AutoCodes – Generic – P1BFD

P1BFD Code - Hybrid/Electric Vehicle Battery 94 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: P1BFD indicates Hybrid/Electric Vehicle Battery 94 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 1,111

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 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1BFD 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 P1BFD - Hybrid/Electric Vehicle Battery 94 Circuit Low Voltage - AutoCodes.com — P1BFD Code - Hybrid/Electric Vehicle Battery 94 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1BFD?

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

How to Fix the DTC P1BFD?

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 P1BFD 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

P1BFD Buick — Hybrid/Electric Vehicle Battery 94 Circuit Low Voltage
P1BFD Cadillac — Hybrid/Electric Vehicle Battery 94 Circuit Low Voltage
P1BFD Chevrolet — Hybrid/Electric Vehicle Battery 94 Circuit Low Voltage
P1BFD GMC — Hybrid/Electric Vehicle Battery 94 Circuit Low Voltage
P1BFD Saturn — Hybrid/Electric Vehicle Battery 94 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 P1BFD Code

1. What does OBDII code P1BFD mean?

Code P1BFD indicates a low voltage issue in the Hybrid/Electric Vehicle Battery 94 Circuit, often related to the battery management system.

2. What are the common symptoms of code P1BFD?

Symptoms may include an illuminated check engine light, reduced hybrid or EV performance, poor fuel efficiency, or the vehicle failing to switch to electric mode.

3. What causes code P1BFD to appear?

Common causes include a faulty battery cell, damaged wiring or connectors in the battery circuit, a malfunctioning battery management system, or low voltage in the hybrid battery.

4. Can I drive with code P1BFD active?

Itâ€™s not recommended to drive the vehicle with an active P1BFD code, as it could lead to further damage or reduced performance of the hybrid/electric system.

5. How is code P1BFD diagnosed?

A technician will typically use a scan tool to read the code, inspect the hybrid battery and its circuit for damage, test voltage levels, and check for loose or corroded connections.

6. What repairs can fix code P1BFD?

Repairs may include replacing a faulty battery cell, repairing or replacing damaged wiring, cleaning corroded connectors, or recalibrating the battery management system.

7. How much does it cost to fix code P1BFD?

The repair cost depends on the root cause, but it can range from $100 for wiring repairs to several thousand dollars if the hybrid battery needs replacement.

8. Can a weak 12V battery trigger code P1BFD?

While the 12V battery is separate from the hybrid battery, a weak or failing 12V battery could indirectly cause communication or voltage issues that trigger the code.

9. Will resetting the code fix the problem?

Simply resetting the code without addressing the underlying issue may temporarily clear the warning, but the code is likely to return until the problem is resolved.

10. How can I prevent code P1BFD from occurring?

Regular maintenance, checking battery health, and ensuring all wiring and connections in the hybrid system are secure and corrosion-free can help prevent this code.