AutoCodes – Cadillac – P0B8B Cadillac

P0B8B Cadillac Code - Hybrid/Electric Vehicle Battery 17 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: P0B8B Cadillac indicates Hybrid/Electric Vehicle Battery 17 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 829

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 P0B8B 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 P0B8B Cadillac - Hybrid/Electric Vehicle Battery 17 Circuit - AutoCodes.com — P0B8B Cadillac Code - Hybrid/Electric Vehicle Battery 17 Circuit

What does this mean?

What are the Possible Causes of the DTC P0B8B Cadillac?

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

How to Fix the DTC P0B8B 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 P0B8B 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 P0B8B Cadillac Code

What does the OBDII code P0B8B mean for my Cadillac?

The code P0B8B indicates a problem with the hybrid/electric vehicle battery, specifically related to the 17 circuit. It signals an issue with the battery management or voltage levels in the system.

What are common symptoms of the P0B8B code?

Common symptoms may include reduced engine power, warning lights on the dashboard (such as the check engine light), decreased fuel efficiency, or the hybrid system not functioning optimally.

What could cause the P0B8B code to trigger?

Causes may include a faulty battery management system, issues with the battery pack itself, corroded connections, or wiring problems within the 17 circuit.

How can I diagnose the P0B8B code?

Use an OBDII scanner to read the code and check for any related codes. Inspect the battery connections, wiring, and components associated with the hybrid system to identify any visible issues.

Is it safe to drive my Cadillac with a P0B8B code?

While it may be safe to drive short distances, it is advisable to address the issue promptly, as driving with this code can lead to further damage to the hybrid system or reduced performance.

What repairs are commonly needed for the P0B8B code?

Repairs may involve replacing or repairing the battery management system, fixing wiring issues, or replacing damaged connections within the circuit associated with the hybrid battery.

Can I reset the P0B8B code myself?

You can attempt to reset the code using an OBDII scanner, but if the underlying issue is not resolved, the code will likely return. It's best to diagnose and fix the cause before resetting.

How much will it cost to fix the P0B8B code?

Repair costs can vary widely depending on the specific issue, ranging from a simple wiring repair costing a few hundred dollars to a more extensive battery replacement costing several thousand dollars.

Should I take my Cadillac to a dealership or an independent mechanic for the P0B8B code?

Both options can be viable, but a dealership may have more specialized knowledge of hybrid systems. Independent mechanics may offer more competitive pricing, so choose based on your comfort level and local options.