AutoCodes – Generic – P1B9A

P1B9A 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 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 919

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

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

What does this mean?

What are the Possible Causes of the DTC P1B9A?

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

How to Fix the DTC P1B9A?

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 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 P1B9A code?

Need more information on how to fix the P1B9A code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1B9A code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1B9A Buick — Hybrid/Electric Vehicle Battery 61 Circuit Low Voltage
P1B9A Cadillac — Hybrid/Electric Vehicle Battery 61 Circuit Low Voltage
P1B9A Chevrolet — Hybrid/Electric Vehicle Battery 61 Circuit Low Voltage
P1B9A GMC — Hybrid/Electric Vehicle Battery 61 Circuit Low Voltage
P1B9A Saturn — Hybrid/Electric Vehicle Battery 61 Circuit Low 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 P1B9A Code

1. What are the common symptoms of OBDII code P1B9A (Hybrid/Electric Vehicle Battery 61 Circuit Low Voltage)?

- Common symptoms of this code may include reduced electric vehicle range, poor performance, and potential warning lights on the dashboard.

2. What are the possible causes of OBDII code P1B9A?

- Possible causes of this code can include issues with the hybrid/electric vehicle battery, low voltage in the 61 circuit, damaged wiring, or faulty battery management system components.

3. How can I diagnose OBDII code P1B9A?

- Diagnosing this code typically involves using a diagnostic scan tool to read the code and check the voltage levels in the hybrid/electric vehicle battery system. It may also require inspecting the wiring and relevant components for any signs of damage.

4. Can driving with OBDII code P1B9A cause further damage to the vehicle?

- Continuing to drive with this code may lead to further deterioration of the battery system and potentially impact the performance and longevity of the hybrid/electric vehicle components.

5. How can I repair OBDII code P1B9A?

- Repairing this code often involves addressing the underlying cause, which may include replacing damaged wiring, repairing connections, or replacing faulty components in the hybrid/electric vehicle battery system.

6. Is it safe to drive my vehicle with OBDII code P1B9A?

- It is not recommended to drive the vehicle with this code present, as it can affect the performance and reliability of the hybrid/electric vehicle system. It's best to address the issue promptly.

7. Are there any DIY repair tips for OBDII code P1B9A?

- DIY repair for this code may be challenging due to the complexity of the hybrid/electric vehicle system. It's advisable to consult a professional mechanic or specialized technician for proper diagnosis and repair.

8. How much does it cost to fix OBDII code P1B9A?

- The cost of repairing this code can vary depending on the specific underlying issue, parts needed for replacement, and labor costs. It's recommended to obtain an estimate from a qualified technician.

9. Can OBDII code P1B9A be intermittent?

- Yes, this code can sometimes be intermittent, especially if the issue is related to a loose connection or sporadic voltage fluctuations in the hybrid/electric vehicle battery system.

10. Will resetting the OBDII code P1B9A make it go away permanently?

- Simply resetting the code without addressing the underlying issue will not make it go away permanently. It's crucial to diagnose and repair the root cause to prevent the code from reoccurring.