AutoCodes – Buick – P1E8A Buick

P1E8A Buick Code - Hybrid/Electric Vehicle Battery 95 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: P1E8A Buick indicates Hybrid/Electric Vehicle Battery 95 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 806

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 P1E8A 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 P1E8A Buick - Hybrid/Electric Vehicle Battery 95 Circuit - AutoCodes.com — P1E8A Buick Code - Hybrid/Electric Vehicle Battery 95 Circuit

What does this mean?

What are the Possible Causes of the DTC P1E8A Buick?

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

How to Fix the DTC P1E8A 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 P1E8A 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 P1E8A Buick Code

1. What does the OBDII code P1E8A mean for a Buick?

Code P1E8A indicates an issue with the Hybrid/Electric Vehicle Battery 95 Circuit, typically related to a fault in the battery control module or its associated circuits.

2. What are the common symptoms of code P1E8A in a Buick?

Symptoms may include the check engine light or hybrid system warning light, reduced hybrid or electric vehicle performance, and possible loss of battery charging functionality.

3. What causes code P1E8A to appear on a Buick?

Common causes include a faulty battery control module, damaged or corroded wiring, a malfunctioning hybrid battery sensor, or internal battery issues.

4. Can I drive my Buick with the P1E8A code active?

It is not recommended to drive with this code active, as it may lead to further damage to the hybrid battery system or cause reduced vehicle performance.

5. How is code P1E8A diagnosed on a Buick?

A technician will typically use a scan tool to check for related codes, inspect the battery control module connections and wiring, and perform voltage and resistance tests on the affected circuit.

6. What repairs are needed to fix code P1E8A in a Buick?

Repairs may include replacing a faulty battery control module, repairing or replacing damaged wiring or connectors, or addressing internal battery issues if necessary.

7. How much does it cost to fix the P1E8A code on a Buick?

The repair cost can vary widely, ranging from $200 to $2,000 or more, depending on whether the issue is with wiring, the control module, or the hybrid battery itself.

8. Can a dead 12-volt battery cause the P1E8A code in a Buick?

While unlikely, a weak or dead 12-volt battery can sometimes cause communication issues that trigger hybrid-related codes. Testing the 12-volt system is a good starting point.

9. Does the P1E8A code mean the hybrid battery needs replacement?

Not necessarily. The code may point to a circuit or control module issue rather than a complete failure of the hybrid battery.

10. Is the P1E8A code covered under warranty for a Buick hybrid vehicle?

It may be covered under the hybrid system or battery warranty, depending on the vehicle's age and mileage. Check with your dealership for warranty specifics.