AutoCodes – GMC – P1BB9 GMC

P1BB9 GMC Code - Hybrid/Electric Vehicle Battery 71 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: P1BB9 GMC indicates Hybrid/Electric Vehicle Battery 71 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 813

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 P1BB9 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 P1BB9 GMC - Hybrid/Electric Vehicle Battery 71 Circuit High Voltage - AutoCodes.com — P1BB9 GMC Code - Hybrid/Electric Vehicle Battery 71 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1BB9 GMC?

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

How to Fix the DTC P1BB9 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 P1BB9 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 P1BB9 GMC Code

1. What are the common symptoms of OBDII code P1BB9 in a GMC hybrid/electric vehicle?

- Common symptoms include reduced fuel efficiency, loss of power, and the illumination of the check engine light.

2. What could cause the OBDII code P1BB9 in a GMC hybrid/electric vehicle?

- This code is typically triggered by issues such as a high voltage in the hybrid/electric vehicle battery 71 circuit.

3. How serious is the OBDII code P1BB9 in a GMC hybrid/electric vehicle?

- This code should be addressed promptly to prevent potential damage to the vehicle's electrical system and ensure optimal performance.

4. Can I continue driving my GMC hybrid/electric vehicle with the P1BB9 code present?

- It is not recommended to continue driving with this code active, as it can lead to further damage and potentially unsafe driving conditions.

5. How can I diagnose the OBDII code P1BB9 in my GMC hybrid/electric vehicle?

- A diagnostic scan tool can be used to retrieve the code and further diagnose the specific issue causing the high voltage in the battery 71 circuit.

6. What are some repair tips for fixing the P1BB9 code in a GMC hybrid/electric vehicle?

- Repair tips may include checking the battery 71 circuit for any loose connections, damaged wiring, or faulty components that may be causing the high voltage issue.

7. Should I attempt to repair the P1BB9 code in my GMC hybrid/electric vehicle myself?

- It is recommended to have this code diagnosed and repaired by a qualified technician with experience working on hybrid/electric vehicles to ensure proper diagnosis and repair.

8. How much does it typically cost to repair the OBDII code P1BB9 in a GMC hybrid/electric vehicle?

- Repair costs can vary depending on the underlying cause of the code, but it is advisable to budget for potential battery or circuitry repairs.

9. Can the OBDII code P1BB9 be a recurring issue in a GMC hybrid/electric vehicle?

- If the underlying cause of the code is not properly addressed, it can potentially recur, so thorough diagnosis and repair are crucial.

10. Are there any preventive maintenance tips to avoid triggering the OBDII code P1BB9 in a GMC hybrid/electric vehicle?

- Regularly inspecting the battery and electrical components, as well as following the manufacturer's recommended maintenance schedule, can help prevent issues that may lead to this code.