AutoCodes – Generic – P1B8B

P1B8B Code - Hybrid/Electric Vehicle Battery 56 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: P1B8B indicates Hybrid/Electric Vehicle Battery 56 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 869

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 P1B8B 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 P1B8B - Hybrid/Electric Vehicle Battery 56 Circuit Low Voltage - AutoCodes.com — P1B8B Code - Hybrid/Electric Vehicle Battery 56 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B8B?

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

How to Fix the DTC P1B8B?

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 P1B8B 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

P1B8B Buick — Hybrid/Electric Vehicle Battery 56 Circuit Low Voltage
P1B8B Cadillac — Hybrid/Electric Vehicle Battery 56 Circuit Low Voltage
P1B8B Chevrolet — Hybrid/Electric Vehicle Battery 56 Circuit Low Voltage
P1B8B GMC — Hybrid/Electric Vehicle Battery 56 Circuit Low Voltage
P1B8B Saturn — Hybrid/Electric Vehicle Battery 56 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 P1B8B Code

1. What are the common symptoms of OBDII code P1B8B (Hybrid/Electric Vehicle Battery 56 Circuit Low Voltage)?

- Common symptoms include decreased electric vehicle range, poor battery performance, and potential warning lights on the dashboard.

2. What are the possible causes of OBDII code P1B8B?

- Possible causes include issues with the hybrid/electric vehicle battery 56 circuit, a malfunctioning battery pack, loose or corroded electrical connections, or a faulty battery management system.

3. How can I diagnose OBDII code P1B8B at home?

- Diagnosing this code may require specialized diagnostic tools and knowledge of hybrid/electric vehicle systems. It is recommended to consult with a professional technician for accurate diagnosis.

4. Can I continue driving my vehicle with OBDII code P1B8B present?

- It is not recommended to continue driving the vehicle with this code present, as it can lead to further damage to the battery system and affect the overall performance of the vehicle.

5. How can I repair OBDII code P1B8B?

- Repairing this code may involve troubleshooting the battery 56 circuit, checking and repairing any loose connections, inspecting the battery pack for damage, and resetting the battery management system.

6. Is it safe to reset the OBDII code P1B8B on my own?

- It is generally safe to reset the code on your own using an OBDII scanner. However, it is important to address the underlying issue causing the code to prevent it from reoccurring.

7. How much does it cost to repair OBDII code P1B8B?

- The cost of repair can vary depending on the specific issue causing the code, the vehicle make and model, and the labor rates of the repair shop. It is recommended to obtain a diagnosis and estimate from a professional technician.

8. Can extreme weather conditions affect OBDII code P1B8B?

- Extreme weather conditions, such as extreme heat or cold, can potentially impact the performance of the hybrid/electric vehicle battery and contribute to the occurrence of code P1B8B. It is important to monitor the battery system in such conditions.

9. How often should I have my hybrid/electric vehicle battery system inspected to prevent OBDII code P1B8B?

- It is recommended to have your hybrid/electric vehicle battery system inspected regularly as part of routine maintenance to detect any potential issues early and prevent the occurrence of code P1B8B.

10. Are there any DIY tips to prevent OBDII code P1B8B from occurring?

- To prevent code P1B8B, you can regularly check the battery connections for tightness and signs of corrosion, monitor the battery performance, follow the manufacturer's maintenance schedule, and avoid overcharging or deep discharging the battery.