AutoCodes – Generic – P1E85

P1E85 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 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 930

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

What does this mean?

What are the Possible Causes of the DTC P1E85?

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

How to Fix the DTC P1E85?

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 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.

Need more information about the P1E85 code?

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Need Help with the Code?

Get the P1E85 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1E85 Buick — Hybrid/Electric Vehicle Battery 90 Circuit
P1E85 Cadillac — Hybrid/Electric Vehicle Battery 90 Circuit
P1E85 Chevrolet — Hybrid/Electric Vehicle Battery 90 Circuit
P1E85 GMC — Hybrid/Electric Vehicle Battery 90 Circuit
P1E85 Saturn — Hybrid/Electric Vehicle Battery 90 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 P1E85 Code

1. What are the common symptoms of OBDII code P1E85 (Hybrid/Electric Vehicle Battery 90 Circuit)?

Common symptoms include decreased hybrid system performance, reduced fuel efficiency, and potential difficulty starting the vehicle.

2. What usually causes the OBDII code P1E85 to trigger?

This code is typically triggered by issues related to the hybrid/electric vehicle battery 90 circuit, such as wiring faults, loose connections, or a malfunctioning battery pack.

3. How can I diagnose the underlying cause of OBDII code P1E85?

Diagnosing the issue may require using a diagnostic scan tool to retrieve specific fault codes, conducting visual inspections of the battery connections, and performing voltage tests on the battery and related components.

4. Are there any safety precautions to keep in mind when working on the hybrid/electric vehicle battery circuit?

Yes, always follow manufacturer guidelines for working on high-voltage systems, wear appropriate personal protective equipment, and consider consulting a professional if you are not experienced with hybrid vehicle systems.

5. Can I continue driving my vehicle with OBDII code P1E85 present?

It is not recommended to continue driving the vehicle with this code active, as it can lead to further damage to the hybrid system and potentially pose a safety risk.

6. How can I reset the OBDII code P1E85 after making repairs?

After addressing the underlying issue causing the code, you can reset it using a diagnostic scan tool or by disconnecting the vehicle's battery for a few minutes to clear the fault code.

7. Is it possible to repair OBDII code P1E85 on my own, or should I seek professional help?

While some basic inspections and repairs can be done by DIY enthusiasts, complex issues with the hybrid system should be addressed by a qualified technician with experience in hybrid/electric vehicle maintenance.

8. Can a faulty 12-volt battery cause OBDII code P1E85 to appear?

Yes, a weak or faulty 12-volt battery can sometimes trigger this code due to its impact on the overall hybrid system performance and voltage stability.

9. Are there any preventive maintenance tips to avoid encountering OBDII code P1E85 in the future?

Regularly inspecting the hybrid/electric vehicle battery connections, keeping the battery pack well-maintained, and following the manufacturer's recommended service schedule can help prevent issues leading to this fault code.

10. How serious is OBDII code P1E85, and how urgent is it to address the problem?

This code indicates a problem with the hybrid/electric vehicle battery circuit, which is a critical component of the vehicle's operation. It is important to address the issue promptly to avoid further damage and ensure the safety and performance of the vehicle.