AutoCodes – GMC – P1B87 GMC

P1B87 GMC Code - Hybrid/Electric Vehicle Battery 55 Circuit Performance

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: P1B87 GMC indicates Hybrid/Electric Vehicle Battery 55 Circuit Performance.
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 987

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 P1B87 GMC 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 P1B87 GMC - Hybrid/Electric Vehicle Battery 55 Circuit Performance - AutoCodes.com — P1B87 GMC Code - Hybrid/Electric Vehicle Battery 55 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P1B87 GMC?

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

How to Fix the DTC P1B87 GMC?

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 P1B87 GMC 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 P1B87 GMC Code

1. What are common symptoms of OBDII code P1B87 GMC related to Hybrid/Electric Vehicle Battery 55 Circuit Performance?

- Common symptoms include reduced hybrid battery performance, decreased fuel efficiency, and potential drivability issues.

2. What are the possible causes of OBDII code P1B87 GMC indicating Hybrid/Electric Vehicle Battery 55 Circuit Performance?

- Possible causes include faulty battery cells, issues with the battery management system, wiring problems, or a malfunctioning hybrid control module.

3. How can I diagnose the source of OBDII code P1B87 GMC for Hybrid/Electric Vehicle Battery 55 Circuit Performance?

- Diagnosis typically involves using a scan tool to retrieve the code, inspecting the hybrid battery system components, checking for loose connections, and conducting voltage tests.

4. Is it safe to continue driving with OBDII code P1B87 GMC related to Hybrid/Electric Vehicle Battery 55 Circuit Performance?

- It is not recommended to continue driving with this code as it can lead to further damage to the hybrid battery system and potentially cause safety risks.

5. What are some repair tips for addressing OBDII code P1B87 GMC for Hybrid/Electric Vehicle Battery 55 Circuit Performance?

- Repair tips may include replacing damaged battery cells, repairing wiring issues, recalibrating the hybrid battery system, or updating the control module software.

6. Can I reset OBDII code P1B87 GMC for Hybrid/Electric Vehicle Battery 55 Circuit Performance myself?

- While you can clear the code with a scan tool, it is important to address the underlying issue causing the code to prevent further damage to the hybrid battery system.

7. How much does it typically cost to repair OBDII code P1B87 GMC related to Hybrid/Electric Vehicle Battery 55 Circuit Performance?

- Repair costs can vary depending on the specific issue, but they may range from a few hundred to a few thousand dollars, especially if battery components need to be replaced.

8. Are there any maintenance practices to prevent OBDII code P1B87 GMC for Hybrid/Electric Vehicle Battery 55 Circuit Performance?

- Regularly inspecting the hybrid battery system, ensuring proper charging habits, and following manufacturer-recommended maintenance schedules can help prevent issues leading to this code.

9. Can extreme weather conditions affect OBDII code P1B87 GMC for Hybrid/Electric Vehicle Battery 55 Circuit Performance?

- Yes, extreme temperatures can impact the performance of hybrid batteries and may contribute to issues triggering this code.

10. Is professional assistance necessary to repair OBDII code P1B87 GMC indicating Hybrid/Electric Vehicle Battery 55 Circuit Performance?

- Due to the complexity of hybrid vehicle systems, seeking professional help from a certified technician with experience in hybrid vehicles is recommended for accurate diagnosis and repair.