AutoCodes – Generic – P1BB5

P1BB5 Code - Hybrid/Electric Vehicle Battery 70 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: P1BB5 indicates Hybrid/Electric Vehicle Battery 70 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 1,660

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 P1BB5 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 P1BB5 - Hybrid/Electric Vehicle Battery 70 Circuit Low Voltage - AutoCodes.com — P1BB5 Code - Hybrid/Electric Vehicle Battery 70 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1BB5?

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

How to Fix the DTC P1BB5?

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 P1BB5 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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Need Help with the Code?

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Information for Specific Makes

P1BB5 Buick — Hybrid/Electric Vehicle Battery 70 Circuit Low Voltage
P1BB5 Cadillac — Hybrid/Electric Vehicle Battery 70 Circuit Low Voltage
P1BB5 Chevrolet — Hybrid/Electric Vehicle Battery 70 Circuit Low Voltage
P1BB5 GMC — Hybrid/Electric Vehicle Battery 70 Circuit Low Voltage
P1BB5 Saturn — Hybrid/Electric Vehicle Battery 70 Circuit Low 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 P1BB5 Code

1. What does OBDII code P1BB5 mean?

Code P1BB5 indicates a "Hybrid/Electric Vehicle Battery 70 Circuit Low Voltage," which means there is a low voltage issue detected in one of the battery circuits of a hybrid or electric vehicle.

2. What are the symptoms of code P1BB5?

Common symptoms include illuminated warning lights (such as the check engine light or hybrid system warning), reduced vehicle performance, poor fuel economy, and possible issues with charging or starting the vehicle.

3. What causes the P1BB5 code to appear?

Causes may include faulty battery pack sensors, damaged wiring or connectors in the battery circuit, a failing hybrid battery module, or issues within the battery management system (BMS).

4. Can I drive my vehicle with the P1BB5 code?

It is not recommended, as driving with this code may lead to further damage to the hybrid battery system or cause the vehicle to enter limp mode, reducing performance and reliability.

5. How do I diagnose the P1BB5 code?

Diagnosis typically involves using a scan tool to monitor battery voltage, inspecting the wiring and connectors for damage or corrosion, and testing the hybrid battery cells and related sensors.

6. What repairs can fix the P1BB5 code?

Repairs may include replacing damaged wiring, repairing or replacing faulty connectors, recalibrating or replacing the battery management system (BMS), or replacing the hybrid battery module if it is defective.

7. How much does it cost to fix the P1BB5 code?

Repair costs vary depending on the issue, ranging from $100 for wiring repairs to over $2,000 for hybrid battery replacement, depending on the vehicle make and model.

8. Can a low 12V battery cause the P1BB5 code?

While the 12V battery is separate from the hybrid system, a weak or failing 12V battery can sometimes cause communication errors or voltage inconsistencies that may trigger codes like P1BB5.

9. How can I prevent the P1BB5 code from occurring?

Regular maintenance of the hybrid battery system, including checking for corrosion, monitoring battery performance, and ensuring proper charging habits, can help prevent this code.

10. Do I need a professional to fix the P1BB5 code?

Yes, it is recommended to consult a professional mechanic or hybrid specialist, as diagnosing and repairing hybrid or electric vehicle battery systems requires specialized tools and expertise.