AutoCodes – GMC – P0B77 GMC

P0B77 GMC Code - Hybrid/Electric Vehicle Battery 13 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: P0B77 GMC indicates Hybrid/Electric Vehicle Battery 13 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 828

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 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P0B77 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 P0B77 GMC - Hybrid/Electric Vehicle Battery 13 Circuit - AutoCodes.com — P0B77 GMC Code - Hybrid/Electric Vehicle Battery 13 Circuit

What does this mean?

What are the Possible Causes of the DTC P0B77 GMC?

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

How to Fix the DTC P0B77 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 P0B77 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.

Need more information about the P0B77 GMC code?

Need more information on how to fix the P0B77 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0B77 GMC code diagnosed by a professional: Find a repair shop in your area

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 P0B77 GMC Code

1. What does the OBDII code P0B77 for GMC Hybrid/Electric Vehicle Battery 13 Circuit indicate?

The code P0B77 indicates an issue with the Hybrid/Electric Vehicle Battery 13 Circuit in your GMC vehicle.

2. What are common symptoms of the P0B77 code in a GMC vehicle?

Common symptoms of the P0B77 code may include the Hybrid/Electric Vehicle Battery warning light illuminating on the dashboard, decreased fuel efficiency, and potential issues with hybrid/electric system performance.

3. What are possible causes of the P0B77 code in a GMC vehicle?

Possible causes of the P0B77 code include a faulty hybrid/electric battery, damaged wiring or connectors in the Hybrid/Electric Vehicle Battery 13 Circuit, or issues with the battery management system.

4. How can I diagnose the P0B77 code in my GMC vehicle?

Diagnosing the P0B77 code typically involves using a diagnostic scanner to retrieve the specific fault code, inspecting the hybrid/electric battery and related components for damage, and testing the wiring and connectors for continuity.

5. Is it safe to continue driving with the P0B77 code present in my GMC vehicle?

It is not recommended to continue driving with the P0B77 code present, as it can lead to potential issues with the hybrid/electric system and may cause further damage to the vehicle.

6. How can I repair the P0B77 code in my GMC vehicle?

Repairing the P0B77 code may involve replacing the hybrid/electric battery, repairing or replacing damaged wiring and connectors, or resetting the battery management system with the help of a qualified technician.

7. Can I reset the P0B77 code in my GMC vehicle myself?

While you may be able to clear the code temporarily using a diagnostic scanner, it is important to address the underlying issue causing the P0B77 code to prevent it from reoccurring.

8. Are there any maintenance tips to prevent the P0B77 code from appearing in my GMC vehicle?

Regularly inspecting the hybrid/electric battery, keeping the battery terminals clean and secure, and following the manufacturer's maintenance schedule can help prevent issues that may trigger the P0B77 code.

9. How much does it typically cost to repair the P0B77 code in a GMC vehicle?

The cost of repairing the P0B77 code can vary depending on the specific cause of the issue, the extent of the damage, and the labor rates in your area. It is recommended to get a professional diagnosis for an accurate estimate.

10. Can the P0B77 code be related to other OBDII codes in a GMC vehicle?

The P0B77 code is specific to the Hybrid/Electric Vehicle Battery 13 Circuit and may not be directly related to other OBDII codes. It is important to address each code individually to ensure all issues are properly resolved.