AutoCodes – Chevrolet – P0B51 Chevrolet

P0B51 Chevrolet Code - Hybrid/Electric Vehicle Battery 5 Circuit Low Voltage

Quick Answer

The Hybrid/Electric Vehicle battery pack contains 288 cells. Common causes include Faulty Hybrid/Electric Vehicle Battery Pack, Faulty Hybrid/Electric Vehicle Battery Interface Control Module. 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 Chevrolet indicates Hybrid/Electric Vehicle Battery 5 Circuit Low Voltage.
Common causes: Common causes include Faulty Hybrid/Electric Vehicle Battery Pack, Faulty Hybrid/Electric Vehicle Battery Interface Control Module.
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 921

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 Chevrolet Description

The Hybrid/Electric Vehicle battery pack contains 288 cells. Groups of three cells are welded together in parallel. There are a total of 96 cell groups in the hybrid/EV battery pack assembly. These cell groups are electrically connected in-series. Each individual cell group is rated at 3.7 V, for a nominal system voltage of 355 V direct current. The battery cells are also grouped together into three sections. The first 90 cells/30 cell groups make up battery section one. This section is adjacent to the cowl and contains batteries 67 through to 96. Battery section two is located behind section one. It is made up of 72 cells/24 cell groups and contains batteries 43 through to 66. The transverse battery section is section number three, it is made up of the remaining 126 cells/42 cell groups and contains batteries 1 through to 42. The three battery sections are individually serviceable components.
The battery energy control module monitors the voltage of the 96 battery cell groups through the four hybrid/EV battery interface control modules. Voltage sense circuits are attached to each individual cell group, and these sense circuits terminate at a connector located on the top surface of the battery section. A serviceable auxiliary battery wiring harness joins this connector to a hybrid/EV battery interface control module, also located on the top surface of the battery section. The hybrid/EV battery interface control module encodes the voltage reading and transmits it to the battery energy control module through the battery control harness. There is one hybrid/EV battery interface control module located on battery sections one and two, and two hybrid/EV battery interface control modules associated with battery section three. The hybrid/EV battery interface control module, battery energy control module wiring harness, auxiliary battery wiring harness, and battery energy control module are all considered serviceable components.
The battery energy control module will determine when a fault condition is present. Diagnostics and system status are communicated from the battery energy control module to hybrid/EV powertrain control module 2 through serial data. The hybrid/EV powertrain control module 2 is the host controller for diagnostic trouble code information.

OBDII Code P0B51 Chevrolet - Hybrid/Electric Vehicle Battery 5 Circuit Low Voltage - AutoCodes.com — P0B51 Chevrolet Code - Hybrid/Electric Vehicle Battery 5 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0B51 Chevrolet?

Faulty Hybrid/Electric Vehicle Battery Pack
Faulty Hybrid/Electric Vehicle Battery Interface Control Module

How to Fix the DTC P0B51 Chevrolet?

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 Chevrolet 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 Chevrolet Code

1. What are the common symptoms of OBDII code P0B51 in a Chevrolet hybrid/electric vehicle?

- Common symptoms may include reduced hybrid system performance, decreased fuel efficiency, and potential difficulty starting the vehicle.

2. What are the possible causes of the Hybrid/Electric Vehicle Battery 5 Circuit Low Voltage code P0B51 in a Chevrolet?

- Potential causes may include a failing or weak hybrid battery cell, issues with the battery management system, high electrical loads, or a faulty sensor.

3. How can I diagnose the OBDII code P0B51 in my Chevrolet hybrid/electric vehicle?

- Diagnosis typically involves conducting a thorough inspection of the hybrid battery pack, checking the battery voltage levels, inspecting the battery connections, and using a diagnostic scan tool to retrieve specific fault codes.

4. Can I continue driving my Chevrolet vehicle with the P0B51 code present?

- It is not recommended to continue driving the vehicle with this code present, as it can lead to further damage to the hybrid system and potential safety hazards.

5. What are some repair tips for addressing the Hybrid/Electric Vehicle Battery 5 Circuit Low Voltage code in a Chevrolet?

- Repair tips may include checking and replacing faulty battery cells, ensuring proper connection of the battery components, resetting the battery management system, and consulting a professional technician if needed.

6. How much does it typically cost to repair the P0B51 code in a Chevrolet hybrid/electric vehicle?

- The cost of repairs can vary depending on the exact cause of the issue, but it can range from a few hundred dollars for minor fixes to several thousand dollars for more complex battery replacements or system repairs.

7. Is it possible to reset the P0B51 code in a Chevrolet without professional help?

- While some simple issues may be resolved by disconnecting the hybrid battery for a short period to reset the system, it is generally recommended to seek professional assistance to properly diagnose and address the underlying cause of the code.

8. How important is it to address the P0B51 code promptly in a Chevrolet hybrid/electric vehicle?

- It is crucial to address the code promptly to prevent potential damage to the hybrid system, ensure optimal vehicle performance, and maintain overall safety while driving the vehicle.

9. Are there any preventive maintenance measures to avoid the P0B51 code in a Chevrolet hybrid/electric vehicle?

- Regularly servicing the hybrid battery, monitoring battery health, avoiding overloading the electrical system, and following the manufacturer's maintenance schedule can help prevent issues leading to the P0B51 code.

10. Can the P0B51 code in a Chevrolet hybrid/electric vehicle be related to other OBDII trouble codes?

- Yes, the P0B51 code may sometimes be accompanied by other related codes such as P0B50 (Hybrid/Electric Vehicle Battery 5 Circuit High Voltage) or codes indicating issues with the hybrid system components.