AutoCodes – Generic – P1BC9

P1BC9 Code - Hybrid/Electric Vehicle Battery 77 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: P1BC9 indicates Hybrid/Electric Vehicle Battery 77 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 1,118

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 P1BC9 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 P1BC9 - Hybrid/Electric Vehicle Battery 77 Circuit Performance - AutoCodes.com — P1BC9 Code - Hybrid/Electric Vehicle Battery 77 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P1BC9?

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

How to Fix the DTC P1BC9?

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 P1BC9 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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Information for Specific Makes

P1BC9 Buick — Hybrid/Electric Vehicle Battery 77 Circuit Performance
P1BC9 Cadillac — Hybrid/Electric Vehicle Battery 77 Circuit Performance
P1BC9 Chevrolet — Hybrid/Electric Vehicle Battery 77 Circuit Performance
P1BC9 GMC — Hybrid/Electric Vehicle Battery 77 Circuit Performance
P1BC9 Saturn — Hybrid/Electric Vehicle Battery 77 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 P1BC9 Code

1. What are common symptoms of OBDII code P1BC9 related to Hybrid/Electric Vehicle Battery 77 Circuit Performance?

- Common symptoms include decreased fuel efficiency, loss of power, and issues with starting the vehicle.

2. What are possible causes of OBDII code P1BC9 indicating Hybrid/Electric Vehicle Battery 77 Circuit Performance?

- Possible causes may include a faulty battery pack, damaged wiring, a malfunctioning battery management system, or issues with the hybrid/electric vehicle's control module.

3. How can I diagnose the OBDII code P1BC9 for Hybrid/Electric Vehicle Battery 77 Circuit Performance?

- Diagnosing this code typically involves using a diagnostic scanner to retrieve the specific fault codes, inspecting the battery pack and related components for physical damage, and testing the electrical connections for proper voltage.

4. What are the repair options for OBDII code P1BC9 related to Hybrid/Electric Vehicle Battery 77 Circuit Performance?

- Repair options may include replacing the battery pack, repairing damaged wiring, resetting the battery management system, or reprogramming the control module.

5. Can I continue driving my vehicle with OBDII code P1BC9 present?

- It is not recommended to continue driving the vehicle with this code present, as it can lead to further damage to the hybrid/electric vehicle's battery system and potentially cause safety issues.

6. How much does it typically cost to repair OBDII code P1BC9 for Hybrid/Electric Vehicle Battery 77 Circuit Performance?

- The cost of repair can vary depending on the specific cause of the code, but it may range from a few hundred to several thousand dollars, especially if the battery pack needs to be replaced.

7. Are there any preventive maintenance tips to avoid OBDII code P1BC9 for Hybrid/Electric Vehicle Battery 77 Circuit Performance?

- Regularly inspecting the battery pack, keeping the electrical connections clean and secure, and following the manufacturer's recommended maintenance schedule can help prevent issues leading to this code.

8. Is it safe to reset the OBDII code P1BC9 for Hybrid/Electric Vehicle Battery 77 Circuit Performance on my own?

- While you can attempt to clear the code using a diagnostic scanner, it is important to address the underlying cause first to prevent the code from reoccurring. If you are unsure, it is best to seek professional assistance.

9. Can extreme weather conditions affect the likelihood of OBDII code P1BC9 appearing for Hybrid/Electric Vehicle Battery 77 Circuit Performance?

- Yes, extreme temperatures, both hot and cold, can impact the performance of the hybrid/electric vehicle's battery system and potentially trigger this code. Proper storage and maintenance in such conditions are important.

10. Will OBDII code P1BC9 for Hybrid/Electric Vehicle Battery 77 Circuit Performance cause my vehicle to fail an emissions test?

- Yes, this code can indicate issues with the hybrid/electric vehicle's emissions system, which may lead to a failed emissions test. It is recommended to address the code promptly to ensure compliance.