AutoCodes – Buick – P1BD5 Buick

P1BD5 Buick Code - Hybrid/Electric Vehicle Battery 81 Circuit Performance

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: P1BD5 Buick indicates Hybrid/Electric Vehicle Battery 81 Circuit Performance.
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 922

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 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
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Code P1BD5 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 P1BD5 Buick - Hybrid/Electric Vehicle Battery 81 Circuit Performance - AutoCodes.com — P1BD5 Buick Code - Hybrid/Electric Vehicle Battery 81 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P1BD5 Buick?

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

How to Fix the DTC P1BD5 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 P1BD5 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 P1BD5 Buick Code

1. What does the OBDII code P1BD5 mean on a Buick?

P1BD5 indicates a "Hybrid/Electric Vehicle Battery 81 Circuit Performance" issue, meaning there's a problem with the performance or functionality of a specific battery circuit in the hybrid or electric vehicle system.

2. What are the common symptoms of code P1BD5 on a Buick?

Symptoms may include the illumination of the check engine light, reduced hybrid or electric vehicle performance, decreased fuel efficiency, or limited battery charging/discharging capability.

3. What causes the P1BD5 code to appear on a Buick?

The code can be caused by faulty battery sensors, wiring or connector issues, a malfunction in the battery control module, or a degraded or damaged hybrid battery cell.

4. Can I still drive my Buick with the P1BD5 code active?

While it may still be drivable, the vehicle could experience reduced performance or efficiency. It's recommended to address the issue promptly to avoid further damage to the hybrid/electric system.

5. How is the P1BD5 code diagnosed on a Buick?

Technicians will use a scan tool to read the code, inspect the battery's circuits, connectors, and wiring, test the battery control module, and possibly perform load tests on the hybrid battery.

6. What repairs are needed to fix the P1BD5 code on a Buick?

Repairs may involve replacing a faulty battery sensor, repairing or replacing damaged wiring or connectors, reprogramming or replacing the battery control module, or addressing issues with the hybrid battery pack.

7. How much does it cost to fix the P1BD5 code on a Buick?

Costs vary depending on the root cause but can range from $100 for simple wiring repairs to several thousand dollars if the hybrid battery needs replacement.

8. Can the P1BD5 code be triggered by a weak 12V auxiliary battery?

No, this code is specific to the hybrid/electric battery system and not related to the 12V auxiliary battery.

9. Will clearing the P1BD5 code solve the issue?

Clearing the code may temporarily remove the warning light, but if the underlying problem isn't resolved, the code will likely return.

10. Is the P1BD5 code covered under Buick's hybrid/electric vehicle warranty?

In many cases, hybrid systems, including the battery, are covered under extended warranties. Check your vehicle's warranty details to confirm coverage.