AutoCodes – Buick – P1FA9 Buick

P1FA9 Buick Code - Hybrid/EV Battery Interface Control Module 8 Not Programmed

Quick Answer

When the Battery Energy Control Module is flash programmed, the Hybrid/EV Battery Interface Control Module operating software and calibrations are provided to the Battery Energy Control Module. Common causes include Reprogram Hybrid/EV Battery Interface Control Module, Faulty Hybrid/EV Battery Interface Control Module, Hybrid/EV Battery Interface Control Module harness is open or shorted. 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: P1FA9 Buick indicates Hybrid/EV Battery Interface Control Module 8 Not Programmed.
Common causes: Common causes include Reprogram Hybrid/EV Battery Interface Control Module, Faulty Hybrid/EV Battery Interface Control Module, Hybrid/EV Battery Interface Control Module harness is open or shorted.
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 737

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 Apr 27, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1FA9 Buick Description

When the Battery Energy Control Module is flash programmed, the Hybrid/EV Battery Interface Control Module operating software and calibrations are provided to the Battery Energy Control Module. The Hybrid/EV Battery Interface Control Module software and calibrations are then loaded to each of the Hybrid/EV Battery Interface Control Modules from the Battery Energy Control Module. This operation is automatic and requires no operator action. At this point, if any of the Hybrid/EV Battery Interface Control Modules are not programmed correctly, the appropriate DTC is set.
This fault is internal to the Hybrid/EV Battery Interface Control Modules and no external circuits are involved.

OBDII Code P1FA9 Buick - Hybrid/EV Battery Interface Control Module 8 Not Programmed - AutoCodes.com — P1FA9 Buick Code - Hybrid/EV Battery Interface Control Module 8 Not Programmed

What does this mean?

What are the Possible Causes of the DTC P1FA9 Buick?

Reprogram Hybrid/EV Battery Interface Control Module
Faulty Hybrid/EV Battery Interface Control Module
Hybrid/EV Battery Interface Control Module harness is open or shorted
Hybrid/EV Battery Interface Control Module circuit poor electrical connection

How to Fix the DTC P1FA9 Buick?

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 P1FA9 Buick 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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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 P1FA9 Buick Code

1. What does the OBDII code P1FA9 mean on a Buick?

The P1FA9 code indicates that the Hybrid/EV Battery Interface Control Module 8 is not programmed or has incomplete programming.

2. What are the common symptoms of the P1FA9 code?

Symptoms may include a check engine light, limited hybrid or EV functionality, reduced performance, or failure to start in EV mode.

3. What causes the P1FA9 code on a Buick?

The code is typically caused by the control module not being programmed correctly after replacement or a failed software update.

4. Can I drive my Buick with the P1FA9 code?

Driving with this code is not recommended as it may limit hybrid/EV functionality or cause further damage to the battery system.

5. How do you fix the P1FA9 code?

The issue can usually be resolved by reprogramming or initializing the Hybrid/EV Battery Interface Control Module 8 using a dealership-level scan tool.

6. Is the P1FA9 code specific to Buicks only?

While it is common on Buicks, it can also appear on other GM vehicles with hybrid or EV systems using similar control modules.

7. Do I need to replace the control module to fix the P1FA9 code?

Not necessarily. The module may just need reprogramming, but in rare cases, a faulty module might require replacement.

8. What tools are needed to fix the P1FA9 code?

A dealership-level diagnostic scanner or a GM Tech 2 tool is required to program or reinitialize the control module.

9. How much does it cost to fix the P1FA9 code?

Costs can vary but typically range from $150 to $300 for reprogramming, depending on dealership labor rates.

10. Can a dead 12V battery cause the P1FA9 code?

A dead or disconnected 12V battery can sometimes lead to module communication errors, but the P1FA9 code specifically relates to improper programming. Reprogramming would still be necessary.