AutoCodes – Buick – P1FD6 Buick

P1FD6 Buick Code - Hybrid/EV Battery Interface Control Module 2 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: P1FD6 Buick indicates Hybrid/EV Battery Interface Control Module 2 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 847

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 P1FD6 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 P1FD6 Buick - Hybrid/EV Battery Interface Control Module 2 Voltage Sensor Circuit Low Voltage - AutoCodes.com — P1FD6 Buick Code - Hybrid/EV Battery Interface Control Module 2 Voltage Sensor Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1FD6 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 P1FD6 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 P1FD6 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 P1FD6 Buick Code

1. What does the OBDII code P1FD6 mean on a Buick?

The P1FD6 code indicates a "Hybrid/EV Battery Interface Control Module 2 Voltage Sensor Circuit Low Voltage," meaning the control module has detected a low voltage issue in one of the hybrid battery's monitoring circuits.

2. What are the common symptoms of the P1FD6 code on a Buick?

Common symptoms include warning lights on the dashboard, reduced fuel economy, limited hybrid or EV functionality, or the vehicle entering a limp mode.

3. What causes the P1FD6 code on a Buick?

Possible causes include a faulty voltage sensor, damaged wiring or connectors in the battery interface circuit, a malfunctioning battery control module, or internal issues within the hybrid battery pack.

4. Can I drive my Buick with the P1FD6 code?

It is not recommended to drive with this code, as it may indicate a serious issue with the hybrid battery system, potentially leading to further damage or safety concerns.

5. How is the P1FD6 code diagnosed on a Buick?

A technician will use a scan tool to read the trouble codes, inspect the voltage sensor circuit for wiring or connector issues, and test the battery control module for proper operation.

6. How do you fix the P1FD6 code on a Buick?

Repairs may include replacing the faulty voltage sensor, repairing or replacing damaged wiring or connectors, reprogramming or replacing the battery control module, or addressing issues within the hybrid battery pack.

7. Is the P1FD6 code specific to Buick hybrid or EV models?

Yes, this code is specific to Buick hybrid or electric vehicles and pertains to their high-voltage battery systems.

8. How much does it cost to repair the P1FD6 code on a Buick?

Repair costs can vary widely depending on the exact issue, ranging from $100-$300 for wiring repairs to over $1,000 if the battery control module or hybrid battery requires replacement.

9. Can a dead 12V auxiliary battery trigger the P1FD6 code on a Buick?

While unlikely, issues with the 12V auxiliary battery or its connections can sometimes contribute to hybrid system errors and should be inspected as part of the diagnosis.

10. What should I do if the P1FD6 code returns after repairs?

If the code reappears, have the vehicle re-inspected to check for additional issues, such as intermittent wiring faults, incorrect installation of components, or deeper problems within the hybrid battery system.