AutoCodes – Generic – P1FE9

P1FE9 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 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.

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Code Popularity 861

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

What does this mean?

What are the Possible Causes of the DTC P1FE9?

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?

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 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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Information for Specific Makes

P1FE9 Buick — Hybrid/EV Battery Interface Control Module 1 Voltage Sensor Performance
P1FE9 Cadillac — Hybrid/EV Battery Interface Control Module 1 Voltage Sensor Performance
P1FE9 Chevrolet — Hybrid/EV Battery Interface Control Module 1 Voltage Sensor Performance
P1FE9 GMC — Hybrid/EV Battery Interface Control Module 1 Voltage Sensor Performance
P1FE9 Saturn — Hybrid/EV Battery Interface Control Module 1 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 P1FE9 Code

1. What are common symptoms of OBDII code P1FE9?

- Common symptoms include reduced hybrid/EV system performance, decreased fuel efficiency, and potential issues with the battery interface control module.

2. What can cause the OBDII code P1FE9 to trigger?

- The code P1FE9 may be triggered by a faulty hybrid/EV battery interface control module, issues with the voltage sensor, wiring problems, or software glitches.

3. How can I diagnose the cause of OBDII code P1FE9?

- Diagnosis typically involves using an OBDII scanner to read the code, conducting voltage tests on the battery interface control module, checking the wiring for any damage, and ensuring software is up to date.

4. Is it safe to continue driving with OBDII code P1FE9 present?

- It is not recommended to continue driving with the code P1FE9 present, as it can lead to further damage to the hybrid/EV system and potentially compromise vehicle safety.

5. Can I repair OBDII code P1FE9 myself?

- Repairing OBDII code P1FE9 may require advanced knowledge and specialized tools. It is recommended to seek assistance from a qualified technician or dealership.

6. How much does it typically cost to repair OBDII code P1FE9?

- The cost of repairing OBDII code P1FE9 can vary depending on the underlying cause. It is advisable to get a diagnostic from a professional to determine the exact cost.

7. Are there any preventive maintenance tips to avoid OBDII code P1FE9?

- Regular maintenance of the hybrid/EV system, including checking battery health and keeping software updated, can help prevent issues leading to code P1FE9.

8. Can a low hybrid/EV battery level trigger OBDII code P1FE9?

- Yes, a low hybrid/EV battery level can potentially trigger OBDII code P1FE9 if it causes abnormal voltage readings or performance issues in the battery interface control module.

9. Will resetting the OBDII code P1FE9 make it go away permanently?

- Resetting the code may temporarily clear it, but if the underlying issue is not resolved, the code is likely to reappear. It is important to diagnose and address the root cause of the problem.

10. How urgent is it to address OBDII code P1FE9?

- It is recommended to address OBDII code P1FE9 as soon as possible to prevent further damage to the hybrid/EV system and ensure optimal vehicle performance.