AutoCodes – Generic – P1E9F

P1E9F 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 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 787

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

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?

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 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

P1E9F Buick — Hybrid/EV Battery Interface Control Module 3 5 V Reference Circuit
P1E9F Cadillac — Hybrid/EV Battery Interface Control Module 3 5 V Reference Circuit
P1E9F Chevrolet — Hybrid/EV Battery Interface Control Module 3 5 V Reference Circuit
P1E9F GMC — Hybrid/EV Battery Interface Control Module 3 5 V Reference Circuit

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 Code

What does the OBDII code P1E9F mean?

1. P1E9F indicates an issue with the 5V reference circuit for the Hybrid/EV Battery Interface Control Module 3, which is responsible for monitoring and managing the hybrid or EV battery system. 2.

What are common symptoms of the P1E9F code?

Symptoms may include the check engine light turning on, reduced vehicle performance, limited EV mode operation, or issues with the hybrid battery charging system. 3.

What causes the P1E9F code to appear?

Common causes include a faulty Hybrid/EV Battery Interface Control Module 3, damaged wiring or connectors in the 5V reference circuit, or a short or open circuit in the electrical system. 4.

Can I continue driving with a P1E9F code?

It is not recommended to drive extensively with this code, as it may lead to further damage to the hybrid/EV battery system or reduced vehicle performance. 5.

How do I diagnose the P1E9F code?

Diagnosis involves using a scan tool to confirm the code, inspecting the 5V reference circuit wiring and connectors for damage, and testing the Hybrid/EV Battery Interface Control Module 3 for proper operation. 6.

Is the P1E9F code specific to certain vehicles?

Yes, this code typically applies to hybrid or electric vehicles from manufacturers like General Motors (GM), but itâ€™s essential to consult your vehicle-specific service manual. 7.

How do I fix the P1E9F code?

Repairs may include replacing or repairing damaged wiring or connectors, recalibrating the control module, or replacing the Hybrid/EV Battery Interface Control Module 3 if it is defective. 8.

Can a weak hybrid battery trigger the P1E9F code?

While a weak hybrid battery itself may not directly cause this code, it could contribute to related issues in the 5V reference circuit or the control moduleâ€™s performance. 9.

How much does it cost to repair the P1E9F code?

Repair costs vary depending on the issue, but replacing the Hybrid/EV Battery Interface Control Module 3 can cost several hundred dollars, plus labor. 10.

Can I clear the P1E9F code myself?

You can clear the code with an OBDII scanner, but if the underlying issue isnâ€™t resolved, the code will likely return. Always address the root cause before clearing codes.