AutoCodes – Buick – P0B45 Buick

P0B45 Buick Code - Hybrid/Electric Vehicle Battery 3 Circuit

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: P0B45 Buick indicates Hybrid/Electric Vehicle Battery 3 Circuit.
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 836

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 07, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0B45 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 P0B45 Buick - Hybrid/Electric Vehicle Battery 3 Circuit - AutoCodes.com — P0B45 Buick Code - Hybrid/Electric Vehicle Battery 3 Circuit

What does this mean?

What are the Possible Causes of the DTC P0B45 Buick?

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

How to Fix the DTC P0B45 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 P0B45 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 P0B45 Buick Code

1. What does the OBDII code P0B45 mean on a Buick?

P0B45 indicates an issue with the Hybrid/Electric Vehicle Battery 3 Circuit, which typically refers to a fault in the voltage monitoring or communication with the third section of the battery pack.

2. What are the symptoms of code P0B45 in a Buick?

Common symptoms include an illuminated check engine light, reduced fuel efficiency, limited hybrid/electric functionality, or the vehicle entering "limp" mode.

3. What causes the P0B45 code to appear in a Buick?

Potential causes include a faulty battery sensor, damaged wiring or connectors in the battery circuit, a malfunctioning battery control module, or internal issues within the battery pack.

4. Can I drive my Buick with the P0B45 code?

It is not recommended to drive with this code, as it could lead to further damage to the hybrid/electric system and reduced vehicle performance or safety.

5. How is the P0B45 code diagnosed?

Technicians typically use a scan tool to retrieve the code, inspect the battery circuit wiring and connections, and perform voltage and resistance tests on the affected battery section.

6. How do I fix the P0B45 code on my Buick?

Repairs might involve replacing a damaged battery sensor, repairing or replacing faulty wiring, or replacing the battery control module or battery pack if necessary.

7. How much does it cost to fix a P0B45 code on a Buick?

Repair costs can vary widely, from a few hundred dollars for wiring repairs to several thousand dollars if the battery pack needs replacement.

8. Can a weak 12V battery cause the P0B45 code?

While the 12V battery is not directly related, a weak or failing 12V battery can cause electrical issues that may affect the hybrid/electric system diagnostics.

9. Are there any recalls related to the P0B45 code for Buick vehicles?

You should check with your Buick dealer or the NHTSA website to see if there are any recalls or service bulletins related to the hybrid/electric battery system for your specific vehicle.

10. Can I clear the P0B45 code without fixing the issue?

Clearing the code without addressing the root cause will likely result in the code returning and may worsen the condition of the battery or hybrid system over time.