AutoCodes – Cadillac – P0B45 Cadillac

P0B45 Cadillac 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 Cadillac 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 1,040

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 Cadillac 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 Cadillac - Hybrid/Electric Vehicle Battery 3 Circuit - AutoCodes.com — P0B45 Cadillac Code - Hybrid/Electric Vehicle Battery 3 Circuit

What does this mean?

What are the Possible Causes of the DTC P0B45 Cadillac?

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

How to Fix the DTC P0B45 Cadillac?

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 Cadillac 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 Cadillac Code

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

The P0B45 code indicates a fault in the Hybrid/Electric Vehicle Battery 3 Circuit, which may involve a specific voltage sensor, wiring, or battery module performance issue.

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

Symptoms may include a check engine light or hybrid system warning, reduced fuel economy, limited hybrid or electric mode operation, and possible performance issues.

3. What causes the P0B45 code to appear on a Cadillac?

Common causes include a faulty battery module, damaged or corroded wiring or connectors, a malfunctioning voltage sensor, or an issue with the hybrid battery control module.

4. How serious is the P0B45 code on a Cadillac?

It is a moderately serious issue since it can impact the hybrid system's performance and fuel efficiency. Prompt diagnosis and repair are recommended to prevent further damage.

5. Can I drive my Cadillac with the P0B45 code?

While the vehicle may still be drivable, you could experience reduced hybrid functionality or damage to the hybrid battery system if the issue is not addressed.

6. How is the P0B45 code diagnosed on a Cadillac?

Technicians will use a scan tool to check for additional codes, inspect the wiring and connectors in the Battery 3 Circuit, and test the voltage sensor and hybrid battery module.

7. What repairs can fix the P0B45 code in a Cadillac?

Repairs may include replacing a damaged battery module, repairing or replacing faulty wiring, cleaning corroded connectors, or replacing a defective voltage sensor.

8. How much does it cost to fix the P0B45 code on a Cadillac?

Repair costs vary, but diagnosing and fixing wiring or connector issues may be less expensive, while replacing a hybrid battery module or voltage sensor could cost significantly more.

9. Can a dead 12V battery cause the P0B45 code on a Cadillac?

A weak or dead 12V battery is unlikely to directly cause P0B45, but it can impact the hybrid system and lead to related issues. Ensure the 12V battery is in good condition.

10. Do I need to replace the entire hybrid battery for the P0B45 code?

Not necessarily. The issue may be limited to a single battery module or circuit component. Proper diagnosis is essential to determine the exact repair needed.