AutoCodes – Generic – P1B45

P1B45 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 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 1,351

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

What does this mean?

What are the Possible Causes of the DTC P1B45?

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

How to Fix the DTC P1B45?

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 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.

Need more information about the P1B45 code?

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Need Help with the Code?

Get the P1B45 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1B45 Buick — Hybrid/Electric Vehicle Battery 33 Circuit Performance
P1B45 Cadillac — Hybrid/Electric Vehicle Battery 33 Circuit Performance
P1B45 Chevrolet — Hybrid/Electric Vehicle Battery 33 Circuit Performance
P1B45 GMC — Hybrid/Electric Vehicle Battery 33 Circuit Performance
P1B45 Saturn — Hybrid/Electric Vehicle Battery 33 Circuit Performance

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 Code

1. What does OBDII code P1B45 mean?

Code P1B45 indicates a performance issue in the Hybrid/Electric Vehicle Battery 33 Circuit, which monitors or controls a specific battery module in the hybrid or electric system.

2. What are the common symptoms of P1B45?

Symptoms may include an illuminated check engine light, reduced fuel economy, limited electric vehicle range, or decreased overall vehicle performance.

3. What causes the P1B45 code to appear?

Common causes include a faulty battery module, damaged wiring or connectors in the battery circuit, issues with the battery management system (BMS), or software glitches.

4. Can I keep driving with the P1B45 code?

While the vehicle may still be drivable, operating it with this code can lead to further damage to the hybrid/electric system or reduced performance. Itâ€™s best to address the issue promptly.

5. How do you diagnose the P1B45 code?

Diagnosing this code typically involves scanning the vehicle with an advanced OBDII tool, inspecting battery module 33 and its associated wiring, and testing the battery management system for faults.

6. What repairs can fix the P1B45 code?

Repairs may include replacing the faulty battery module, repairing or replacing damaged wiring or connectors, or updating the battery management systemâ€™s software.

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

Repair costs can vary widely, ranging from $200 for minor wiring repairs to over $1,000 if a battery module or control system component needs replacement.

8. Can a software update resolve the P1B45 code?

In some cases, a software update to the battery management system may resolve the issue if the problem is related to programming errors.

9. Does P1B45 mean the entire hybrid battery needs replacement?

Not necessarily. This code usually points to issues with a specific battery module or circuit, so replacing the entire battery pack is often unnecessary.

10. Can a DIYer fix the P1B45 code?

Unless you're experienced with high-voltage systems and hybrid vehicles, itâ€™s recommended to leave this repair to a professional due to safety risks and the complexity of the system.