AutoCodes – Saturn – P1BAC Saturn

P1BAC Saturn 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 Saturn 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 1,016

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

What does this mean?

What are the Possible Causes of the DTC P1BAC Saturn?

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

How to Fix the DTC P1BAC Saturn?

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 Saturn 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 P1BAC Saturn Code

1. What does the OBDII code P1BAC mean on a Saturn?

P1BAC indicates a "Hybrid/Electric Vehicle Battery 67 Circuit Low Voltage," meaning thereâ€™s an issue with the voltage level in a specific portion of the hybrid or EV battery system.

2. What are the common symptoms of the P1BAC code?

Symptoms may include reduced fuel efficiency, limited electric drive capability, warning lights on the dashboard, or the vehicle entering limp mode.

3. What causes the P1BAC code to trigger?

The code can be caused by issues such as a weak or damaged HV battery cell, poor electrical connections, faulty wiring, or a malfunctioning battery control module.

4. Can a loose connection cause the P1BAC code?

Yes, loose or corroded connections in the battery system can result in low voltage readings and trigger the P1BAC code.

5. How is the P1BAC code diagnosed?

A technician will typically use a scan tool to read the code, inspect the battery system wiring and connections, and test individual battery cells for proper voltage.

6. Is it safe to drive with the P1BAC code?

Driving with this code can be risky, as it may result in reduced performance or further damage to the hybrid battery system. Itâ€™s best to address the issue promptly.

7. How do you fix the P1BAC code on a Saturn?

Repairs may include replacing faulty battery cells, repairing damaged wiring, cleaning or tightening electrical connections, or reprogramming the battery control module.

8. Can the P1BAC code be caused by a software issue?

Yes, in some cases, outdated or corrupted software in the battery control module can cause incorrect voltage readings and trigger this code.

9. How much does it cost to fix the P1BAC code?

Repair costs vary depending on the root cause but can range from a few hundred dollars for minor wiring repairs to several thousand dollars if the hybrid battery requires replacement.

10. Can clearing the P1BAC code fix the problem?

Clearing the code without addressing the underlying issue may temporarily turn off the warning light, but the problem will likely return and could cause further damage.