AutoCodes – Generic – P1BAC

P1BAC Code - Hybrid/Electric Vehicle Battery 67 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: P1BAC indicates Hybrid/Electric Vehicle Battery 67 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 2,763

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 P1BAC 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 P1BAC - Hybrid/Electric Vehicle Battery 67 Circuit Low Voltage - AutoCodes.com — P1BAC Code - Hybrid/Electric Vehicle Battery 67 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1BAC?

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

How to Fix the DTC P1BAC?

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 P1BAC 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 P1BAC code?

Need more information on how to fix the P1BAC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1BAC code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1BAC Buick — Hybrid/Electric Vehicle Battery 67 Circuit Low Voltage
P1BAC Cadillac — Hybrid/Electric Vehicle Battery 67 Circuit Low Voltage
P1BAC Chevrolet — Hybrid/Electric Vehicle Battery 67 Circuit Low Voltage
P1BAC GMC — Hybrid/Electric Vehicle Battery 67 Circuit Low Voltage
P1BAC Saturn — Hybrid/Electric Vehicle Battery 67 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 P1BAC Code

1. What are common symptoms of OBDII code P1BAC (Hybrid/Electric Vehicle Battery 67 Circuit Low Voltage)?

Common symptoms include reduced vehicle performance, poor fuel efficiency, and potential issues with the hybrid/electric system.

2. What can cause the OBDII code P1BAC to appear?

The code P1BAC typically indicates a low voltage condition in the circuit related to Hybrid/Electric Vehicle Battery 67, which can be caused by a faulty battery, damaged wiring, or a failing battery management system.

3. How serious is the OBDII code P1BAC (Hybrid/Electric Vehicle Battery 67 Circuit Low Voltage)?

While the code itself may not cause immediate danger, it can lead to performance issues and potentially affect the overall functionality of the hybrid/electric system. It is recommended to address this code promptly.

4. Can I continue driving with the OBDII code P1BAC present?

It is not advisable to continue driving with the code P1BAC as it can lead to further damage to the hybrid/electric system. It is best to address the issue as soon as possible.

5. What are some DIY repair tips for fixing OBDII code P1BAC?

DIY repair tips may include checking the battery connections, inspecting the wiring for any visible damage, and ensuring the battery management system is functioning properly. However, it is recommended to seek professional help for an accurate diagnosis and repair.

6. How can I prevent OBDII code P1BAC from appearing again?

Regular maintenance of the hybrid/electric vehicle battery, including checking the voltage levels and ensuring proper connections, can help prevent the recurrence of the code P1BAC.

7. Is it safe to reset the OBDII code P1BAC without addressing the underlying issue?

Resetting the code without fixing the root cause may temporarily clear the error code, but the underlying issue will persist and may lead to more significant problems in the future. It is important to diagnose and repair the issue properly.

8. How can a professional mechanic diagnose the OBDII code P1BAC?

A professional mechanic may use specialized diagnostic tools to check the voltage levels in the Hybrid/Electric Vehicle Battery 67 circuit, inspect the battery and related components for any faults, and perform a thorough analysis to pinpoint the exact cause of the low voltage condition.

9. What are the potential costs associated with repairing OBDII code P1BAC?

The repair costs for OBDII code P1BAC can vary depending on the extent of the issue, the parts that need to be replaced, and the labor involved. It is recommended to obtain multiple quotes from reputable mechanics to compare and make an informed decision.

10. Can OBDII code P1BAC affect the overall performance of a hybrid/electric vehicle?

Yes, the OBDII code P1BAC indicating a low voltage condition in the Hybrid/Electric Vehicle Battery 67 circuit can impact the overall performance of a hybrid/electric vehicle, leading to decreased efficiency and potential system malfunctions.