AutoCodes – Buick – P1FC8 Buick

P1FC8 Buick Code - Hybrid/EV Battery Interface Control Module 10 5 V Reference Circuit

Quick Answer

The hybrid battery contains 192 individual cells. 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: P1FC8 Buick indicates Hybrid/EV Battery Interface Control Module 10 5 V Reference 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 801

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 P1FC8 Buick Description

The hybrid battery contains 192 individual cells. Two cells are welded together in parallel and called a cell group. There are a total of 96 cell groups in the hybrid battery 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 cell groups are joined to form 3 distinct sections. The first 24 battery cell groups make up battery section 1. This section is adjacent to the cowl and contains battery cell groups 73 through 96. The next 28 battery cell groups make up battery section 2. This section is located behind section 1 and contains battery cell groups 45 through 72. The transverse battery section is section number 3 and it contains the remaining 44 battery cell groups 1 through 44. The battery sections also contain two temperature sensors, with one sensor located at each end of the section.
The battery energy control module monitors the voltage of the 96 battery cell groups. The voltage sense lines are attached to each individual cell group, and these sense lines terminate at a connector located on the top surface of the battery section. A voltage sense harness joins this connector to the battery energy control module.
The battery energy control module contains internal interface control modules that monitor specific cell groups.
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 the hybrid powertrain control module 2 through serial data. The hybrid powertrain control module 2 is the host controller for diagnostic trouble code information.

OBDII Code P1FC8 Buick - Hybrid/EV Battery Interface Control Module 10 5 V Reference Circuit - AutoCodes.com — P1FC8 Buick Code - Hybrid/EV Battery Interface Control Module 10 5 V Reference Circuit

What does this mean?

What are the Possible Causes of the DTC P1FC8 Buick?

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 P1FC8 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 P1FC8 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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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 P1FC8 Buick Code

1. What does the OBDII code P1FC8 mean on a Buick?

P1FC8 indicates an issue with the Hybrid/EV Battery Interface Control Module 10's 5V reference circuit, which is responsible for providing consistent voltage to certain hybrid/EV battery sensors.

2. What are the common symptoms of a P1FC8 code on a Buick?

Symptoms may include illuminated warning lights (such as the check engine or hybrid system light), reduced hybrid system performance, or the vehicle entering a limp mode.

3. What causes the P1FC8 code to appear on a Buick?

Common causes are wiring issues (shorts or opens), a faulty Hybrid/EV Battery Interface Control Module, damaged sensors relying on the 5V reference circuit, or a poor electrical connection.

4. Can I drive my Buick if it has a P1FC8 code?

Driving with this code is not recommended as it may lead to reduced hybrid functionality, potential safety risks, and further damage to the hybrid/EV system.

5. How is the P1FC8 code diagnosed?

Technicians typically use a scan tool to check for related codes, inspect the 5V reference circuit wiring and connectors, and test the Hybrid/EV Battery Interface Control Module and associated sensors.

6. How do I fix the P1FC8 code on my Buick?

Repairs may involve fixing or replacing damaged wiring, cleaning or securing connectors, replacing a faulty control module, or addressing any related sensor issues.

7. How much does it cost to repair a P1FC8 code on a Buick?

Repair costs can vary widely depending on the specific issue, but replacing a Hybrid/EV Battery Interface Control Module could cost between $500 and $1,500, not including labor.

8. Can a low-voltage battery cause the P1FC8 code on a Buick?

While unlikely, a weak or failing 12V auxiliary battery can sometimes cause electrical issues that might indirectly trigger this code.

9. Is the P1FC8 code specific to Buicks?

No, the P1FC8 code can appear on other hybrid or electric vehicles with similar systems, but diagnostic and repair procedures may vary by manufacturer.

10. Will clearing the P1FC8 code fix the problem?

Clearing the code without addressing the underlying issue will not resolve the problem, and the code will likely return. Proper diagnosis and repair are necessary.