AutoCodes – Generic – P1BCB

P1BCB Code - Hybrid/Electric Vehicle Battery 77 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: P1BCB indicates Hybrid/Electric Vehicle Battery 77 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 846

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 P1BCB 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 P1BCB - Hybrid/Electric Vehicle Battery 77 Circuit High Voltage - AutoCodes.com — P1BCB Code - Hybrid/Electric Vehicle Battery 77 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1BCB?

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

How to Fix the DTC P1BCB?

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 P1BCB 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.

Need more information about the P1BCB code?

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Need Help with the Code?

Get the P1BCB code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1BCB Buick — Hybrid/Electric Vehicle Battery 77 Circuit High Voltage
P1BCB Cadillac — Hybrid/Electric Vehicle Battery 77 Circuit High Voltage
P1BCB Chevrolet — Hybrid/Electric Vehicle Battery 77 Circuit High Voltage
P1BCB GMC — Hybrid/Electric Vehicle Battery 77 Circuit High Voltage
P1BCB Saturn — Hybrid/Electric Vehicle Battery 77 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 P1BCB Code

1. What does the OBDII code P1BCB mean?

P1BCB indicates a high voltage issue in the Hybrid/Electric Vehicle Battery 77 Circuit, which typically relates to a specific cell or module in the high-voltage battery system.

2. What are the common symptoms of code P1BCB?

Symptoms include reduced hybrid or EV performance, warning lights on the dashboard (e.g., Check Engine Light or hybrid system warning), and possible limitations on electric-only operation.

3. What causes the P1BCB code to appear?

Common causes include a faulty battery module, loose or corroded electrical connections, malfunctioning battery management system (BMS), or wiring issues in the high-voltage circuit.

4. Can I drive my car with a P1BCB code?

Itâ€™s not recommended, as this code may indicate a serious issue with the high-voltage system, potentially leading to further damage or unsafe driving conditions.

5. How is the P1BCB code diagnosed?

A technician will use a scan tool to retrieve freeze frame data, inspect the battery pack and connections, and potentially perform voltage and resistance tests to pinpoint the issue.

6. What repairs are needed to fix code P1BCB?

Repairs may involve replacing a defective battery module, repairing or replacing damaged wiring, cleaning or tightening battery connections, or updating the battery management system software.

7. How much does it cost to fix a P1BCB code?

Costs vary widely depending on the vehicle and extent of the issue. Battery module repairs can range from a few hundred to several thousand dollars, depending on whether the entire pack needs replacement.

8. Can a P1BCB code be caused by environmental factors?

Yes, extreme temperatures or excessive vibration can impact battery performance and connections, potentially triggering this code.

9. Does a P1BCB code always mean the battery is bad?

Not necessarily. It could be caused by wiring or connection issues, or a fault in the battery management system, rather than the battery itself.

10. How can I prevent the P1BCB code from occurring?

Regular maintenance of the high-voltage battery system, ensuring tight and clean connections, and avoiding extreme operating conditions can help prevent this code from appearing.