AutoCodes – Buick – P1FE5 Buick

P1FE5 Buick Code - Hybrid/EV Battery Interface Control Module 7 Voltage Sensor Circuit High 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: P1FE5 Buick indicates Hybrid/EV Battery Interface Control Module 7 Voltage Sensor Circuit High 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 807

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 P1FE5 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 P1FE5 Buick - Hybrid/EV Battery Interface Control Module 7 Voltage Sensor Circuit High Voltage - AutoCodes.com — P1FE5 Buick Code - Hybrid/EV Battery Interface Control Module 7 Voltage Sensor Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1FE5 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 P1FE5 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 P1FE5 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 P1FE5 Buick Code

1. What does OBDII code P1FE5 mean on a Buick?

P1FE5 indicates a "Hybrid/EV Battery Interface Control Module 7 Voltage Sensor Circuit High Voltage," meaning the voltage sensor in the battery interface module is detecting higher-than-expected voltage levels.

2. What are the common symptoms of code P1FE5 on a Buick?

Symptoms may include an illuminated check engine light, limited hybrid or EV system performance, reduced fuel efficiency, or difficulty charging the battery.

3. What causes the P1FE5 code to appear in a Buick?

Common causes include a faulty voltage sensor, a wiring issue in the circuit, a malfunctioning battery interface control module, or high resistance in the battery connections.

4. Is it safe to drive a Buick with the P1FE5 code?

Driving with this code is not recommended, as it could indicate a high-voltage issue that may compromise the hybrid or EV system's performance and safety.

5. How do you diagnose the P1FE5 code on a Buick?

Diagnosis involves scanning for codes, checking the voltage sensor circuit for damage or loose connections, testing the battery interface control module, and verifying high-voltage system integrity.

6. Can a software update fix the P1FE5 code on a Buick?

In some cases, a software update for the hybrid/EV system may resolve the issue if it is caused by a programming glitch. Consult a dealership for confirmation.

7. How much does it cost to repair the P1FE5 code on a Buick?

Repair costs vary depending on the root cause, ranging from $100 for simple wiring repairs to $1,000 or more for module replacement.

8. Can a dead hybrid/EV battery trigger the P1FE5 code?

While unlikely, a severely degraded or improperly connected hybrid/EV battery could contribute to voltage sensor errors and trigger this code.

9. How can I prevent the P1FE5 code from recurring on my Buick?

Regular maintenance, including inspecting the high-voltage system, ensuring battery connections are secure, and addressing any warning signs promptly, can help prevent this code.

10. Should I take my Buick to a dealership for the P1FE5 code?

Yes, since the P1FE5 code involves the high-voltage system, itâ€™s best to have a certified technician or dealership handle the diagnosis and repair for safety reasons.