AutoCodes – Buick – P1E89 Buick

P1E89 Buick Code - Hybrid/Electric Vehicle Battery 94 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: P1E89 Buick indicates Hybrid/Electric Vehicle Battery 94 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 801

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 P1E89 Buick 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 P1E89 Buick - Hybrid/Electric Vehicle Battery 94 Circuit - AutoCodes.com — P1E89 Buick Code - Hybrid/Electric Vehicle Battery 94 Circuit

What does this mean?

What are the Possible Causes of the DTC P1E89 Buick?

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

How to Fix the DTC P1E89 Buick?

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 P1E89 Buick 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 P1E89 Buick Code

1. What does the OBDII code P1E89 mean on a Buick?

P1E89 indicates an issue with the Hybrid/Electric Vehicle Battery 94 Circuit, often related to a sensor or communication fault in the hybrid battery system.

2. What are the common symptoms of code P1E89 on a Buick?

Symptoms may include the check engine light turning on, reduced hybrid system performance, limited driving range, or the vehicle entering "limp mode."

3. What causes the P1E89 code to appear on a Buick?

The code can be caused by faulty wiring, a malfunctioning battery sensor, a defective hybrid battery module, or issues with the battery control module.

4. Can I drive my Buick with the P1E89 code active?

While the vehicle may still be drivable, it is not recommended as reduced performance and potential further damage to the hybrid battery system could occur.

5. How do you diagnose the P1E89 code on a Buick?

Diagnosis involves using an advanced scan tool to read hybrid system data, inspecting battery wiring and connectors, and testing the hybrid battery module and sensors.

6. How is the P1E89 code typically fixed on a Buick?

The fix may involve repairing or replacing damaged wiring, replacing a faulty hybrid battery sensor, or reprogramming or replacing the battery control module.

7. What tools are needed to troubleshoot the P1E89 code?

Youâ€™ll need a professional-grade OBDII scanner capable of reading hybrid system codes, a multimeter for testing circuits, and potentially the vehicleâ€™s service manual.

8. How much does it cost to repair the P1E89 code on a Buick?

Repair costs vary depending on the issue but can range from $100 for wiring repairs to over $1,000 for hybrid battery module replacement.

9. Can a dead 12V battery cause the P1E89 code on a Buick?

Yes, a weak or failing 12V battery can cause communication issues in the hybrid system and trigger the P1E89 code.

10. Do I need to take my Buick to a dealer to fix the P1E89 code?

While a dealer or hybrid specialist is recommended for accurate diagnosis and repair, a skilled independent mechanic with hybrid system experience may also address the issue.