AutoCodes – Buick – P1B27 Buick

P1B27 Buick Code - Hybrid/Electric Vehicle Battery 32 Circuit High 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: P1B27 Buick indicates Hybrid/Electric Vehicle Battery 32 Circuit High 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 800

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 P1B27 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 P1B27 Buick - Hybrid/Electric Vehicle Battery 32 Circuit High Voltage - AutoCodes.com — P1B27 Buick Code - Hybrid/Electric Vehicle Battery 32 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1B27 Buick?

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

How to Fix the DTC P1B27 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 P1B27 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 P1B27 Buick Code

1. What does the OBDII code P1B27 mean on a Buick?

P1B27 indicates a problem with the high voltage in the Hybrid/Electric Vehicle Battery 32 circuit, often related to the battery control system.

2. What are the symptoms of code P1B27 in a Buick?

Symptoms may include the check engine light turning on, reduced hybrid or EV system performance, and possible limited driving range.

3. What causes the P1B27 code to appear?

Common causes include faulty battery cells, wiring issues in the high-voltage circuit, a malfunctioning battery control module, or corrosion in electrical connections.

4. Is the P1B27 code serious?

Yes, the P1B27 code can indicate issues with the high-voltage battery, which may lead to reduced vehicle performance or potential safety risks if not addressed.

5. Can I drive my Buick with the P1B27 code active?

Driving with the P1B27 code is not recommended, as it could further damage the battery or hybrid system and may leave you stranded if the vehicle loses power.

6. How is the P1B27 code diagnosed?

A technician will use a scan tool to check for the code, inspect the high-voltage wiring and connections, and test the battery control module and individual battery cells.

7. What repairs are needed for the P1B27 code?

Repairs may include replacing damaged wiring, cleaning corroded connections, reprogramming or replacing the battery control module, or replacing faulty battery cells.

8. How much does it cost to fix the P1B27 code on a Buick?

Costs vary depending on the exact issue but could range from $200 for minor wiring repairs to $1,000 or more for battery-related component replacements.

9. Can the P1B27 code be caused by software issues?

Yes, outdated or corrupted software in the battery control module can sometimes trigger the P1B27 code and may require a software update.

10. How can I prevent the P1B27 code from occurring again?

Regular maintenance, inspecting high-voltage connections, and addressing any warning signs in the hybrid/EV system promptly can help prevent this code from recurring.