AutoCodes – Cadillac – P1B9B Cadillac

P1B9B Cadillac 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 Cadillac 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 825

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

What does this mean?

What are the Possible Causes of the DTC P1B9B Cadillac?

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

How to Fix the DTC P1B9B 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 P1B9B 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 P1B9B Cadillac Code

1. What are the common symptoms of OBDII code P1B9B in a Cadillac Hybrid/Electric Vehicle?

- Common symptoms include reduced fuel efficiency, difficulty starting the vehicle, and the illumination of the check engine light.

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

- This code is usually triggered by issues such as a faulty high voltage battery, damaged wiring, or a malfunctioning battery control module.

3. How can I diagnose the OBDII code P1B9B in my Cadillac Hybrid/Electric Vehicle?

- Diagnosis typically involves using a diagnostic scanner to retrieve the specific code, inspecting the high voltage battery and related components, and testing the circuit for any faults.

4. What are the potential risks of driving with the OBDII code P1B9B present in a Cadillac Hybrid/Electric Vehicle?

- Driving with this code can lead to further damage to the hybrid/electric vehicle system and may result in unsafe driving conditions. It is recommended to address the issue promptly.

5. Can I repair the OBDII code P1B9B in my Cadillac Hybrid/Electric Vehicle on my own?

- While some enthusiasts may attempt to diagnose and repair this issue themselves, it is recommended to seek professional assistance due to the complex nature of hybrid/electric vehicle systems.

6. How much does it typically cost to repair the OBDII code P1B9B in a Cadillac Hybrid/Electric Vehicle?

- Repair costs can vary depending on the exact cause of the code, but they may range from a few hundred to a few thousand dollars, especially if high voltage battery components need to be replaced.

7. Are there any preventive maintenance tips to avoid triggering the OBDII code P1B9B in a Cadillac Hybrid/Electric Vehicle?

- Regularly servicing the high voltage battery system, checking for any signs of wear or damage, and following the manufacturer's maintenance schedule can help prevent such issues.

8. Can the OBDII code P1B9B be intermittent or sporadic in a Cadillac Hybrid/Electric Vehicle?

- Yes, this code can sometimes appear intermittently, especially if the underlying issue is related to a loose connection or intermittent fault in the high voltage circuit.

9. How long can I safely drive my Cadillac Hybrid/Electric Vehicle with the OBDII code P1B9B before getting it repaired?

- It is advisable to address the issue as soon as possible to prevent further damage to the vehicle's hybrid/electric system. Continuously driving with this code present may lead to more severe problems.

10. Is it safe to clear the OBDII code P1B9B in a Cadillac Hybrid/Electric Vehicle using a diagnostic scanner?

- Clearing the code may temporarily turn off the check engine light, but it is crucial to diagnose and address the underlying issue causing the code to prevent future problems and ensure the vehicle's safety.