AutoCodes – Cadillac – P0B75 Cadillac

P0B75 Cadillac Code - Hybrid/Electric Vehicle Battery 12 Circuit High 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: P0B75 Cadillac indicates Hybrid/Electric Vehicle Battery 12 Circuit High 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 923

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 P0B75 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 P0B75 Cadillac - Hybrid/Electric Vehicle Battery 12 Circuit High Voltage - AutoCodes.com — P0B75 Cadillac Code - Hybrid/Electric Vehicle Battery 12 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0B75 Cadillac?

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

How to Fix the DTC P0B75 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 P0B75 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 P0B75 Cadillac Code

What does the OBDII code P0B75 mean on a Cadillac?

The P0B75 code indicates a "Hybrid/Electric Vehicle Battery 12 Circuit High Voltage" issue, meaning the voltage in battery circuit 12 is higher than the expected range.

What are the common symptoms of the P0B75 code?

Symptoms may include an illuminated check engine light, reduced hybrid or EV performance, limited driving range, or the vehicle switching to a fail-safe mode.

What causes the P0B75 code to appear?

Common causes include a faulty battery module, damaged wiring or connectors in circuit 12, a malfunctioning battery control module, or an internal short in the hybrid battery pack.

Can I drive my Cadillac with the P0B75 code?

Driving with this code is not recommended as it may lead to further damage to the hybrid system and compromise vehicle performance or safety.

How is the P0B75 code diagnosed?

A technician will use a scan tool to verify the code, inspect the battery circuit 12 wiring and connectors, check for loose or corroded connections, and test the hybrid battery modules for faults.

What repairs can fix the P0B75 code?

Repairs may include replacing a faulty battery module, repairing or replacing damaged wiring, cleaning or tightening connectors, or reprogramming or replacing the battery control module.

How much does it cost to fix the P0B75 code?

Repair costs vary but can range from $200 for minor wiring repairs to over $1,000 if the hybrid battery pack or control module needs replacement.

Can a low 12-volt battery cause the P0B75 code?

A low 12-volt battery is unlikely to cause this specific code, as it relates to the high-voltage hybrid battery system rather than the auxiliary 12-volt system.

Is the P0B75 code covered under warranty?

If your vehicle is still under its hybrid system warranty, repairs related to the hybrid battery or control module may be covered. Check with your dealership for details.

How can I prevent the P0B75 code from occurring?

Regular maintenance of the hybrid system, inspecting wiring and connectors for damage, and addressing any warning lights promptly can help prevent this issue.