AutoCodes – Generic – P1B1A

P1B1A Code - Hybrid/Electric Vehicle Battery 28 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: P1B1A indicates Hybrid/Electric Vehicle Battery 28 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 1,092

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 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1B1A 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 P1B1A - Hybrid/Electric Vehicle Battery 28 Circuit Low Voltage - AutoCodes.com — P1B1A Code - Hybrid/Electric Vehicle Battery 28 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B1A?

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

How to Fix the DTC P1B1A?

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 P1B1A 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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Information for Specific Makes

P1B1A Buick — Hybrid/Electric Vehicle Battery 28 Circuit Low Voltage
P1B1A Cadillac — Hybrid/Electric Vehicle Battery 28 Circuit Low Voltage
P1B1A Chevrolet — Hybrid/Electric Vehicle Battery 28 Circuit Low Voltage
P1B1A GMC — Hybrid/Electric Vehicle Battery 28 Circuit Low Voltage
P1B1A Saturn — Hybrid/Electric Vehicle Battery 28 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 P1B1A Code

1. What are common symptoms of OBDII code P1B1A (Hybrid/Electric Vehicle Battery 28 Circuit Low Voltage)?

- Common symptoms include reduced electric vehicle range, poor performance, and potential warning lights on the dashboard related to the hybrid/electric system.

2. What can cause the OBDII code P1B1A to trigger?

- This code may be triggered by issues such as a faulty battery pack, damaged wiring in the 28 circuit, or a problem with the battery management system.

3. How serious is the Hybrid/Electric Vehicle Battery 28 Circuit Low Voltage code P1B1A?

- Ignoring this code can lead to reduced performance and potential damage to the electric components of the vehicle. It is important to address this issue promptly.

4. Can I still drive my hybrid/electric vehicle with the P1B1A code present?

- It is not recommended to drive the vehicle with this code present, as it indicates a potential issue with the battery system that can impact performance and safety.

5. How can I diagnose the cause of the P1B1A code?

- Diagnosing the cause of this code typically involves using a scan tool to check the battery voltage, inspecting the wiring in the 28 circuit, and testing the battery management system.

6. What are some repair tips for fixing the Hybrid/Electric Vehicle Battery 28 Circuit Low Voltage code?

- Repair tips may include checking and repairing any damaged wiring, testing and potentially replacing the battery pack, and ensuring the battery management system is functioning correctly.

7. Is it safe to reset the OBDII code P1B1A without addressing the underlying issue?

- Resetting the code without addressing the underlying issue is not recommended, as the problem may persist and potentially lead to further damage to the vehicle's electrical components.

8. How much does it typically cost to repair the Hybrid/Electric Vehicle Battery 28 Circuit Low Voltage issue?

- The cost of repair can vary depending on the root cause of the problem, but it may involve expenses for parts replacement, labor, and diagnostic services from a qualified technician.

9. Can a DIY enthusiast fix the P1B1A code on a hybrid/electric vehicle?

- While some basic troubleshooting steps can be taken by a knowledgeable DIY enthusiast, diagnosing and repairing issues related to the hybrid/electric system may require specialized training and tools.

10. How can I prevent the OBDII code P1B1A from recurring in the future?

- Regular maintenance of the hybrid/electric vehicle, including checking the battery system, monitoring charging habits, and addressing any warning lights promptly, can help prevent the recurrence of this code.