybrid Battery Voltage Sense 'B' Circuit Low code (P0B42) in a Nissan?

- Possible causes may include a faulty hybrid battery voltage sensor, damaged wiring or connectors in the voltage sense circuit, or issues with the hybrid battery itself.

3. How can I diagnose the Hybrid Battery Voltage Sense 'B' Circuit Low issue in my Nissan?

- Diagnosis typically involves using an OBDII scanner to retrieve the specific trouble code (P0B42), checking the hybrid battery voltage sensor and its connections, and inspecting the wiring for any visible damage.

4. Is it safe to continue driving my Nissan with the P0B42 code related to the Hybrid Battery Voltage Sense 'B' Circuit Low?

- It is not recommended to continue driving the vehicle with this code present, as it can lead to further damage to the hybrid system components and potentially result in a loss of hybrid functionality.

5. How can I repair the Hybrid Battery Voltage Sense 'B' Circuit Low issue in my Nissan?

- Repair steps may include replacing the faulty hybrid battery voltage sensor, repairing or replacing damaged wiring or connectors, and clearing the trouble code with an OBDII scanner.

6. Can I fix the P0B42 code related to the Hybrid Battery Voltage Sense 'B' Circuit Low in my Nissan myself, or do I need professional help?

- Depending on your experience and knowledge of hybrid systems, you may be able to address the issue yourself by following repair guides and using the necessary tools. However, seeking professional help is recommended for complex electrical issues.

7. Will resetting the OBDII code P0B42 related to the Hybrid Battery Voltage Sense 'B' Circuit Low make it go away permanently?

- Resetting the code without addressing the underlying issue will not fix the problem permanently. It is essential to diagnose and repair the root cause to prevent the code from reoccurring.

8. Are there any maintenance tips to prevent the occurrence of the Hybrid Battery Voltage Sense 'B' Circuit Low code in my Nissan?

- Regularly inspecting the hybrid battery components, including the voltage sensor and wiring, as part of routine maintenance can help identify potential issues early and prevent the code from appearing.

9. Can extreme weather conditions affect the likelihood of the P0B42 code related to the Hybrid Battery Voltage Sense 'B' Circuit Low in a Nissan?

- Extreme temperatures, both hot and cold, can sometimes impact the performance of hybrid batteries and sensors, potentially leading to the triggering of the P0B42 trouble code.

10. Is the Hybrid Battery Voltage Sense 'B' Circuit Low issue specific to Nissan vehicles, or can it occur in other hybrid models as well?

- While the specific trouble code P0B42 may be unique to Nissan vehicles, issues related to hybrid battery voltage sensing circuits can occur in other hybrid models, albeit with different diagnostic codes.