AutoCodes – Generic – P1BB9

P1BB9 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 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 1,542

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

What does this mean?

What are the Possible Causes of the DTC P1BB9?

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

How to Fix the DTC P1BB9?

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 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 P1BB9 code?

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Need Help with the Code?

Get the P1BB9 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1BB9 Buick — Hybrid/Electric Vehicle Battery 71 Circuit High Voltage
P1BB9 Cadillac — Hybrid/Electric Vehicle Battery 71 Circuit High Voltage
P1BB9 Chevrolet — Hybrid/Electric Vehicle Battery 71 Circuit High Voltage
P1BB9 GMC — Hybrid/Electric Vehicle Battery 71 Circuit High Voltage
P1BB9 Saturn — Hybrid/Electric Vehicle Battery 71 Circuit High 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 P1BB9 Code

1. What does the OBDII code P1BB9 mean?

The P1BB9 code indicates a "Hybrid/Electric Vehicle Battery 71 Circuit High Voltage," which refers to an issue with the voltage levels in a specific circuit of the hybrid or electric vehicle's battery pack.

2. What are the common symptoms of the P1BB9 code?

Symptoms may include an illuminated check engine or hybrid system warning light, reduced hybrid or EV performance, decreased fuel efficiency, or the inability for the vehicle to switch between electric and gas modes.

3. What causes the P1BB9 code to appear?

Common causes include a faulty battery module, a damaged or corroded wiring harness, a defective battery control module, or electrical short circuits within the battery circuitry.

4. Can I continue driving with the P1BB9 code?

While the vehicle may still operate, driving with this code can lead to reduced performance and potential damage to the hybrid battery system. Itâ€™s best to address the issue as soon as possible.

5. How is the P1BB9 code diagnosed?

A technician will use a scan tool to confirm the code, inspect the battery and associated wiring for damage or corrosion, and test voltage levels in the affected circuit.

6. What repairs are needed to fix the P1BB9 code?

Repairs may include replacing the faulty battery module, repairing or replacing damaged wiring, or reprogramming or replacing the battery control module if necessary.

7. How much does it cost to fix the P1BB9 code?

Repair costs vary depending on the root cause, ranging from $200 for minor wiring fixes to $1,000 or more for battery module replacement.

8. Can a weak 12V battery trigger the P1BB9 code?

While unlikely, a weak 12V battery can sometimes cause voltage irregularities, so itâ€™s worth checking and ensuring the auxiliary battery is in good condition.

9. Is the P1BB9 code covered under warranty?

If your vehicleâ€™s hybrid or EV battery is still under warranty, repairs related to this code may be covered. Check with your manufacturer or dealership for details.

10. Can a DIY fix resolve the P1BB9 code?

DIY repairs are not recommended for this code due to the high voltage systems involved. Always consult a qualified technician for safe and accurate diagnosis and repair.