AutoCodes – GMC – P1E77 GMC

P1E77 GMC Code - Hybrid/Electric Vehicle Battery 76 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: P1E77 GMC indicates Hybrid/Electric Vehicle Battery 76 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 833

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 P1E77 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 P1E77 GMC - Hybrid/Electric Vehicle Battery 76 Circuit - AutoCodes.com — P1E77 GMC Code - Hybrid/Electric Vehicle Battery 76 Circuit

What does this mean?

What are the Possible Causes of the DTC P1E77 GMC?

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

How to Fix the DTC P1E77 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 P1E77 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 P1E77 GMC Code

1. What are the common symptoms of OBDII code P1E77 GMC related to the Hybrid/Electric Vehicle Battery 76 Circuit?

- Common symptoms may include a decrease in hybrid/electric vehicle performance, reduced fuel efficiency, and potential issues with battery charging.

2. What are the possible causes of OBDII code P1E77 GMC indicating an issue with the Hybrid/Electric Vehicle Battery 76 Circuit?

- Possible causes may include a faulty battery pack, damaged wiring or connections in the battery circuit, or issues with the battery control module.

3. How can I diagnose the Hybrid/Electric Vehicle Battery 76 Circuit issue related to OBDII code P1E77 GMC?

- Diagnosing the issue may involve conducting a thorough inspection of the battery pack, checking the wiring for any damage, and using a diagnostic scanner to analyze the battery control module data.

4. Can I continue driving my hybrid/electric vehicle with OBDII code P1E77 GMC present?

- It is not recommended to continue driving with this code active as it can lead to further damage to the hybrid/electric vehicle's battery system and affect overall vehicle performance.

5. What are some repair tips for addressing OBDII code P1E77 GMC related to the Hybrid/Electric Vehicle Battery 76 Circuit?

- Repair tips may include replacing the faulty battery pack, repairing any damaged wiring, ensuring proper connections in the battery circuit, and resetting the battery control module.

6. Is it possible to reset OBDII code P1E77 GMC without addressing the underlying issue with the Hybrid/Electric Vehicle Battery 76 Circuit?

- While you can reset the code, it is crucial to address the root cause of the issue to prevent further damage and ensure the proper functioning of the hybrid/electric vehicle.

7. How much does it typically cost to repair OBDII code P1E77 GMC related to the Hybrid/Electric Vehicle Battery 76 Circuit?

- The cost of repair can vary depending on the specific issue, but it may involve expenses for parts replacement, labor, and diagnostic tests. It is advisable to consult a professional technician for an accurate estimate.

8. Are there any preventive maintenance measures to avoid encountering OBDII code P1E77 GMC in hybrid/electric vehicles?

- Regularly inspecting the battery system, ensuring proper charging habits, and following manufacturer's maintenance recommendations can help prevent issues leading to this OBDII code.