AutoCodes – Cadillac – P1B9A Cadillac

P1B9A Cadillac 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 Cadillac 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 751

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

What does this mean?

What are the Possible Causes of the DTC P1B9A Cadillac?

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

How to Fix the DTC P1B9A Cadillac?

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 Cadillac 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 Cadillac Code

1. What are the common symptoms of OBDII code P1B9A in a Cadillac Hybrid/Electric Vehicle?

- Common symptoms include reduced battery performance, difficulty starting the vehicle, and warning lights on the dashboard related to the battery.

2. What can cause the OBDII code P1B9A in a Cadillac Hybrid/Electric Vehicle?

- The code P1B9A typically indicates low voltage in the Hybrid/Electric Vehicle Battery 61 circuit, which can be caused by a faulty battery, damaged wiring, or issues with the battery management system.

3. How serious is the OBDII code P1B9A in a Cadillac Hybrid/Electric Vehicle?

- The code P1B9A should be addressed promptly to prevent further damage to the vehicle's battery and related components. Ignoring the issue can lead to performance issues and potential safety hazards.

4. Can I continue driving my Cadillac with the OBDII code P1B9A present?

- It is not recommended to continue driving the vehicle with the code P1B9A active, as it can lead to further damage to the battery system and potentially leave you stranded if the battery fails.

5. How can I diagnose the OBDII code P1B9A in my Cadillac Hybrid/Electric Vehicle?

- Proper diagnosis of the code P1B9A requires using a diagnostic scanner to read the code and inspecting the battery, wiring, and battery management system for any visible damage or issues.

6. What are some repair tips for fixing the OBDII code P1B9A in a Cadillac Hybrid/Electric Vehicle?

- Repair tips may include checking and replacing the battery if necessary, inspecting and repairing any damaged wiring, and resetting the battery management system to clear the code.

7. Is it possible to reset the OBDII code P1B9A in a Cadillac Hybrid/Electric Vehicle without repairs?

- While you can clear the code temporarily by resetting the system, it is crucial to address the underlying issue causing the low voltage in the battery circuit to prevent the code from reoccurring.

8. Can extreme weather conditions affect the occurrence of the OBDII code P1B9A in a Cadillac Hybrid/Electric Vehicle?

- Yes, extreme temperatures can impact battery performance and potentially trigger the code P1B9A. It is essential to monitor the battery in both hot and cold weather conditions.

9. How can regular maintenance help prevent the OBDII code P1B9A in a Cadillac Hybrid/Electric Vehicle?

- Regular maintenance, including checking the battery's health, keeping the wiring in good condition, and following the manufacturer's maintenance schedule, can help prevent issues leading to the code P1B9A.

10. Are there any recalls or technical service bulletins related to the OBDII code P1B9A in Cadillac Hybrid/Electric Vehicles?

- It is recommended to check with a Cadillac dealership or the manufacturer's website for any recalls or technical service bulletins related to the code P1B9A to see if there are known issues or remedies available.