AutoCodes – Buick – P1B8F Buick

P1B8F Buick Code - Hybrid/Electric Vehicle Battery 57 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: P1B8F Buick indicates Hybrid/Electric Vehicle Battery 57 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 745

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 P1B8F 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 P1B8F Buick - Hybrid/Electric Vehicle Battery 57 Circuit High Voltage - AutoCodes.com — P1B8F Buick Code - Hybrid/Electric Vehicle Battery 57 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1B8F Buick?

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

How to Fix the DTC P1B8F 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 P1B8F 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 P1B8F Buick Code

What does OBDII code P1B8F mean on a Buick?

Code P1B8F indicates that the hybrid/electric vehicle battery circuit for cell 57 is experiencing high voltage, which may signal an issue with the battery or its associated circuitry.

What are the symptoms of code P1B8F in a Buick?

Symptoms may include warning lights on the dashboard, reduced fuel efficiency, limited hybrid system functionality, or decreased overall vehicle performance.

What causes the P1B8F code to appear in a Buick?

Common causes include a faulty hybrid battery cell, wiring issues such as damaged or corroded connections, or a malfunctioning battery control module.

Can I drive my Buick with the P1B8F code?

Driving with this code is not recommended, as it may lead to further damage to the hybrid system and reduce vehicle reliability or efficiency.

How do technicians diagnose code P1B8F in a Buick?

Technicians typically use a scan tool to verify the code, inspect the hybrid battery and circuit wiring, and perform voltage and resistance tests to identify the root cause.

How can code P1B8F be fixed on a Buick?

Repairs may involve replacing the faulty battery cell, repairing damaged wiring, or recalibrating or replacing the hybrid battery control module.

Does code P1B8F require hybrid battery replacement?

Not always. If only one cell or a specific circuit is faulty, targeted repairs may suffice instead of replacing the entire hybrid battery pack.

What tools are needed to fix code P1B8F in a Buick?

Tools typically include an OBDII scan tool, a multimeter for voltage testing, and specialized equipment for hybrid battery diagnostics and repair.

Can code P1B8F cause long-term damage to my Buick?

Yes, ignoring this code can stress the hybrid battery and associated components, potentially leading to costly repairs or reduced battery lifespan.

How much does it cost to repair code P1B8F on a Buick?

Repair costs vary widely depending on the issue, ranging from simple wiring fixes to expensive hybrid battery cell replacements, typically costing several hundred to a few thousand dollars.