AutoCodes – GMC – P1E99 GMC

P1E99 GMC 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 GMC 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 824

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

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 GMC?

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 GMC 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 GMC Code

1. What does the OBDII code P1E99 mean on a GMC vehicle?

The P1E99 code indicates an issue with the Hybrid/EV Battery Interface Control Module 2's 5V reference circuit, which is essential for proper battery management.

2. What are the common symptoms of the P1E99 code?

Symptoms may include the check engine light turning on, reduced power mode, poor fuel efficiency, and limited or no electric drive functionality.

3. What causes the P1E99 code to trigger?

This code is typically caused by a faulty 5V reference circuit, wiring issues, a malfunctioning Hybrid/EV Battery Interface Control Module 2, or a short circuit in the system.

4. Can a weak or failing hybrid/EV battery trigger the P1E99 code?

While a weak battery itself may not directly trigger the code, issues in the battery system can lead to faults in the 5V reference circuit, causing the code to appear.

5. How can I diagnose the P1E99 code on my GMC?

Diagnosis involves checking the 5V reference circuit for shorts, testing all related wiring and connectors, and using a scan tool to monitor the Hybrid/EV Battery Interface Control Module 2.

6. Is it safe to drive with the P1E99 code on a GMC hybrid or EV?

Itâ€™s not recommended because the vehicle may enter reduced power mode, which can limit performance and potentially cause further damage.

7. What repairs are needed to fix the P1E99 code?

Repairs might include fixing or replacing damaged wiring, repairing the 5V reference circuit, or replacing the Hybrid/EV Battery Interface Control Module 2 if faulty.

8. Can I clear the P1E99 code without fixing the issue?

Clearing the code without addressing the root cause may only result in the code returning and could lead to further complications.

9. How much does it cost to repair a P1E99 code on a GMC?

Repair costs vary depending on the issue, but diagnosing and replacing the Hybrid/EV Battery Interface Control Module 2 can cost several hundred dollars.

10. Can a software update fix the P1E99 code?

In some cases, a software update for the Hybrid/EV Battery Interface Control Module may resolve the issue, but this depends on the specific problem and vehicle model.