AutoCodes – Generic – P1B87

P1B87 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 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 7,039

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

What does this mean?

What are the Possible Causes of the DTC P1B87?

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

How to Fix the DTC P1B87?

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 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

P1B87 Buick — Hybrid/Electric Vehicle Battery 55 Circuit Performance
P1B87 Cadillac — Hybrid/Electric Vehicle Battery 55 Circuit Performance
P1B87 Chevrolet — Hybrid/Electric Vehicle Battery 55 Circuit Performance
P1B87 GMC — Hybrid/Electric Vehicle Battery 55 Circuit Performance
P1B87 Saturn — Hybrid/Electric Vehicle Battery 55 Circuit Performance

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 Code

1. What does the OBDII code P1B87 mean?

The P1B87 code indicates an issue with the performance of the Hybrid/Electric Vehicle Battery 55 Circuit, often related to monitoring or communication with a specific battery module.

2. What are the common symptoms of the P1B87 code?

Symptoms may include the hybrid system warning light, reduced power or performance, limited electric-only mode, and potential failure to charge or discharge the battery properly.

3. What causes the P1B87 code to appear?

Common causes include a faulty battery module, damaged wiring or connectors in the battery circuit, a malfunctioning battery management system, or issues with the hybrid control module.

4. Can I drive with the P1B87 code active?

It is generally not recommended to drive with this code active, as it may lead to reduced performance, potential damage to the hybrid battery, or system failure.

5. How is the P1B87 code diagnosed?

Diagnosis typically involves scanning for additional trouble codes, inspecting the battery module and related wiring, testing the battery management system, and verifying voltage and resistance in the affected circuit.

6. What repairs can fix the P1B87 code?

Repairs may include replacing a faulty battery module, repairing or replacing damaged wiring or connectors, reprogramming or replacing the battery management system, or addressing software updates for the hybrid control module.

7. How much does it cost to repair the P1B87 code?

Repair costs can vary widely, ranging from $200 for minor wiring repairs to over $1,000 for battery module replacement, depending on the vehicle and extent of the issue.

8. Can a weak 12V battery cause the P1B87 code?

While unlikely, a weak 12V battery can sometimes contribute to hybrid system issues. Itâ€™s best to check and rule out the 12V battery before proceeding with more complex repairs.

9. Is the P1B87 code specific to certain vehicle models?

This code is typically found in hybrid or electric vehicles from manufacturers like Toyota, Honda, Chevrolet, and others, but the exact meaning and repair steps may vary by model.

10. Can clearing the P1B87 code solve the problem?

Clearing the code without addressing the underlying issue is not a permanent solution, as the code will likely return if the root cause is not resolved.