AutoCodes – GMC – P1B9B GMC

P1B9B GMC 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 GMC 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 926

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

What does this mean?

What are the Possible Causes of the DTC P1B9B GMC?

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

How to Fix the DTC P1B9B GMC?

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 GMC 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 GMC Code

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

- Common symptoms include the hybrid/electric vehicle not starting, reduced driving range, and warning lights illuminated on the dashboard.

2. What can cause OBDII code P1B9B GMC to trigger?

- This code is typically triggered by issues with the high voltage circuit within the hybrid/electric vehicle battery system, such as a short circuit or high voltage leakage.

3. How serious is OBDII code P1B9B GMC?

- This code is considered serious as it directly relates to the high voltage system of the hybrid/electric vehicle, which can pose safety risks if not addressed promptly.

4. Can I drive my vehicle with OBDII code P1B9B GMC active?

- It is not recommended to drive the vehicle with this code active, as it can lead to further damage to the battery system and potentially unsafe driving conditions.

5. How do I diagnose and repair OBDII code P1B9B GMC?

- Diagnosis and repair of this code require specialized equipment and expertise in hybrid/electric vehicle systems. It is recommended to seek assistance from a qualified technician or dealership.

6. Will resetting the OBDII code P1B9B GMC make it go away permanently?

- Simply resetting the code without addressing the underlying issue will not make it go away permanently. The root cause of the problem needs to be identified and resolved.

7. Are there any DIY repair tips for OBDII code P1B9B GMC?

- Due to the complexity and safety considerations of hybrid/electric vehicle battery systems, it is not recommended for DIY repairs. Professional assistance is advised.

8. How much does it typically cost to fix OBDII code P1B9B GMC?

- The cost of fixing this code can vary depending on the extent of the issue and the specific repairs needed. It is recommended to obtain a diagnosis and repair estimate from a qualified technician.

9. Can OBDII code P1B9B GMC be caused by a faulty battery pack?

- Yes, a faulty battery pack can be a potential cause of this code, especially if there is a high voltage circuit issue within the battery system.

10. How can I prevent OBDII code P1B9B GMC from recurring in the future?

- Regular maintenance of the hybrid/electric vehicle battery system, such as checking for leaks, ensuring proper insulation, and following manufacturer guidelines, can help prevent this code from recurring.