AutoCodes – Generic – P1E99

P1E99 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 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 1,032

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

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?

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 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

P1E99 Buick — Hybrid/EV Battery Interface Control Module 2 5 V Reference Circuit
P1E99 Cadillac — Hybrid/EV Battery Interface Control Module 2 5 V Reference Circuit
P1E99 Chevrolet — Hybrid/EV Battery Interface Control Module 2 5 V Reference Circuit
P1E99 GMC — Hybrid/EV Battery Interface Control Module 2 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 P1E99 Code

What does the OBDII code P1E99 mean?

The OBDII code P1E99 indicates an issue with the Hybrid/EV Battery Interface Control Module 2 5 V Reference Circuit, often related to a malfunction in the battery management system.

What symptoms might I experience with the P1E99 code?

Common symptoms include warning lights on the dashboard, reduced vehicle performance, limited electric driving range, and potential issues with charging the battery.

What could cause the P1E99 code to trigger?

The code can be triggered by a faulty Battery Interface Control Module, issues with wiring or connectors, a defective sensor, or problems in the battery pack itself.

How can I diagnose the problem associated with the P1E99 code?

To diagnose the issue, use an OBD-II scanner to confirm the code, inspect the wiring and connectors for damage, test the Battery Interface Control Module, and check the 5 V reference circuit for proper voltage.

What are some common repair tips for fixing the P1E99 code?

Repair tips include checking and repairing any damaged wiring or connectors, replacing a faulty Battery Interface Control Module, and ensuring that all sensors in the circuit are functioning correctly.

Can I drive my vehicle with the P1E99 code?

While it may be possible to drive your vehicle, it is not recommended as it could lead to further damage to the hybrid system or battery management components.

How much does it typically cost to repair a P1E99 code issue?

Repair costs can vary widely depending on the specific problem, but they can range from minor wiring repairs costing less than $100 to replacing a control module, which could cost several hundred dollars or more.

Is the P1E99 code serious?

Yes, the P1E99 code can indicate a serious issue affecting the hybrid or electric vehicle's battery management system, which could lead to reduced performance or safety concerns if not addressed.

Should I reset the code after repairs?

Yes, after completing the necessary repairs, you should clear the code using an OBD-II scanner and then test drive the vehicle to ensure the issue does not reoccur.