AutoCodes – Cadillac – P0BB5 Cadillac

P0BB5 Cadillac Code - Hybrid/Electric Vehicle Battery 25 Circuit Low Voltage

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: P0BB5 Cadillac indicates Hybrid/Electric Vehicle Battery 25 Circuit Low Voltage.
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 984

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 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0BB5 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 P0BB5 Cadillac - Hybrid/Electric Vehicle Battery 25 Circuit Low Voltage - AutoCodes.com — P0BB5 Cadillac Code - Hybrid/Electric Vehicle Battery 25 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0BB5 Cadillac?

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

How to Fix the DTC P0BB5 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 P0BB5 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 P0BB5 Cadillac Code

1. What does the OBDII code P0BB5 mean on a Cadillac?

Code P0BB5 indicates a low voltage issue in the Hybrid/Electric Vehicle Battery 25 Circuit, which is part of the high-voltage battery system.

2. What are the symptoms of code P0BB5 in a Cadillac?

Symptoms may include reduced hybrid system performance, warning lights on the dashboard, decreased fuel efficiency, and potential charging issues.

3. What causes the P0BB5 code to trigger?

Possible causes include a faulty battery module, damaged wiring or connectors in the circuit, a malfunctioning battery control module, or corrosion in the electrical contacts.

4. Can driving with code P0BB5 damage my Cadillac?

Yes, driving with this code can lead to further damage to the hybrid battery system or other components if not addressed promptly.

5. How is the P0BB5 code diagnosed?

Technicians typically use a scan tool to confirm the code, inspect the wiring and connectors for damage, and test the battery module and control system for proper voltage levels.

6. Can a weak 12V battery cause the P0BB5 code?

While the 12V battery is not directly related to this issue, a weak or failing 12V battery may contribute to electrical problems that affect the hybrid system.

7. How do I fix the P0BB5 code on my Cadillac?

Repairs may involve replacing the faulty battery module, repairing damaged wiring or connectors, or reprogramming the battery control module.

8. How much does it cost to fix the P0BB5 code on a Cadillac?

Repair costs can vary widely, ranging from $200 for minor wiring repairs to over $2,000 if a battery module replacement is needed.

9. Can I clear the P0BB5 code without fixing the problem?

Clearing the code without addressing the root cause is not recommended, as the issue will likely return and could cause further complications.

10. Is the P0BB5 code covered under Cadillacâ€™s hybrid battery warranty?

This depends on the age and mileage of the vehicle, as well as the terms of Cadillacâ€™s hybrid battery warranty. Check with your dealership for specific coverage details.