AutoCodes – Chevrolet – P1FC9 Chevrolet

P1FC9 Chevrolet Code - Hybrid/EV Battery Interface Control Module 5 Cell Balancing Circuit

Quick Answer

To maintain a similar state of charge on the cell groups, the hybrid/EV powertrain control module 2 looks at the cell group voltages and determines which cell groups need energy removed in order to maintain the battery groups at a similar state of charge. Common causes include 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. 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: P1FC9 Chevrolet indicates Hybrid/EV Battery Interface Control Module 5 Cell Balancing Circuit.
Common causes: Common causes include 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.
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 1,102

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 P1FC9 Chevrolet Description

To maintain a similar state of charge on the cell groups, the hybrid/EV powertrain control module 2 looks at the cell group voltages and determines which cell groups need energy removed in order to maintain the battery groups at a similar state of charge. This is known as cell balancing. There is a transistor switched resistor wired in parallel with the cell group internal to the hybrid/EV battery interface control module portion of the battery energy control module. The hybrid/EV powertrain control module 2 sends a command to the hybrid/EV battery energy control module to begin cell balancing.

OBDII Code P1FC9 Chevrolet - Hybrid/EV Battery Interface Control Module 5 Cell Balancing Circuit - AutoCodes.com — P1FC9 Chevrolet Code - Hybrid/EV Battery Interface Control Module 5 Cell Balancing Circuit

What does this mean?

What are the Possible Causes of the DTC P1FC9 Chevrolet?

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 P1FC9 Chevrolet?

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 P1FC9 Chevrolet 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 P1FC9 Chevrolet Code

1. What does the OBDII code P1FC9 mean for a Chevrolet?

P1FC9 indicates an issue with the Hybrid/EV Battery Interface Control Module 5 Cell Balancing Circuit, suggesting a problem with battery cell balancing or monitoring.

2. What are the symptoms of a P1FC9 code?

Symptoms may include reduced fuel efficiency, limited EV mode operation, warning lights on the dashboard, or a noticeable drop in overall hybrid/EV performance.

3. What causes the P1FC9 code in Chevrolet vehicles?

Possible causes include a malfunctioning battery interface control module, damaged wiring or connectors, or an imbalance in the battery cells due to degradation or faults.

4. Can I drive my Chevrolet with a P1FC9 code?

Driving with this code is possible but not recommended, as it could lead to further battery damage or reduced vehicle performance over time.

5. How is the P1FC9 code diagnosed?

A technician will use a scan tool to read the code, inspect the battery interface control module, test the wiring and connectors, and evaluate the battery cell voltages to pinpoint the issue.

6. How do you fix a P1FC9 code in a Chevrolet?

Repairs may involve replacing the hybrid battery interface control module, repairing damaged wiring or connectors, or addressing issues with the battery cells themselves.

7. Can a weak battery cause a P1FC9 code?

Yes, a weak or degraded battery can cause an imbalance among the cells, triggering the P1FC9 code.

8. Is the P1FC9 code covered under warranty?

Coverage depends on your specific Chevrolet model, year, and warranty terms. Battery and hybrid system components may have extended coverage.

9. How much does it cost to fix a P1FC9 code?

Repair costs vary widely, from a few hundred dollars for wiring repairs to several thousand dollars if the battery or control module needs replacement.

10. How can I prevent the P1FC9 code from returning?

Regular maintenance, keeping the battery charged appropriately, and addressing hybrid system warnings promptly can help prevent this code from recurring.