AutoCodes – Generic – P1B86

P1B86 Code - Hybrid/Electric Vehicle Battery 54 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: P1B86 indicates Hybrid/Electric Vehicle Battery 54 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 1,065

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 12, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1B86 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 P1B86 - Hybrid/Electric Vehicle Battery 54 Circuit High Voltage - AutoCodes.com — P1B86 Code - Hybrid/Electric Vehicle Battery 54 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1B86?

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

How to Fix the DTC P1B86?

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 P1B86 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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Need Help with the Code?

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Information for Specific Makes

P1B86 Buick — Hybrid/Electric Vehicle Battery 54 Circuit High Voltage
P1B86 Cadillac — Hybrid/Electric Vehicle Battery 54 Circuit High Voltage
P1B86 Chevrolet — Hybrid/Electric Vehicle Battery 54 Circuit High Voltage
P1B86 GMC — Hybrid/Electric Vehicle Battery 54 Circuit High Voltage
P1B86 Saturn — Hybrid/Electric Vehicle Battery 54 Circuit High Voltage

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 P1B86 Code

1. What are the common symptoms of OBDII code P1B86 related to the Hybrid/Electric Vehicle Battery 54 Circuit High Voltage?

- Common symptoms include poor fuel efficiency, loss of power, and potential issues with the hybrid or electric vehicle battery.

2. What are the possible causes of OBDII code P1B86 Hybrid/Electric Vehicle Battery 54 Circuit High Voltage?

- Possible causes may include a malfunctioning battery temperature sensor, high voltage circuit faults, or issues with the battery management system.

3. How can I diagnose the OBDII code P1B86 Hybrid/Electric Vehicle Battery 54 Circuit High Voltage?

- Diagnosis involves using a scan tool to retrieve the code, inspecting the battery connections, checking the battery voltage levels, and testing the battery components.

4. Can I still drive my vehicle with the OBDII code P1B86 present?

- It is not recommended to drive the vehicle with this code present, as it can lead to further damage to the hybrid or electric vehicle system.

5. How can I repair OBDII code P1B86 Hybrid/Electric Vehicle Battery 54 Circuit High Voltage?

- Repair may involve replacing faulty components like the battery temperature sensor, repairing high voltage circuits, or resetting the battery management system.

6. Are there any safety precautions to consider when dealing with this OBDII code?

- Safety precautions include wearing appropriate personal protective equipment, disconnecting the high voltage system before working on the battery, and following manufacturer guidelines.

7. How long does it typically take to repair OBDII code P1B86 Hybrid/Electric Vehicle Battery 54 Circuit High Voltage?

- Repair time can vary depending on the exact cause of the code, but it may take a few hours to a full day to diagnose and fix the issue.

8. Can I clear the OBDII code P1B86 on my own, or do I need a professional technician?

- Clearing the code can be done with a scan tool, but it is recommended to have a professional technician diagnose and repair the underlying issue to prevent further problems.

9. Will the OBDII code P1B86 reset itself after repairs are made?

- After repairs are made, the code may not reset itself immediately. A scan tool can be used to clear the code and ensure that the issue has been resolved.

10. How can I prevent OBDII code P1B86 Hybrid/Electric Vehicle Battery 54 Circuit High Voltage from occurring again?

- Regular maintenance of the hybrid or electric vehicle system, checking battery connections, and monitoring battery performance can help prevent this code from reoccurring.