AutoCodes – GMC – P1E66 GMC

P1E66 GMC Code - Hybrid/Electric Vehicle Battery 59 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: P1E66 GMC indicates Hybrid/Electric Vehicle Battery 59 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 775

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 P1E66 GMC 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 P1E66 GMC - Hybrid/Electric Vehicle Battery 59 Circuit - AutoCodes.com — P1E66 GMC Code - Hybrid/Electric Vehicle Battery 59 Circuit

What does this mean?

What are the Possible Causes of the DTC P1E66 GMC?

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

How to Fix the DTC P1E66 GMC?

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 P1E66 GMC 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 P1E66 GMC Code

1. What are the common symptoms of OBDII code P1E66 in a GMC Hybrid/Electric Vehicle Battery 59 Circuit?

- Common symptoms include poor fuel economy, decreased power, and potential drivability issues.

2. What are the possible causes of OBDII code P1E66 in a GMC Hybrid/Electric Vehicle Battery 59 Circuit?

- Possible causes may include a faulty battery cell, high voltage system malfunction, or issues with the battery management system.

3. How can I diagnose the OBDII code P1E66 in my GMC hybrid/electric vehicle?

- Proper diagnosis requires a specialized scan tool that can communicate with the hybrid/electric vehicle system to pinpoint the exact cause of the code.

4. Can I continue driving my GMC with the OBDII code P1E66 present?

- It is not recommended to drive the vehicle with this code present, as it can lead to further damage to the hybrid/electric system.

5. What are some repair tips for addressing OBDII code P1E66 in a GMC Hybrid/Electric Vehicle Battery 59 Circuit?

- Repair tips may include checking the battery connections, inspecting the high voltage cables, and consulting a professional technician for a thorough diagnosis.

6. Is it safe to attempt DIY repairs for OBDII code P1E66 in a GMC hybrid/electric vehicle?

- Due to the complex nature of hybrid/electric vehicle systems, it is recommended to seek professional help for repairs related to this code.

7. How much does it typically cost to repair OBDII code P1E66 in a GMC Hybrid/Electric Vehicle Battery 59 Circuit?

- The cost of repair can vary depending on the exact cause of the code, but it may involve replacing components in the hybrid/electric system, which can be expensive.

8. Are there any preventative maintenance steps to avoid OBDII code P1E66 in a GMC hybrid/electric vehicle?

- Regularly scheduled maintenance, such as checking the battery health and monitoring system performance, can help prevent issues that may trigger this code.

9. Can resetting the OBDII code P1E66 in a GMC hybrid/electric vehicle make it go away permanently?

- Resetting the code without addressing the underlying issue will not make it go away permanently. It is crucial to diagnose and repair the root cause of the problem.

10. Will ignoring OBDII code P1E66 in a GMC hybrid/electric vehicle lead to more severe consequences?

- Ignoring this code can potentially lead to further damage to the hybrid/electric system, affecting the vehicle's performance and safety. It is best to address the issue promptly.