AutoCodes – Buick – P1BB5 Buick

P1BB5 Buick Code - Hybrid/Electric Vehicle Battery 70 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: P1BB5 Buick indicates Hybrid/Electric Vehicle Battery 70 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 766

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 P1BB5 Buick 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 P1BB5 Buick - Hybrid/Electric Vehicle Battery 70 Circuit Low Voltage - AutoCodes.com — P1BB5 Buick Code - Hybrid/Electric Vehicle Battery 70 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1BB5 Buick?

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

How to Fix the DTC P1BB5 Buick?

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 P1BB5 Buick 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 P1BB5 Buick Code

1. What does the OBDII code P1BB5 mean for a Buick?

P1BB5 indicates a "Hybrid/Electric Vehicle Battery 70 Circuit Low Voltage," meaning the vehicle's hybrid battery system is detecting abnormally low voltage in one of its circuits.

2. What are the common symptoms of code P1BB5?

Symptoms may include a check engine light, reduced fuel efficiency, decreased hybrid system performance, and possible vehicle hesitation or limited electric drive mode.

3. What causes the P1BB5 code to trigger?

This code can be caused by a faulty hybrid battery module, damaged wiring or connectors in the battery circuit, a bad battery control module, or excessive voltage drops due to corrosion.

4. Can I drive my Buick with a P1BB5 code?

It is not recommended to drive with this code active, as it could lead to further damage to the hybrid system or a complete loss of electric drive functionality.

5. How is the P1BB5 code diagnosed?

A technician will use a scan tool to confirm the code, inspect the hybrid battery system, check for damaged wiring or connections, and test individual battery cells or modules for low voltage.

6. What repairs are needed to fix the P1BB5 code?

Repairs may include replacing faulty battery modules, repairing or replacing damaged wiring, cleaning corroded connectors, or updating the battery control module software.

7. Is the P1BB5 code specific to the hybrid system in Buicks?

Yes, this code specifically pertains to the hybrid or electric vehicle battery system and is most commonly seen in Buick hybrid or plug-in hybrid models.

8. How much does it cost to repair a P1BB5 code?

Repair costs can vary widely depending on the issue, ranging from $100 for a wiring repair to over $1,000 for battery module replacement.

9. Can a low 12-volt battery cause the P1BB5 code?

No, the P1BB5 code is related to the hybrid battery system and not the standard 12-volt battery used for starting and accessories.

10. How can I prevent the P1BB5 code from occurring?

Regular maintenance of the hybrid system, ensuring battery connections are clean and secure, and addressing warning lights promptly can help prevent this code.