AutoCodes – GMC – P1BF9 GMC

P1BF9 GMC Code - Hybrid/Electric Vehicle Battery 93 Circuit Performance

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: P1BF9 GMC indicates Hybrid/Electric Vehicle Battery 93 Circuit Performance.
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 808

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 P1BF9 GMC 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 P1BF9 GMC - Hybrid/Electric Vehicle Battery 93 Circuit Performance - AutoCodes.com — P1BF9 GMC Code - Hybrid/Electric Vehicle Battery 93 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P1BF9 GMC?

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

How to Fix the DTC P1BF9 GMC?

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 P1BF9 GMC 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 P1BF9 GMC Code

1. What does the OBDII code P1BF9 mean on a GMC vehicle?

P1BF9 indicates an issue with the Hybrid/Electric Vehicle Battery 93 Circuit Performance, often related to a specific cell or circuit in the high-voltage battery system.

2. What are the common symptoms of the P1BF9 code?

Symptoms may include a check engine light, reduced fuel efficiency, limited electric assist, or a warning message on the dash indicating a hybrid system fault.

3. What causes the P1BF9 code to appear on a GMC vehicle?

Common causes include a malfunctioning battery cell, poor wiring connections, damaged circuitry, or a failing hybrid battery control module.

4. Can I drive my GMC with the P1BF9 code active?

While it may still be drivable, continuing to drive with this code could lead to further damage or reduced hybrid system performance. It is best to address the issue promptly.

5. How is the P1BF9 code diagnosed?

Technicians use a scan tool to retrieve the code, inspect the battery pack and its circuits, and test the hybrid battery control module for faults.

6. What repairs might fix the P1BF9 code on a GMC vehicle?

Repairs can include replacing a defective battery cell, repairing damaged wiring, or replacing the hybrid battery control module if necessary.

7. Is the P1BF9 code covered under warranty?

The hybrid battery and related components may be covered under a manufacturerâ€™s extended warranty for hybrid systems. Check your vehicleâ€™s warranty terms.

8. Can a dead 12-volt battery cause the P1BF9 code?

A weak or dead 12-volt battery typically does not cause this code, but it can lead to other hybrid system issues. Ensure proper 12-volt battery function during diagnosis.

9. How much does it cost to fix the P1BF9 code on a GMC vehicle?

Repair costs vary widely depending on whether the issue is a single cell, wiring, or the control module. Repairs can range from a few hundred to several thousand dollars.

10. What should I do if the P1BF9 code keeps coming back?

If the code persists after repairs, have the system re-inspected to check for overlooked issues, such as hidden wiring damage or other faulty hybrid system components.