AutoCodes – Chevrolet – P1B9B Chevrolet

P1B9B Chevrolet Code - Hybrid/Electric Vehicle Battery 61 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: P1B9B Chevrolet indicates Hybrid/Electric Vehicle Battery 61 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 796

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 P1B9B Chevrolet 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 P1B9B Chevrolet - Hybrid/Electric Vehicle Battery 61 Circuit High Voltage - AutoCodes.com — P1B9B Chevrolet Code - Hybrid/Electric Vehicle Battery 61 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1B9B Chevrolet?

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

How to Fix the DTC P1B9B Chevrolet?

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 P1B9B Chevrolet 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 P1B9B Chevrolet Code

1. What are the common symptoms of OBDII code P1B9B Chevrolet Hybrid/Electric Vehicle Battery 61 Circuit High Voltage?

- Common symptoms include the Check Engine light illuminating, reduced hybrid/electric vehicle performance, and potential issues with the battery system.

2. What can cause the OBDII code P1B9B Chevrolet Hybrid/Electric Vehicle Battery 61 Circuit High Voltage?

- Possible causes include a faulty high voltage battery, damaged wiring or connectors in the circuit, or issues with the battery management system.

3. How serious is the OBDII code P1B9B Chevrolet Hybrid/Electric Vehicle Battery 61 Circuit High Voltage?

- This code indicates a problem with the high voltage circuit in the hybrid/electric vehicle battery system, which can be serious if not addressed promptly. It is recommended to have it diagnosed and repaired by a qualified technician.

4. Can I drive my vehicle with the OBDII code P1B9B Chevrolet Hybrid/Electric Vehicle Battery 61 Circuit High Voltage?

- It is not recommended to drive the vehicle with this code present, as it can lead to further damage to the high voltage battery system and potentially pose a safety risk. Have the issue addressed as soon as possible.

5. How can I diagnose and repair the OBDII code P1B9B Chevrolet Hybrid/Electric Vehicle Battery 61 Circuit High Voltage?

- Diagnosis typically involves using a scan tool to check for the specific fault code and then inspecting the high voltage battery system, wiring, and connectors for any visible damage. Repair may involve replacing a faulty battery component or repairing damaged wiring.

6. Are there any safety precautions to take when working on the high voltage system related to OBDII code P1B9B?

- Yes, it is crucial to follow proper safety procedures when working on high voltage systems. Ensure the vehicle is powered off, wear insulated gloves and tools, and refer to manufacturer guidelines for handling high voltage components.

7. Can a DIY enthusiast fix the OBDII code P1B9B Chevrolet Hybrid/Electric Vehicle Battery 61 Circuit High Voltage?

- Due to the complexity and safety considerations involved in working on high voltage systems, it is recommended to have this issue diagnosed and repaired by a professional technician with experience in hybrid/electric vehicles.

8. How much does it typically cost to repair the OBDII code P1B9B Chevrolet Hybrid/Electric Vehicle Battery 61 Circuit High Voltage?

- The cost of repair can vary depending on the exact cause of the issue and the extent of the damage. It is advisable to get a diagnostic assessment from a qualified technician to determine the cost accurately.

9. Will resetting the OBDII code P1B9B Chevrolet Hybrid/Electric Vehicle Battery 61 Circuit High Voltage make it go away permanently?

- Resetting the code may temporarily turn off the Check Engine light, but if the underlying issue causing the fault code is not addressed, it is likely to return. It is essential to diagnose and repair the root cause of the problem.

10. How often does the OBDII code P1B9B Chevrolet Hybrid/Electric Vehicle Battery 61 Circuit High Voltage occur in hybrid/electric vehicles?

- While not extremely common, this code can occur in hybrid/electric vehicles due to issues with the high voltage battery system. Proper maintenance and timely inspections can help prevent such faults.