AutoCodes – Cadillac – P0B5B Cadillac

P0B5B Cadillac Code - Hybrid/Electric Vehicle Battery 7 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: P0B5B Cadillac indicates Hybrid/Electric Vehicle Battery 7 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 987

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 P0B5B 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 P0B5B Cadillac - Hybrid/Electric Vehicle Battery 7 Circuit Low Voltage - AutoCodes.com — P0B5B Cadillac Code - Hybrid/Electric Vehicle Battery 7 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0B5B Cadillac?

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

How to Fix the DTC P0B5B 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 P0B5B 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 P0B5B Cadillac Code

What does the OBDII code P0B5B mean on a Cadillac?

The P0B5B code indicates "Hybrid/Electric Vehicle Battery 7 Circuit Low Voltage," meaning the voltage in battery module 7 is below the expected range.

What are the symptoms of the P0B5B code in a Cadillac?

Common symptoms include reduced hybrid or electric performance, warning lights on the dashboard, decreased fuel efficiency, and possible limp mode activation.

What causes the P0B5B code to appear?

The code can be triggered by a faulty battery module, damaged wiring or connectors, a malfunctioning battery control module, or excessive voltage drops in the circuit.

How can I fix the P0B5B code on my Cadillac?

Repairs may involve inspecting and replacing the affected battery module, repairing damaged wiring or connectors, or recalibrating the battery control module.

Can I continue driving with the P0B5B code active?

Itâ€™s not recommended to drive for an extended period with this code, as it may lead to further damage or reduce the vehicle's performance and safety.

How is the P0B5B code diagnosed?

A mechanic will use a scan tool to confirm the code, inspect the hybrid battery system for voltage inconsistencies, and perform tests on the wiring, connectors, and control module.

Is the P0B5B code covered under warranty for my Cadillac?

It depends on the age and mileage of your vehicle, as well as the specific terms of your hybrid or EV battery warranty. Check with your dealership for details.

Can a low 12-volt auxiliary battery cause the P0B5B code?

No, this code specifically relates to the hybrid or EV high-voltage battery system, not the 12-volt auxiliary battery.

How much does it cost to repair the P0B5B code?

Repair costs vary but can range from $500 to $2,000 or more, depending on whether the battery module, wiring, or control module needs repair or replacement.

Can the P0B5B code clear itself?

The code is unlikely to clear itself as it indicates a persistent low voltage issue. Repairs will be needed to resolve the underlying problem.