AutoCodes – Cadillac – P1B86 Cadillac

P1B86 Cadillac 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 Cadillac 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 815

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 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 P1B86 Cadillac - Hybrid/Electric Vehicle Battery 54 Circuit High Voltage - AutoCodes.com — P1B86 Cadillac Code - Hybrid/Electric Vehicle Battery 54 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1B86 Cadillac?

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

How to Fix the DTC P1B86 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 P1B86 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 P1B86 Cadillac Code

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

- Common symptoms include reduced hybrid system performance, warning lights on the dashboard, and possible inability to start the vehicle.

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

- Possible causes include a faulty high voltage battery, issues with battery cell modules, damaged wiring or connectors, or a malfunctioning battery management system.

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

- Diagnosis typically involves using a specialized OBDII scanner to retrieve the code, inspecting the high voltage battery components, checking for loose connections, and performing voltage tests.

4. Can I continue driving my Cadillac with OBDII code P1B86 indicating Hybrid/Electric Vehicle Battery 54 Circuit High Voltage?

- It is not recommended to continue driving the vehicle with this code present, as it can lead to further damage to the hybrid system and potential safety hazards.

5. What are some repair tips for addressing OBDII code P1B86 Cadillac related to Hybrid/Electric Vehicle Battery 54 Circuit High Voltage?

- Repair tips may include checking and repairing any damaged wiring, replacing faulty battery components, resetting the battery management system, and ensuring proper connection of all battery modules.

6. Is it possible to reset OBDII code P1B86 Cadillac for Hybrid/Electric Vehicle Battery 54 Circuit High Voltage without addressing the underlying issue?

- While you may be able to clear the code temporarily, it is crucial to address the root cause to prevent the issue from recurring and potentially causing more significant problems.

7. How much does it typically cost to repair OBDII code P1B86 for Hybrid/Electric Vehicle Battery 54 Circuit High Voltage in a Cadillac?

- Repair costs can vary depending on the extent of the issue, but they may range from a few hundred to over a thousand dollars, especially if high voltage battery components need replacement.

8. Can a DIY enthusiast with automotive knowledge fix OBDII code P1B86 Cadillac for Hybrid/Electric Vehicle Battery 54 Circuit High Voltage?

- While some basic troubleshooting and inspections can be done by DIY enthusiasts, addressing high voltage battery issues should be left to professionals due to the potential safety risks involved.

9. How often does OBDII code P1B86 Cadillac for Hybrid/Electric Vehicle Battery 54 Circuit High Voltage occur in Cadillac vehicles?

- This code is relatively rare but can occur in Cadillac hybrid or electric vehicles experiencing issues with the high voltage battery system.

10. Are there any preventative measures to reduce the likelihood of encountering OBDII code P1B86 Cadillac for Hybrid/Electric Vehicle Battery 54 Circuit High Voltage?

- Regular maintenance of the high voltage battery system, such as checking for leaks, monitoring battery health, and addressing any warning signs promptly, can help prevent the occurrence of this code.