AutoCodes – Cadillac – P1FE8 Cadillac

P1FE8 Cadillac Code - Hybrid/EV Battery Interface Control Module 10 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: P1FE8 Cadillac indicates Hybrid/EV Battery Interface Control Module 10 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 708

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 P1FE8 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 P1FE8 Cadillac - Hybrid/EV Battery Interface Control Module 10 Voltage Sensor Circuit High Voltage - AutoCodes.com — P1FE8 Cadillac Code - Hybrid/EV Battery Interface Control Module 10 Voltage Sensor Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1FE8 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 P1FE8 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 P1FE8 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 P1FE8 Cadillac Code

1. What does the OBDII code P1FE8 mean on a Cadillac?

The code P1FE8 indicates a high voltage issue in the Hybrid/EV Battery Interface Control Module 10 Voltage Sensor Circuit.

2. What are the common symptoms of the P1FE8 code on a Cadillac?

Symptoms may include a check engine light, reduced hybrid or EV performance, limited battery charging, or difficulty starting the vehicle.

3. What causes the P1FE8 code to appear on a Cadillac?

The most common causes include a faulty voltage sensor, wiring or connector issues, or a malfunction in the Hybrid/EV Battery Interface Control Module.

4. Can a loose connector trigger the P1FE8 code?

Yes, a loose or corroded connector in the voltage sensor circuit can cause this code to be set.

5. Is it safe to drive a Cadillac with the P1FE8 code?

Driving with this code is not recommended, as it may lead to reduced vehicle performance or additional damage to the hybrid/EV system.

6. How is the P1FE8 code diagnosed?

A technician typically uses a scan tool to read data from the Hybrid/EV Battery Interface Control Module and performs visual inspections of the wiring, connectors, and voltage sensor.

7. What repairs are commonly needed for the P1FE8 code?

Repairs may include replacing the voltage sensor, fixing damaged wiring or connectors, or reprogramming the control module.

8. Can a failing hybrid/EV battery cause the P1FE8 code?

While rare, issues with the battery pack itself could potentially cause this code, but it is more often related to the sensor or its circuit.

9. How much does it cost to fix the P1FE8 code on a Cadillac?

Repair costs vary but typically range from $200 to $800, depending on whether the issue involves sensor replacement or more extensive electrical repairs.

10. Can clearing the P1FE8 code fix the problem?

Clearing the code may temporarily turn off the check engine light, but the underlying issue must be addressed to prevent the code from returning.