AutoCodes – Generic – P1FEF

P1FEF Code - Hybrid/EV Battery Interface Control Module 7 Voltage Sensor Performance

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: P1FEF indicates Hybrid/EV Battery Interface Control Module 7 Voltage Sensor Performance.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 790

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1FEF 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 P1FEF - Hybrid/EV Battery Interface Control Module 7 Voltage Sensor Performance - AutoCodes.com — P1FEF Code - Hybrid/EV Battery Interface Control Module 7 Voltage Sensor Performance

What does this mean?

What are the Possible Causes of the DTC P1FEF?

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 P1FEF?

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 P1FEF 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.

Need more information about the P1FEF code?

Need more information on how to fix the P1FEF code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1FEF code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1FEF Buick — Hybrid/EV Battery Interface Control Module 7 Voltage Sensor Performance
P1FEF Cadillac — Hybrid/EV Battery Interface Control Module 7 Voltage Sensor Performance
P1FEF Chevrolet — Hybrid/EV Battery Interface Control Module 7 Voltage Sensor Performance
P1FEF GMC — Hybrid/EV Battery Interface Control Module 7 Voltage Sensor Performance
P1FEF Saturn — Hybrid/EV Battery Interface Control Module 7 Voltage Sensor Performance

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 P1FEF Code

1. What are the common symptoms of OBDII code P1FEF related to Hybrid/EV Battery Interface Control Module 7 Voltage Sensor Performance?

- Common symptoms include reduced hybrid/EV performance, decreased fuel efficiency, and potential issues with battery charging.

2. What are some possible causes of OBDII code P1FEF related to Hybrid/EV Battery Interface Control Module 7 Voltage Sensor Performance?

- Possible causes include faulty battery voltage sensors, wiring issues, software glitches, or problems with the hybrid/EV battery interface control module.

3. How can I diagnose OBDII code P1FEF related to Hybrid/EV Battery Interface Control Module 7 Voltage Sensor Performance?

- Diagnosis involves using a diagnostic scanner to read the code, checking the voltage sensor readings, inspecting the wiring for damage, and testing the battery interface control module.

4. Can I still drive my vehicle with OBDII code P1FEF related to Hybrid/EV Battery Interface Control Module 7 Voltage Sensor Performance?

- It is not recommended to drive the vehicle with this code present, as it can lead to further damage to the hybrid/EV system. It's best to address the issue promptly.

5. How can I repair OBDII code P1FEF related to Hybrid/EV Battery Interface Control Module 7 Voltage Sensor Performance?

- Repair may involve replacing faulty voltage sensors, repairing damaged wiring, updating software, or replacing the hybrid/EV battery interface control module.

6. Is it safe to reset the OBDII code P1FEF related to Hybrid/EV Battery Interface Control Module 7 Voltage Sensor Performance and continue driving?

- Resetting the code may temporarily clear the warning light, but it's important to address the underlying issue to prevent further problems with the hybrid/EV system.

7. Does OBDII code P1FEF related to Hybrid/EV Battery Interface Control Module 7 Voltage Sensor Performance affect the vehicle's overall performance?

- Yes, this code can impact the vehicle's performance by affecting the efficiency of the hybrid/EV system and potentially leading to reduced power output.

8. Are there any maintenance tips to prevent OBDII code P1FEF related to Hybrid/EV Battery Interface Control Module 7 Voltage Sensor Performance?

- Regular maintenance checks, including monitoring battery health and addressing any warning lights promptly, can help prevent issues related to this OBDII code.

9. How long does it typically take to repair OBDII code P1FEF related to Hybrid/EV Battery Interface Control Module 7 Voltage Sensor Performance?

- The repair time can vary depending on the specific cause of the issue, but it may take a few hours to a day to diagnose and fix the problem.

10. Can a DIY enthusiast fix OBDII code P1FEF related to Hybrid/EV Battery Interface Control Module 7 Voltage Sensor Performance?

- While some aspects of the repair may be DIY-friendly, dealing with high-voltage components in hybrid/EV systems can be dangerous, so it's recommended to seek professional help for this issue.