AutoCodes – Generic – P1B8C

P1B8C Code - Hybrid/Electric Vehicle Battery 56 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: P1B8C indicates Hybrid/Electric Vehicle Battery 56 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 1,066

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 P1B8C 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 P1B8C - Hybrid/Electric Vehicle Battery 56 Circuit High Voltage - AutoCodes.com — P1B8C Code - Hybrid/Electric Vehicle Battery 56 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1B8C?

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

How to Fix the DTC P1B8C?

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 P1B8C 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 P1B8C code?

Need more information on how to fix the P1B8C code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1B8C code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1B8C Buick — Hybrid/Electric Vehicle Battery 56 Circuit High Voltage
P1B8C Cadillac — Hybrid/Electric Vehicle Battery 56 Circuit High Voltage
P1B8C Chevrolet — Hybrid/Electric Vehicle Battery 56 Circuit High Voltage
P1B8C GMC — Hybrid/Electric Vehicle Battery 56 Circuit High Voltage
P1B8C Saturn — Hybrid/Electric Vehicle Battery 56 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 P1B8C Code

1. What are the common symptoms of OBDII code P1B8C (Hybrid/Electric Vehicle Battery 56 Circuit High Voltage)?

Symptoms may include the illumination of the check engine light, reduced hybrid system performance, and potential issues with the high-voltage battery.

2. What could cause the OBDII code P1B8C to trigger?

The code P1B8C may be triggered by a high-voltage circuit fault in the hybrid/electric vehicle's battery system, such as a wiring issue or a problem with a specific battery cell.

3. How serious is the OBDII code P1B8C (Hybrid/Electric Vehicle Battery 56 Circuit High Voltage)?

This code should be addressed promptly as it indicates a potential fault in the high-voltage circuit of the vehicle's battery system, which could affect overall performance and safety.

4. Can I continue driving my hybrid/electric vehicle with the P1B8C code present?

It is not recommended to drive the vehicle with the P1B8C code active, as it could lead to further damage to the high-voltage battery system and potentially compromise the safety of the vehicle.

5. What are some possible repair tips for fixing the OBDII code P1B8C?

Repair tips may include checking the wiring connections in the high-voltage circuit, inspecting the battery cells for any issues, and consulting a professional technician for a thorough diagnosis.

6. How can I diagnose the OBDII code P1B8C on my hybrid/electric vehicle?

Diagnosis of the P1B8C code typically involves using a compatible OBDII scanner to retrieve the specific fault code, inspecting the high-voltage battery system, and conducting electrical tests as needed.

7. Are there any safety precautions to consider when dealing with the P1B8C code?

When working on a hybrid/electric vehicle with the P1B8C code, it is essential to follow manufacturer safety guidelines, avoid contact with high-voltage components, and consider seeking assistance from a qualified professional.

8. Can a DIY enthusiast attempt to fix the OBDII code P1B8C at home?

While some basic checks like inspecting wiring connections can be done by DIY enthusiasts, dealing with high-voltage components and complex battery systems should be left to experienced technicians.

9. How much does it typically cost to repair the OBDII code P1B8C in a hybrid/electric vehicle?

The cost of repairing the P1B8C code can vary depending on the extent of the issue, the need for replacement parts, and labor costs. It is advisable to obtain estimates from reputable repair shops.

10. Is there a way to prevent the OBDII code P1B8C from reoccurring in the future?

Regular maintenance of the hybrid/electric vehicle's high-voltage battery system, prompt addressing of any warning lights or issues, and following manufacturer guidelines can help prevent the reoccurrence of the P1B8C fault code.