AutoCodes – Chevrolet – P1B5B Chevrolet

P1B5B Chevrolet Code - Hybrid/Electric Vehicle Battery 40 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: P1B5B Chevrolet indicates Hybrid/Electric Vehicle Battery 40 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 818

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 12, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1B5B 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 P1B5B Chevrolet - Hybrid/Electric Vehicle Battery 40 Circuit Low Voltage - AutoCodes.com — P1B5B Chevrolet Code - Hybrid/Electric Vehicle Battery 40 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B5B Chevrolet?

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

How to Fix the DTC P1B5B 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 P1B5B 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 P1B5B Chevrolet Code

1. What are common symptoms of OBDII code P1B5B in a Chevrolet hybrid/electric vehicle?

- Common symptoms include reduced power, poor fuel efficiency, and difficulty starting the vehicle.

2. What can cause the OBDII code P1B5B to trigger in a Chevrolet hybrid/electric vehicle?

- The code P1B5B is typically triggered by low voltage in the battery pack's 40th circuit, which can be caused by a faulty battery cell or a problem with the battery management system.

3. How can I diagnose the OBDII code P1B5B in my Chevrolet hybrid/electric vehicle?

- Diagnosing the code P1B5B usually requires specialized diagnostic equipment to test the battery pack's voltage levels and individual cell performance.

4. Can I drive my Chevrolet hybrid/electric vehicle with the OBDII code P1B5B present?

- It is not recommended to drive the vehicle with the code P1B5B present, as it can lead to further damage to the battery pack and potentially unsafe driving conditions.

5. How can I repair the OBDII code P1B5B in my Chevrolet hybrid/electric vehicle?

- Repairing the code P1B5B often involves replacing the faulty battery cell or addressing issues with the battery management system. It is recommended to have a trained technician perform the repair.

6. Are there any maintenance tips to prevent the OBDII code P1B5B in my Chevrolet hybrid/electric vehicle?

- Regularly maintaining and monitoring the health of the battery pack, as well as following manufacturer-recommended service intervals, can help prevent issues that may trigger the code P1B5B.

7. Is the OBDII code P1B5B specific to Chevrolet hybrid/electric vehicles?

- The OBDII code P1B5B related to the Hybrid/Electric Vehicle Battery 40 Circuit Low Voltage is specific to hybrid/electric vehicles, including those manufactured by Chevrolet.

8. Can a DIY enthusiast fix the OBDII code P1B5B issue in a Chevrolet hybrid/electric vehicle?

- Due to the complexity and safety considerations involved in working with high-voltage hybrid/electric vehicle systems, it is recommended to seek professional help from a certified technician for repairing the code P1B5B.

9. How long does it typically take to repair the OBDII code P1B5B in a Chevrolet hybrid/electric vehicle?

- The repair time for the OBDII code P1B5B can vary depending on the specific issue causing the code, but it may take several hours to diagnose and repair the problem.

10. Can resetting the OBDII code P1B5B in my Chevrolet hybrid/electric vehicle make it go away permanently?

- Resetting the code P1B5B may temporarily clear the warning light, but if the underlying issue causing the code is not addressed, it is likely to reappear. It is crucial to diagnose and fix the root cause of the problem.