AutoCodes – Nissan – P0B51 Nissan

P0B51 Nissan Code - Hybrid Battery Voltage Sense 'E' 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: P0B51 Nissan indicates Hybrid Battery Voltage Sense 'E' 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 1,377

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 P0B51 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 P0B51 Nissan - Hybrid Battery Voltage Sense 'E' Circuit Low - AutoCodes.com — P0B51 Nissan Code - Hybrid Battery Voltage Sense 'E' Circuit Low

What does this mean?

What are the Possible Causes of the DTC P0B51 Nissan?

Faulty Battery smart unit
Faulty HV battery assembly

How to Fix the DTC P0B51 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 P0B51 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 P0B51 Nissan Code

1. What are the common symptoms of OBDII code P0B51 on a Nissan related to the Hybrid Battery Voltage Sense 'E' Circuit Low?

- Common symptoms may include reduced hybrid system performance, a decrease in fuel efficiency, and a possible illuminated warning light on the dashboard.

2. What are some possible causes of the Hybrid Battery Voltage Sense 'E' Circuit Low error code on a Nissan vehicle?

- Causes can 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 'E' Circuit Low issue on my Nissan?

- Diagnosis typically involves using an OBDII scanner to retrieve the specific error code, inspecting the hybrid battery voltage sensor and related components, and testing the voltage sense circuit for continuity and proper functioning.

4. Can driving with the P0B51 code present cause any further damage to my Nissan's hybrid system?

- Continuing to drive with the Hybrid Battery Voltage Sense 'E' Circuit Low code may lead to reduced hybrid system efficiency and potential long-term damage to the hybrid battery, so it is recommended to address the issue promptly.

5. What are some tips for repairing the Hybrid Battery Voltage Sense 'E' Circuit Low problem on a Nissan?

- Repair options may include replacing the faulty hybrid battery voltage sensor, repairing any damaged wiring or connectors, or addressing any other underlying issues affecting the voltage sense circuit.

6. Is it safe to reset the OBDII code P0B51 on my Nissan without addressing the root cause?

- While clearing the error code may temporarily remove the warning light, it is crucial to address the underlying issue causing the Hybrid Battery Voltage Sense 'E' Circuit Low to prevent potential future problems with the hybrid system.

7. Can a DIY enthusiast fix the Hybrid Battery Voltage Sense 'E' Circuit Low issue on a Nissan, or is professional assistance required?

- Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to diagnose and repair the issue themselves, but seeking professional assistance is recommended for complex electrical system repairs.

8. How much can I expect to pay for repairing the Hybrid Battery Voltage Sense 'E' Circuit Low issue on my Nissan at a dealership or repair shop?

- Repair costs can vary based on the specific cause of the problem, but expect to pay for diagnostic fees, replacement parts, and labor, with total expenses potentially ranging from a few hundred to over a thousand dollars.

9. Will fixing the Hybrid Battery Voltage Sense 'E' Circuit Low code improve the overall performance and fuel efficiency of my Nissan hybrid vehicle?

- Yes, addressing the P0B51 code and resolving the underlying voltage sense circuit issue should help restore optimal hybrid system performance and fuel efficiency in your Nissan.

10. Are there any preventative maintenance steps I can take to avoid encountering the Hybrid Battery Voltage Sense 'E' Circuit Low problem in the future?

- Regularly inspecting the hybrid system components, ensuring proper maintenance of the hybrid battery, and addressing any warning lights or unusual symptoms promptly can help prevent issues like the P0B51 code from occurring.