AutoCodes – Buick – P1B8E Buick

P1B8E Buick Code - Hybrid/Electric Vehicle Battery 57 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: P1B8E Buick indicates Hybrid/Electric Vehicle Battery 57 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 975

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 P1B8E 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 P1B8E Buick - Hybrid/Electric Vehicle Battery 57 Circuit Low Voltage - AutoCodes.com — P1B8E Buick Code - Hybrid/Electric Vehicle Battery 57 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B8E Buick?

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

How to Fix the DTC P1B8E 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 P1B8E 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 P1B8E Buick Code

What does the OBDII code P1B8E mean on a Buick?

The P1B8E code indicates a low voltage issue in the Hybrid/Electric Vehicle Battery 57 Circuit, often related to one of the battery modules or its wiring.

What are the common symptoms of the P1B8E code?

Common symptoms include illuminated warning lights (like the check engine or hybrid system warning), reduced fuel efficiency, limited hybrid performance, or the vehicle entering limp mode.

What causes the P1B8E code to trigger?

The code is typically caused by a faulty battery module, damaged or corroded wiring, loose connections, or a malfunctioning battery control module.

Can I drive my Buick with the P1B8E code active?

Itâ€™s not recommended to drive for long with this code, as it may lead to further damage to the hybrid/electric system and reduced vehicle performance.

How is the P1B8E code diagnosed?

A technician will use a scan tool to confirm the code, inspect the battery circuit wiring, test the voltage of individual battery modules, and check for any control module issues.

What repairs are needed to fix the P1B8E code?

Repairs may include replacing a faulty battery module, repairing or replacing damaged wiring, cleaning corroded connections, or replacing the battery control module if necessary.

Can a weak 12V battery cause the P1B8E code?

While the 12V battery isnâ€™t directly involved in the high-voltage system, a weak or failing 12V battery can sometimes cause communication issues or false codes, so itâ€™s worth checking.

How much does it cost to repair the P1B8E code on a Buick?

Repair costs can vary widely, from $100â€“$200 for wiring repairs to over $1,000 if a battery module or control module needs replacement.

Will resetting the code fix the P1B8E issue?

Simply clearing the code without addressing the underlying issue is not a fix, and the code will likely return once the system detects the problem again.

Is the P1B8E code covered under warranty for Buick vehicles?

If your vehicle is still under the hybrid/electric system warranty, this issue may be covered. Check with your dealership or consult your warranty documentation.