AutoCodes – Chevrolet – P1B9A Chevrolet

P1B9A Chevrolet Code - Hybrid/Electric Vehicle Battery 61 Circuit Low 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: P1B9A Chevrolet indicates Hybrid/Electric Vehicle Battery 61 Circuit Low 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 988

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 P1B9A 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 P1B9A Chevrolet - Hybrid/Electric Vehicle Battery 61 Circuit Low Voltage - AutoCodes.com — P1B9A Chevrolet Code - Hybrid/Electric Vehicle Battery 61 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B9A Chevrolet?

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

How to Fix the DTC P1B9A 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 P1B9A 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 P1B9A Chevrolet Code

1. What are the common symptoms of OBDII code P1B9A in a Chevrolet hybrid/electric vehicle?

- Common symptoms include reduced electric propulsion, poor fuel efficiency, and potential illumination of the check engine light.

2. What can cause the OBDII code P1B9A indicating Hybrid/Electric Vehicle Battery 61 Circuit Low Voltage in a Chevrolet?

- The code can be triggered by issues such as a faulty battery cell, damaged battery module, poor battery connection, or a problem with the battery management system.

3. How serious is the P1B9A code in a Chevrolet hybrid/electric vehicle?

- The code indicates a low voltage issue in the hybrid/electric vehicle battery system, which can affect the vehicle's performance and efficiency. It is important to address this issue promptly.

4. Can I continue driving my Chevrolet hybrid/electric vehicle with the P1B9A code present?

- It is not recommended to drive the vehicle with the P1B9A code present, as it can lead to further damage to the battery system and potentially cause more severe issues.

5. How can I diagnose and repair the P1B9A code in my Chevrolet hybrid/electric vehicle?

- Diagnosis typically involves inspecting the battery system for any visible damage or loose connections. Repair may involve replacing a faulty battery cell, module, or addressing issues with the battery management system.

6. Is it possible to reset the P1B9A code in a Chevrolet hybrid/electric vehicle without fixing the underlying issue?

- While it is possible to clear the code using an OBDII scanner, the underlying issue causing the code will persist unless properly diagnosed and repaired.

7. Are there any DIY tips for troubleshooting the P1B9A code in a Chevrolet hybrid/electric vehicle?

- DIY tips may include checking the battery connections for tightness, visually inspecting the battery for any signs of damage, and ensuring the vehicle is not experiencing any other electrical issues.

8. How long does it typically take to repair the P1B9A code in a Chevrolet hybrid/electric vehicle?

- The repair time can vary depending on the specific cause of the code and the extent of the repair needed. It is advisable to consult a qualified technician for an accurate assessment.

9. Can extreme weather conditions impact the occurrence of the P1B9A code in a Chevrolet hybrid/electric vehicle?

- Yes, extreme temperatures can affect the performance of the hybrid/electric vehicle battery system, potentially leading to voltage issues and triggering the P1B9A code.

10. Is the repair for the P1B9A code covered under warranty for Chevrolet hybrid/electric vehicles?

- Depending on the vehicle's warranty coverage and the specific circumstances, the repair for the P1B9A code may be covered under warranty. It is recommended to check with the dealership or manufacturer for more information.