AutoCodes – Chevrolet – P1E85 Chevrolet

P1E85 Chevrolet 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 Chevrolet 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 1,069

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 Chevrolet 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 Chevrolet - Hybrid/Electric Vehicle Battery 90 Circuit - AutoCodes.com — P1E85 Chevrolet Code - Hybrid/Electric Vehicle Battery 90 Circuit

What does this mean?

What are the Possible Causes of the DTC P1E85 Chevrolet?

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

How to Fix the DTC P1E85 Chevrolet?

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 Chevrolet 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 Chevrolet Code

What does the OBDII code P1E85 mean on a Chevrolet?

The code P1E85 indicates an issue with the Hybrid/Electric Vehicle Battery 90 Circuit, often related to voltage irregularities or communication faults in the high-voltage battery system.

What are common symptoms of the P1E85 code in a Chevrolet?

Typical symptoms include the check engine light or service hybrid system warning, reduced fuel efficiency, limited electric drive capability, or a failure to start.

What causes the P1E85 code to trigger?

The code can be caused by faulty battery control module wiring, a malfunctioning hybrid battery pack, corroded electrical connections, or software-related issues.

Can I drive my Chevrolet with a P1E85 code?

Driving with this code is not recommended, as it may lead to further damage to the hybrid system or leave the vehicle inoperable.

How is the P1E85 code diagnosed in a Chevrolet?

A technician will inspect the hybrid battery system, check for damaged wiring or connectors, and use a scan tool to monitor battery module data and voltage readings.

What repairs fix the P1E85 code on a Chevrolet?

Common repairs include replacing damaged wiring, repairing corroded connectors, reprogramming the hybrid control module, or replacing the hybrid battery if necessary.

Is the P1E85 code unique to Chevrolet hybrid vehicles?

While P1E85 is more commonly associated with Chevrolet hybrids, other manufacturers may use similar codes for their hybrid or electric vehicle systems.

How much does it cost to fix the P1E85 code?

Repair costs vary widely depending on the root cause, ranging from $100 for wiring repairs to $4,000 or more for hybrid battery replacement.

Can a dead 12V battery cause the P1E85 code?

A weak or dead 12V battery can sometimes trigger hybrid system faults, but the P1E85 code specifically relates to the high-voltage battery system.

Do I need to update the software to clear the P1E85 code?

In some cases, a software update for the hybrid control module may be required to resolve the issue, especially if the problem is related to programming errors.