AutoCodes – Buick – P1FDC Buick

P1FDC Buick Code - Hybrid/EV Battery Interface Control Module 8 Voltage Sensor Circuit Low Voltage

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: P1FDC Buick indicates Hybrid/EV Battery Interface Control Module 8 Voltage Sensor Circuit Low Voltage.
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 830

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 P1FDC 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 P1FDC Buick - Hybrid/EV Battery Interface Control Module 8 Voltage Sensor Circuit Low Voltage - AutoCodes.com — P1FDC Buick Code - Hybrid/EV Battery Interface Control Module 8 Voltage Sensor Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1FDC 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 P1FDC 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 P1FDC 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 P1FDC Buick Code

1. What does the OBDII code P1FDC mean on a Buick?

P1FDC indicates a problem with the Hybrid/EV Battery Interface Control Module 8, specifically a low voltage detected in the voltage sensor circuit.

2. What are the common symptoms of a P1FDC code?

Symptoms may include an illuminated check engine light, reduced fuel efficiency, decreased hybrid system performance, or the vehicle entering limp mode.

3. What causes the P1FDC code to be triggered?

Common causes include a faulty voltage sensor, loose or corroded electrical connections, damaged wiring, or a malfunctioning Hybrid/EV Battery Interface Control Module.

4. Can I still drive my Buick with a P1FDC code?

Driving with a P1FDC code is not recommended, as it may lead to reduced vehicle performance or further damage to the hybrid system.

5. How is the P1FDC code diagnosed?

A technician will use a scan tool to verify the code, inspect the voltage sensor circuit and connections, and perform tests on the Hybrid/EV Battery Interface Control Module.

6. What repairs can fix the P1FDC code?

Repairs may include replacing the faulty voltage sensor, repairing or replacing damaged wiring, cleaning corroded connections, or replacing the control module if necessary.

7. How much does it cost to fix a P1FDC code on a Buick?

Repair costs can vary widely, ranging from $100-$300 for wiring or sensor repairs to $1,000 or more if the control module needs replacement.

8. Can a low hybrid battery cause the P1FDC code?

A weak or failing hybrid battery itself does not usually cause this code, but issues in the battery circuit or its sensors can trigger it.

9. Will clearing the P1FDC code fix the problem?

Clearing the code will temporarily turn off the warning light, but the underlying issue must be resolved to prevent the code from returning.

10. Is the P1FDC code unique to Buick vehicles?

No, the P1FDC code can appear on other hybrid or EV vehicles using similar systems, but diagnostics and repairs may vary depending on the manufacturer.