AutoCodes – GMC – P1E85 GMC

P1E85 GMC Code - Hybrid/Electric Vehicle Battery 90 Circuit

Quick Answer

The Hybrid/Electric Vehicle battery pack contains 288 cells. Common causes include Faulty Hybrid/Electric Vehicle Battery Pack, Faulty Hybrid/Electric Vehicle Battery Interface Control Module. 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: P1E85 GMC indicates Hybrid/Electric Vehicle Battery 90 Circuit.
Common causes: Common causes include Faulty Hybrid/Electric Vehicle Battery Pack, Faulty Hybrid/Electric Vehicle Battery Interface Control Module.
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 797

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 P1E85 GMC Description

The Hybrid/Electric Vehicle battery pack contains 288 cells. Groups of three cells are welded together in parallel. There are a total of 96 cell groups in the hybrid/EV battery pack assembly. These cell groups are electrically connected in-series. Each individual cell group is rated at 3.7 V, for a nominal system voltage of 355 V 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 battery cell groups through the four hybrid/EV battery interface control modules. Voltage sense circuits are attached to each individual cell group, and these sense circuits terminate at a connector located on the top surface of the battery section. A serviceable auxiliary battery wiring harness joins this connector to a hybrid/EV battery interface control module, also located on the top surface of the battery section. The hybrid/EV battery interface control module encodes the voltage reading and transmits it to the battery energy control module through the battery control harness. There is one hybrid/EV battery interface control module located on battery sections one and two, and two hybrid/EV battery interface control modules associated with battery section three. The hybrid/EV battery interface control module, battery energy control module wiring harness, auxiliary battery wiring 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 P1E85 GMC - Hybrid/Electric Vehicle Battery 90 Circuit - AutoCodes.com — P1E85 GMC Code - Hybrid/Electric Vehicle Battery 90 Circuit

What does this mean?

What are the Possible Causes of the DTC P1E85 GMC?

Faulty Hybrid/Electric Vehicle Battery Pack
Faulty Hybrid/Electric Vehicle Battery Interface Control Module

How to Fix the DTC P1E85 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 P1E85 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 P1E85 GMC Code

1. What does the OBDII code P1E85 mean on a GMC vehicle?

The code P1E85 indicates an issue with the Hybrid/Electric Vehicle Battery 90 Circuit, often linked to communication or performance problems in the battery management system.

2. What are the common symptoms of the P1E85 code?

Symptoms may include reduced fuel efficiency, limited hybrid or electric functionality, warning lights on the dashboard, and possible loss of power or performance.

3. What causes the P1E85 code to appear?

This code can be triggered by a faulty battery sensor, damaged wiring or connectors, a malfunctioning battery control module, or issues with the high-voltage battery.

4. Can the P1E85 code damage my GMC hybrid or electric vehicle?

While the code itself doesnâ€™t directly cause damage, ignoring it can lead to further issues with battery performance and potentially expensive repairs over time.

5. How is the P1E85 code diagnosed?

A technician will use a scan tool to check for related codes, inspect the battery and its connections, and test the circuit for continuity or short circuits.

6. Can I drive my GMC with the P1E85 code?

Itâ€™s possible to drive the vehicle, but reduced performance or safety concerns may arise. Itâ€™s best to have the issue diagnosed and repaired promptly.

7. How do you fix the P1E85 code?

Repairs may include replacing a damaged battery sensor, repairing or replacing wiring or connectors, or reprogramming or replacing the battery control module.

8. How much does it cost to fix the P1E85 code on a GMC vehicle?

Repair costs can vary widely, ranging from $100 for minor wiring repairs to over $1,000 if the battery control module requires replacement.

9. Can a weak 12V battery cause the P1E85 code?

A weak or failing 12V battery can sometimes contribute to hybrid or electric system issues, so itâ€™s worth checking and replacing the 12V battery if needed.

10. Is the P1E85 code a common problem in GMC hybrid or electric vehicles?

While not extremely common, it can occur in GMC hybrid or electric models due to wear and tear or faults in the battery management system. Regular maintenance can help prevent this issue.