AutoCodes – Cadillac – P1FEF Cadillac

P1FEF Cadillac 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 Cadillac 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 718

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

What does this mean?

What are the Possible Causes of the DTC P1FEF Cadillac?

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 Cadillac?

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 Cadillac 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 Cadillac Code

What does the OBDII code P1FEF mean for my Cadillac?

The code P1FEF indicates a problem with the Hybrid/EV Battery Interface Control Module 7 Voltage Sensor Performance, which means the voltage sensor is not functioning properly.

What are the common symptoms of the P1FEF code?

Common symptoms include warning lights on the dashboard, reduced hybrid system performance, and possible issues with battery charging or discharging.

What can cause the P1FEF code to trigger?

The code can be triggered by faulty voltage sensors, wiring issues, poor connections, or problems within the Hybrid/EV Battery Interface Control Module itself.

How can I diagnose the P1FEF code in my Cadillac?

You can diagnose the P1FEF code by using an OBDII scanner to read the code and any related codes, then inspecting the voltage sensors and wiring for damage or corrosion.

Are there any common repairs for the P1FEF code?

Common repairs include replacing faulty voltage sensors, repairing or replacing damaged wiring, or reprogramming the Hybrid/EV Battery Interface Control Module if needed.

Will driving with the P1FEF code set cause damage to my vehicle?

While it may not cause immediate damage, driving with this code can lead to reduced hybrid performance and potential long-term issues with the battery system.

How much will it cost to fix the P1FEF code?

Repair costs can vary widely depending on the specific issue, but expect to pay for diagnostics, parts, and labor, which can range from a few hundred to over a thousand dollars.

Can I clear the P1FEF code without fixing the problem?

While you can clear the code with an OBDII scanner, the issue will likely return until the underlying problem is addressed.

Should I take my Cadillac to a dealership for P1FEF code repairs?

While a dealership has specific expertise with Cadillac vehicles, a qualified independent mechanic with experience in hybrid systems can also effectively diagnose and repair the issue.