AutoCodes – Buick – P1E6D Buick

P1E6D Buick Code - Hybrid/Electric Vehicle Battery 66 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: P1E6D Buick indicates Hybrid/Electric Vehicle Battery 66 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 761

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 Mar 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1E6D 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 P1E6D Buick - Hybrid/Electric Vehicle Battery 66 Circuit - AutoCodes.com — P1E6D Buick Code - Hybrid/Electric Vehicle Battery 66 Circuit

What does this mean?

What are the Possible Causes of the DTC P1E6D Buick?

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

How to Fix the DTC P1E6D 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 P1E6D 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 P1E6D Buick Code

1. What does the OBDII code P1E6D mean on a Buick?

P1E6D indicates an issue with the Hybrid/Electric Vehicle Battery 66 Circuit, often relating to a voltage or communication fault in the battery system.

2. What are the common symptoms of the P1E6D code in a Buick?

Symptoms may include reduced hybrid or electric performance, a check engine light, limited driving range, or the vehicle entering limp mode.

3. What causes the P1E6D code to appear?

The code can be triggered by faulty battery wiring, a defective battery module, a malfunctioning battery control module, or corrosion at electrical connections.

4. Can I drive my Buick with the P1E6D code?

Itâ€™s not recommended, as the code may indicate a serious issue with the hybrid or electric battery system, potentially causing further damage or reduced safety.

5. How is the P1E6D code diagnosed?

Technicians use a diagnostic scanner to read the code, inspect the battery system for wiring issues, and test the battery control module for proper operation.

6. What repairs are needed to fix the P1E6D code?

Repairs may include replacing damaged wiring, cleaning corroded connections, reprogramming or replacing the battery control module, or replacing faulty battery modules.

7. How much does it cost to fix the P1E6D code on a Buick?

Repair costs can vary widely, ranging from $200 for wiring repairs to over $1,000 if battery modules or control units need replacement.

8. Can a weak 12-volt battery cause the P1E6D code?

A weak 12-volt battery is unlikely to directly trigger this code, but it can cause communication issues that may lead to hybrid system faults.

9. Does resetting the check engine light fix the P1E6D code?

Resetting the light may clear the code temporarily, but the underlying issue needs to be diagnosed and repaired to prevent it from returning.

10. Is the P1E6D code covered under warranty for my Buick?

If your vehicle is still under the hybrid or electric system warranty, the repairs for this code may be covered. Check with your dealership for details.