AutoCodes – Buick – P1E9F Buick

P1E9F Buick Code - Hybrid/EV Battery Interface Control Module 3 5 V Reference Circuit

Quick Answer

The drive motor battery contains 288 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: P1E9F Buick indicates Hybrid/EV Battery Interface Control Module 3 5 V Reference Circuit.
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 897

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 24, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1E9F Buick Description

The drive motor battery contains 288 cells. Groups of three cells are welded together in parallel. There are a total of 96 cell groups in the drive motor battery assembly. These cell groups are electrically connected in-series. Each individual cell group is rated at 3.7 volts, for a nominal system voltage of 355 volts direct current. The battery cells are also grouped together into three sections. The first 90 cells/30 cell groups make up battery section one. This section is adjacent to the cowl and contains batteries 67 through to 96. Battery section two is located behind section one. It is made up of 72 cells/24 cell groups and contains batteries 43 through to 66. The transverse battery section is section number three, it is made up of the remaining 126 cells/42 cell groups and contains batteries 1 through to 42. The three battery sections are individually serviceable components.
The battery energy control module monitors the voltage of the 96 cell groups. 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 serviceable voltage sense harness joins this connector to a drive motor battery high-voltage interface control module, also located on the top surface of the battery section. The drive motor battery high-voltage interface control module encodes the voltage reading and transmits it to the battery energy control module through the battery control harness. There is one drive motor battery high-voltage interface control module located on battery sections one and two, and two drive motor battery high-voltage interface control modules associated with battery section three. The drive motor battery high-voltage interface control module, voltage sense harnesses, battery control harness and battery energy control module are all considered serviceable components.
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 hybrid/EV powertrain control module 2 through serial data. The hybrid/EV powertrain control module 2 is the host controller for diagnostic trouble code information.

OBDII Code P1E9F Buick - Hybrid/EV Battery Interface Control Module 3 5 V Reference Circuit - AutoCodes.com — P1E9F Buick Code - Hybrid/EV Battery Interface Control Module 3 5 V Reference Circuit

What does this mean?

What are the Possible Causes of the DTC P1E9F Buick?

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 P1E9F Buick?

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 P1E9F Buick 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 P1E9F Buick Code

1. What are common symptoms of the OBDII code P1E9F related to the Hybrid/EV Battery Interface Control Module 3 5 V Reference Circuit?

- Common symptoms include poor hybrid system performance, reduced fuel efficiency, and potential drivability issues.

2. What are possible causes of the OBDII code P1E9F in a Buick hybrid vehicle?

- Causes can include a faulty Hybrid/EV Battery Interface Control Module, damaged wiring or connectors in the 3.5 V reference circuit, or a malfunctioning battery pack.

3. How can I diagnose the OBDII code P1E9F in my Buick hybrid car?

- Proper diagnostic tools, such as an OBDII scanner, can help identify the specific issue. Additionally, thorough inspection of the hybrid system components and circuits is recommended.

4. Can I continue driving my Buick with the P1E9F trouble code present?

- It is not recommended to continue driving with this code active, as it can lead to further damage to the hybrid system and potentially unsafe driving conditions.

5. What are some repair tips for fixing the Hybrid/EV Battery Interface Control Module 3 5 V Reference Circuit issue?

- Repair tips may include checking and repairing any damaged wiring, replacing the faulty control module, and ensuring proper connection of all components in the circuit.

6. Is it safe to attempt DIY repairs for the P1E9F code in my Buick hybrid vehicle?

- While some basic troubleshooting steps can be done by DIY enthusiasts, complex repairs involving the hybrid system should be carried out by trained professionals to ensure safety and proper functioning.

7. How much does it typically cost to repair the Hybrid/EV Battery Interface Control Module 3 5 V Reference Circuit issue in a Buick?

- Repair costs can vary depending on the extent of the damage and the specific components that need to be replaced. It's best to consult with a mechanic for an accurate estimate.

8. Can resetting the OBDII system clear the P1E9F trouble code temporarily?

- Resetting the system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear once the problem resurfaces.

9. Are there any specific maintenance tasks that can help prevent the occurrence of the P1E9F code in a Buick hybrid vehicle?

- Regularly inspecting the hybrid system components, keeping up with scheduled maintenance, and addressing any warning signs promptly can help prevent issues leading to this trouble code.

10. How long does it typically take to repair the Hybrid/EV Battery Interface Control Module 3 5 V Reference Circuit issue?

- Repair times can vary depending on the complexity of the problem and the availability of parts. It's advisable to consult with a mechanic for an estimated repair time.