AutoCodes – Cadillac – P1BF9 Cadillac

P1BF9 Cadillac 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 Cadillac 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 790

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

What does this mean?

What are the Possible Causes of the DTC P1BF9 Cadillac?

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

How to Fix the DTC P1BF9 Cadillac?

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 Cadillac 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 Cadillac Code

What does the OBDII code P1BF9 mean for my Cadillac?

The P1BF9 code indicates a performance issue with the 93 circuit related to the hybrid or electric vehicle battery.

What symptoms might I experience with the P1BF9 code?

Common symptoms include reduced engine performance, warning lights on the dashboard, and potential issues with hybrid system operation.

What could cause the P1BF9 code to appear?

Possible causes include a faulty battery management system, issues with wiring or connectors in the 93 circuit, or a malfunctioning battery pack.

How can I diagnose the P1BF9 code effectively?

Start by checking the vehicle's battery voltage, inspecting the wiring and connectors for damage, and using a scan tool to monitor the battery management system's performance.

What repairs might be needed to resolve the P1BF9 code?

Repairs could involve replacing damaged wiring or connectors, updating the vehicle's software, or replacing the hybrid battery if it is found to be defective.

Is it safe to drive my Cadillac if the P1BF9 code is present?

While it may be safe to drive, you should avoid heavy acceleration and monitor any warning lights. Itâ€™s best to have the vehicle checked as soon as possible.

Can I clear the P1BF9 code after repairs?

Yes, after making the necessary repairs, you can clear the code using an OBDII scanner, but itâ€™s important to ensure the underlying issue is resolved first.

Will the P1BF9 code affect fuel efficiency?

Yes, if the hybrid system is not functioning properly due to the P1BF9 code, it may lead to decreased fuel efficiency and increased emissions.

How much does it typically cost to fix the P1BF9 code?

Repair costs can vary widely depending on the specific issue but may range from a few hundred to several thousand dollars, especially if a battery replacement is needed.

Should I attempt to fix the P1BF9 code myself?

If you have experience with automotive repairs, you may attempt to diagnose the issue; however, for complex problems like hybrid battery issues, it's advisable to consult a professional mechanic.