AutoCodes – Generic – P1B5B

P1B5B 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 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 1,130

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 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 - Hybrid/Electric Vehicle Battery 40 Circuit Low Voltage - AutoCodes.com — P1B5B Code - Hybrid/Electric Vehicle Battery 40 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B5B?

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

How to Fix the DTC P1B5B?

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 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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Need Help with the Code?

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Information for Specific Makes

P1B5B Buick — Hybrid/Electric Vehicle Battery 40 Circuit Low Voltage
P1B5B Cadillac — Hybrid/Electric Vehicle Battery 40 Circuit Low Voltage
P1B5B Chevrolet — Hybrid/Electric Vehicle Battery 40 Circuit Low Voltage
P1B5B GMC — Hybrid/Electric Vehicle Battery 40 Circuit Low Voltage
P1B5B Saturn — Hybrid/Electric Vehicle Battery 40 Circuit Low Voltage

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 Code

1. What are the common symptoms of OBDII code P1B5B (Hybrid/Electric Vehicle Battery 40 Circuit Low Voltage)?

- Common symptoms include poor battery performance, reduced electric driving range, and potential issues with starting the vehicle.

2. What can cause the OBDII code P1B5B to trigger?

- The code P1B5B may be triggered by a weak or failing battery, faulty battery circuit components, or issues with the hybrid/electric vehicle's charging system.

3. How can I diagnose the cause of the OBDII code P1B5B?

- Diagnosing the cause of P1B5B typically involves checking the battery voltage levels, inspecting the battery circuit connections, and testing the charging system components.

4. Is it safe to continue driving with the OBDII code P1B5B present?

- It is not recommended to continue driving with the P1B5B code present, as it can lead to further damage to the battery system and potentially affect the vehicle's performance.

5. Can I repair the OBDII code P1B5B issue myself?

- While some basic troubleshooting steps can be taken, diagnosing and repairing the P1B5B code often requires specialized knowledge and equipment, so it is recommended to seek assistance from a professional technician.

6. How much does it typically cost to repair the OBDII code P1B5B?

- The cost of repairing the P1B5B code can vary depending on the specific cause of the issue, but it may involve replacing battery components, circuitry repairs, or addressing charging system problems, which can range from a few hundred to over a thousand dollars.

7. Can a low 12-volt auxiliary battery cause the OBDII code P1B5B?

- Yes, a low or failing 12-volt auxiliary battery can contribute to triggering the P1B5B code, as it plays a crucial role in supporting the hybrid/electric vehicle's electrical system.

8. How important is it to address the OBDII code P1B5B promptly?

- It is essential to address the P1B5B code promptly to prevent further damage to the battery system, ensure the vehicle's optimal performance, and avoid potential safety risks associated with battery issues.

9. Will resetting the OBDII code P1B5B make it go away permanently?

- Simply resetting the P1B5B code may temporarily clear the warning light, but if the underlying issue is not addressed, the code is likely to reappear as the problem persists.

10. Is the OBDII code P1B5B specific to certain hybrid or electric vehicle models?

- The OBDII code P1B5B related to Hybrid/Electric Vehicle Battery 40 Circuit Low Voltage can be specific to certain hybrid or electric vehicle models, so it's important to consult the vehicle's manual or a professional technician for model-specific information.