AutoCodes – Cadillac – P1E9F Cadillac

P1E9F Cadillac 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 Cadillac 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 960

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

1. What are the common symptoms of OBDII code P1E9F in a Cadillac hybrid/EV?

- Common symptoms include illuminated check engine light, reduced hybrid/EV performance, and potential drivability issues.

2. What does the OBDII code P1E9F Cadillac indicate?

- The code P1E9F indicates a problem with the Hybrid/EV Battery Interface Control Module 3 5 V Reference Circuit.

3. What are the possible causes of OBDII code P1E9F in a Cadillac hybrid/EV?

- Possible causes include a faulty Hybrid/EV Battery Interface Control Module, wiring issues, or a malfunctioning 3.5 V reference circuit.

4. How can I diagnose the OBDII code P1E9F in my Cadillac hybrid/EV?

- Diagnosis typically involves using a diagnostic scanner to retrieve the code, inspecting the wiring for any damage, and testing the Hybrid/EV Battery Interface Control Module.

5. Can I continue driving my Cadillac with the OBDII code P1E9F?

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

6. How can I repair OBDII code P1E9F in my Cadillac hybrid/EV?

- Repair options may include replacing the faulty Hybrid/EV Battery Interface Control Module, repairing any damaged wiring, or addressing issues with the 3.5 V reference circuit.

7. Is it safe to attempt DIY repairs for OBDII code P1E9F in a Cadillac hybrid/EV?

- It is recommended to have a qualified technician diagnose and repair the issue, as working on hybrid/EV systems can be complex and dangerous without proper training.

8. How much does it cost to fix OBDII code P1E9F in a Cadillac hybrid/EV?

- The cost of repairs can vary depending on the exact cause of the issue, but it is advisable to budget for diagnostic fees, parts replacement, and labor costs.

9. Can a low or dead hybrid/EV battery cause the OBDII code P1E9F in a Cadillac?

- While a low or dead battery can potentially trigger related issues, the code P1E9F specifically pertains to the Hybrid/EV Battery Interface Control Module and its 3.5 V reference circuit.

10. How often does the OBDII code P1E9F Cadillac occur in hybrid/EV models?

- The occurrence of this specific code can vary depending on the model year and overall condition of the hybrid/EV system, but it is relatively uncommon compared to other OBDII codes.