AutoCodes – Buick – P1B45 Buick

P1B45 Buick Code - Hybrid/Electric Vehicle Battery 33 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: P1B45 Buick indicates Hybrid/Electric Vehicle Battery 33 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 696

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 P1B45 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 P1B45 Buick - Hybrid/Electric Vehicle Battery 33 Circuit Performance - AutoCodes.com — P1B45 Buick Code - Hybrid/Electric Vehicle Battery 33 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P1B45 Buick?

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

How to Fix the DTC P1B45 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 P1B45 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 P1B45 Buick Code

1. What does the OBDII code P1B45 mean on a Buick?

The P1B45 code indicates an issue with the Hybrid/Electric Vehicle Battery 33 Circuit Performance, suggesting a fault in one of the battery modules or its associated circuitry.

2. What are the common symptoms of code P1B45 in a Buick?

Symptoms may include an illuminated check engine light, reduced hybrid or EV performance, limited battery charging or discharging, and potential warning messages on the dashboard.

3. What causes the P1B45 code to appear?

Common causes include a faulty battery cell or module, damaged wiring in the battery circuit, a failed battery control module, or poor electrical connections.

4. Can I drive my Buick with a P1B45 code?

Driving with this code is not recommended, as it may lead to reduced hybrid system performance and potential long-term damage to the battery.

5. How is the P1B45 code diagnosed?

A technician will use a scan tool to read the code, inspect the battery module and its circuits, check for loose or damaged wiring, and test the battery cells for performance issues.

6. What repairs are needed to fix the P1B45 code?

Repairs may involve replacing a faulty battery cell or module, repairing or replacing damaged wiring, cleaning or tightening electrical connections, or reprogramming the battery control module.

7. How much does it cost to fix the P1B45 code on a Buick?

Repair costs vary depending on the issue but can range from $200 for minor wiring fixes to over $1,000 for battery module replacement.

8. Can a weak 12V battery trigger the P1B45 code?

While unlikely, a weak 12V battery might contribute to communication or voltage issues in the hybrid system, so it should be tested as part of the diagnosis.

9. How can I prevent the P1B45 code from occurring?

Regular maintenance, monitoring battery health, and addressing any hybrid system warnings promptly can help prevent this code from appearing.

10. Does the P1B45 code mean the entire battery pack needs replacement?

Not necessarily; the issue may be isolated to a specific cell, module, or circuit, allowing for targeted repairs rather than replacing the entire battery pack.