AutoCodes – Cadillac – P1FE9 Cadillac

P1FE9 Cadillac Code - Hybrid/EV Battery Interface Control Module 1 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: P1FE9 Cadillac indicates Hybrid/EV Battery Interface Control Module 1 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 765

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 P1FE9 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 P1FE9 Cadillac - Hybrid/EV Battery Interface Control Module 1 Voltage Sensor Performance - AutoCodes.com — P1FE9 Cadillac Code - Hybrid/EV Battery Interface Control Module 1 Voltage Sensor Performance

What does this mean?

What are the Possible Causes of the DTC P1FE9 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 P1FE9 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 P1FE9 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.

Need more information about the P1FE9 Cadillac code?

Need more information on how to fix the P1FE9 Cadillac code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1FE9 Cadillac code diagnosed by a professional: Find a repair shop in your area

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 P1FE9 Cadillac Code

1. What are the common symptoms of OBDII code P1FE9 in a Cadillac related to the Hybrid/EV Battery Interface Control Module 1 Voltage Sensor?

- Common symptoms include poor fuel economy, reduced hybrid system performance, and potential issues with the vehicle's electric propulsion system.

2. What are some possible causes of OBDII code P1FE9 in a Cadillac indicating an issue with the Hybrid/EV Battery Interface Control Module 1 Voltage Sensor?

- Causes may include a faulty voltage sensor, wiring issues, a malfunctioning control module, or problems with the hybrid battery itself.

3. How can I diagnose the OBDII code P1FE9 in my Cadillac related to the Hybrid/EV Battery Interface Control Module 1 Voltage Sensor?

- Diagnosis typically involves using a scan tool to read the code, checking the voltage sensor and related wiring for faults, and testing the control module and battery system components.

4. Is it safe to continue driving my Cadillac with an active OBDII code P1FE9 related to the Hybrid/EV Battery Interface Control Module 1 Voltage Sensor?

- It is recommended to address the issue promptly to prevent further damage to the hybrid system. Continued driving with this code may lead to decreased performance and potential safety concerns.

5. What are some repair tips for fixing OBDII code P1FE9 in a Cadillac indicating a problem with the Hybrid/EV Battery Interface Control Module 1 Voltage Sensor?

- Repair may involve replacing the faulty voltage sensor, repairing any damaged wiring, reprogramming the control module, or addressing any underlying issues with the hybrid battery system.

6. Can a DIY enthusiast attempt to fix OBDII code P1FE9 in a Cadillac related to the Hybrid/EV Battery Interface Control Module 1 Voltage Sensor?

- While some basic diagnosis and repairs may be possible for experienced DIYers, dealing with hybrid and electric vehicle systems can be complex and dangerous. It is recommended to seek professional assistance for such issues.

7. How much does it typically cost to repair OBDII code P1FE9 in a Cadillac indicating an issue with the Hybrid/EV Battery Interface Control Module 1 Voltage Sensor?

- Repair costs can vary depending on the specific cause of the code and the extent of the damage. Costs may range from a few hundred to over a thousand dollars, including parts and labor.

8. Are there any preventive maintenance steps I can take to avoid encountering OBDII code P1FE9 related to the Hybrid/EV Battery Interface Control Module 1 Voltage Sensor in my Cadillac?

- Regularly inspecting and maintaining the hybrid system components, ensuring proper charging habits, and addressing any warning signs promptly can help prevent issues leading to this code.