AutoCodes – Cadillac – P1E99 Cadillac

P1E99 Cadillac Code - Hybrid/EV Battery Interface Control Module 2 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: P1E99 Cadillac indicates Hybrid/EV Battery Interface Control Module 2 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 747

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 P1E99 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 P1E99 Cadillac - Hybrid/EV Battery Interface Control Module 2 5 V Reference Circuit - AutoCodes.com — P1E99 Cadillac Code - Hybrid/EV Battery Interface Control Module 2 5 V Reference Circuit

What does this mean?

What are the Possible Causes of the DTC P1E99 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 P1E99 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 P1E99 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 P1E99 Cadillac Code

1. What are common symptoms of OBDII code P1E99 in a Cadillac Hybrid/EV vehicle?

- Common symptoms include poor fuel economy, reduced power, illuminated check engine light, and potential drivability issues.

2. What does the OBDII code P1E99 in a Cadillac Hybrid/EV indicate?

- This code specifically points to a problem with the Hybrid/EV Battery Interface Control Module 2 5 V Reference Circuit.

3. What are some possible causes of OBDII code P1E99 in a Cadillac Hybrid/EV?

- Possible causes may include a faulty Hybrid/EV Battery Interface Control Module, damaged wiring, loose connections, or issues with the 5 V reference circuit.

4. How can I diagnose the OBDII code P1E99 in my Cadillac Hybrid/EV?

- Diagnosis typically involves using a scan tool to retrieve the code, checking the Hybrid/EV Battery Interface Control Module for faults, inspecting wiring for damage, and testing the 5 V reference circuit.

5. Is it safe to continue driving with the OBDII code P1E99 in a Cadillac Hybrid/EV?

- It is not recommended to continue driving with this code present, as it can lead to further damage to the Hybrid/EV system and potentially affect vehicle performance.

6. Can I repair OBDII code P1E99 in my Cadillac Hybrid/EV myself?

- Repairing this code may require advanced automotive knowledge and specialized tools, so it is recommended to consult a professional mechanic or dealership for proper diagnosis and repair.

7. How much does it typically cost to fix OBDII code P1E99 in a Cadillac Hybrid/EV?

- Repair costs can vary depending on the underlying issue causing the code, but it is advisable to budget for diagnostic fees, parts replacement costs, and labor charges.

8. Are there any preventive measures to avoid OBDII code P1E99 in a Cadillac Hybrid/EV?

- Regular maintenance, such as checking the health of the Hybrid/EV system components, inspecting wiring for wear, and addressing any warning lights promptly, can help prevent issues leading to this code.

9. Can a faulty Hybrid/EV Battery Interface Control Module cause other OBDII codes to appear in a Cadillac Hybrid/EV?

- Yes, a faulty module can potentially trigger other related codes, so it is essential to address any issues promptly to avoid further complications.

10. How long does it typically take to repair OBDII code P1E99 in a Cadillac Hybrid/EV?

- The repair time can vary depending on the extent of the issue and availability of parts, but it is advisable to consult with a professional technician for an accurate estimate.