AutoCodes – GMC – P1FEF GMC

P1FEF GMC 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 GMC 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.

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Code Popularity 777

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

What does this mean?

What are the Possible Causes of the DTC P1FEF GMC?

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 GMC?

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 GMC 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 P1FEF GMC Code

1. What are the common symptoms of OBDII code P1FEF in a GMC Hybrid/EV vehicle?

- Common symptoms include decreased fuel efficiency, loss of power, illuminated check engine light, and potential issues with the hybrid/EV system.

2. What is the likely cause of OBDII code P1FEF related to the Hybrid/EV Battery Interface Control Module 7 Voltage Sensor Performance in a GMC vehicle?

- The code P1FEF is often triggered by a malfunction in the Hybrid/EV Battery Interface Control Module 7 Voltage Sensor, which measures the voltage in the hybrid or electric vehicle's battery system.

3. How can I diagnose the issue causing OBDII code P1FEF in my GMC Hybrid/EV vehicle?

- Diagnosis typically involves using a diagnostic scanner to read the code, checking the voltage sensor's wiring and connections, and testing the voltage sensor itself for proper functioning.

4. What are the potential repair options for resolving OBDII code P1FEF in a GMC Hybrid/EV vehicle?

- Repair options may include replacing the Hybrid/EV Battery Interface Control Module 7 Voltage Sensor, repairing faulty wiring or connections, or recalibrating the sensor to ensure accurate voltage readings.

5. Is it safe to continue driving my GMC Hybrid/EV vehicle with OBDII code P1FEF present?

- It is not recommended to drive the vehicle with a persistent P1FEF trouble code, as it can indicate underlying issues with the hybrid/EV system that may lead to further damage or safety concerns.

6. Can a DIY enthusiast tackle the repair of OBDII code P1FEF in a GMC Hybrid/EV vehicle?

- While some simple tasks like checking connections or replacing components may be within reach for DIYers, diagnosing and repairing complex electrical issues like the Hybrid/EV Battery Interface Control Module 7 Voltage Sensor may require professional expertise.

7. Are there any preventive maintenance steps to avoid OBDII code P1FEF in a GMC Hybrid/EV vehicle?

- Regularly inspecting the hybrid/EV system components, keeping the battery system well-maintained, and addressing any issues promptly can help prevent the occurrence of code P1FEF and other related problems.

8. How long does it typically take to repair OBDII code P1FEF related to the Hybrid/EV Battery Interface Control Module 7 Voltage Sensor in a GMC vehicle?

- The repair time can vary depending on the exact cause of the code and the complexity of the repair needed. It may take a few hours to a full day for a professional technician to diagnose and fix the issue.

9. Are there any software updates or recalls related to OBDII code P1FEF in GMC Hybrid/EV vehicles?

- It is advisable to check with the manufacturer or authorized service centers for any available software updates or recalls specifically addressing the Hybrid/EV Battery Interface Control Module 7 Voltage Sensor Performance issue.

10. Can a faulty Hybrid/EV Battery Interface Control Module 7 Voltage Sensor cause other OBDII codes to appear in a GMC Hybrid/EV vehicle?

- Yes, a malfunctioning voltage sensor can disrupt the hybrid/EV system's performance, potentially triggering other related trouble codes in addition to P1FEF.