AutoCodes – Cadillac – P0B86 Cadillac

P0B86 Cadillac Code - Hybrid/Electric Vehicle Battery 16 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: P0B86 Cadillac indicates Hybrid/Electric Vehicle Battery 16 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 916

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 P0B86 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 P0B86 Cadillac - Hybrid/Electric Vehicle Battery 16 Circuit - AutoCodes.com — P0B86 Cadillac Code - Hybrid/Electric Vehicle Battery 16 Circuit

What does this mean?

What are the Possible Causes of the DTC P0B86 Cadillac?

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

How to Fix the DTC P0B86 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 P0B86 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 P0B86 Cadillac Code

1. What does the OBDII code P0B86 mean on a Cadillac?

P0B86 indicates an issue with the Hybrid/Electric Vehicle Battery 16 Circuit, which typically refers to a specific cell, group of cells, or wiring in the battery system.

2. What are the common symptoms of code P0B86 on a Cadillac?

Symptoms may include reduced fuel efficiency, limited power output, warning lights on the dashboard (like the Check Engine Light or hybrid system alert), and possible failure to start.

3. What causes the P0B86 code to appear?

This code can be caused by a faulty battery cell, corroded or damaged wiring, poor connections, a failed battery control module, or software issues in the vehicle's control system.

4. Is it safe to drive a Cadillac with the P0B86 code?

Driving with this code is not recommended, as it can lead to further damage to the hybrid/electric system and may leave the vehicle stranded if the battery system fails completely.

5. How do you diagnose the P0B86 code?

Diagnosis involves using a scan tool to access the hybrid system data, inspecting the battery pack and related wiring for damage or corrosion, and testing the affected circuit for continuity and voltage.

6. Can a weak 12V battery cause the P0B86 code?

While unlikely, a weak 12V battery can sometimes trigger hybrid system errors. However, P0B86 is more specific to the high-voltage battery system.

7. How much does it cost to repair the P0B86 code on a Cadillac?

Repair costs vary widely depending on the issue, ranging from $200 for wiring repairs to over $3,000 if the high-voltage battery needs replacement.

8. Can the P0B86 code be fixed without replacing the battery?

Yes, if the issue is related to wiring, connectors, or a control module, repairs may not require replacing the entire battery pack.

9. What tools are needed to troubleshoot the P0B86 code?

A professional-grade OBDII scan tool capable of reading hybrid system data, a multimeter for electrical testing, and access to the vehicle's service manual are typically required.

10. Can software updates resolve the P0B86 code?

In some cases, a software update for the battery control module or hybrid system may resolve the issue, but this is less common than physical repairs.