AutoCodes – Chevrolet – P0B77 Chevrolet

P0B77 Chevrolet 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 Chevrolet 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.

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Code Popularity 1,291

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

What does this mean?

What are the Possible Causes of the DTC P0B77 Chevrolet?

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

How to Fix the DTC P0B77 Chevrolet?

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 Chevrolet 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 P0B77 Chevrolet Code

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

The P0B77 code specifically relates to a problem with the 13th circuit within the hybrid/electric vehicle battery system.

2. What are the common symptoms associated with OBDII code P0B77 in a Chevrolet hybrid/electric vehicle?

Common symptoms of code P0B77 may include issues with the vehicle's hybrid/electric system performance, reduced fuel efficiency, and potential warning lights on the dashboard.

3. What are the possible causes of OBDII code P0B77 in a Chevrolet hybrid/electric vehicle?

Causes of code P0B77 can include faulty wiring, poor connections, damaged components within the battery system, or issues with the battery control module.

4. How can I diagnose the OBDII code P0B77 in my Chevrolet hybrid/electric vehicle?

Diagnosing code P0B77 typically involves using a diagnostic scanner to retrieve the code, conducting visual inspections of the battery system components, and testing the wiring and connections for continuity.

5. Can I still drive my Chevrolet hybrid/electric vehicle with OBDII code P0B77 present?

It is not recommended to drive your vehicle with code P0B77 present, as it can potentially lead to further damage to the hybrid/electric system.

6. How can I repair OBDII code P0B77 in my Chevrolet hybrid/electric vehicle?

Repairing code P0B77 may involve repairing or replacing damaged wiring, connectors, or components within the 13th circuit of the hybrid/electric vehicle battery system.

7. Are there any DIY tips for troubleshooting OBDII code P0B77 in a Chevrolet hybrid/electric vehicle?

DIY tips for troubleshooting code P0B77 include checking for loose connections, inspecting the battery system for visible damage, and ensuring proper grounding of components.

8. How serious is OBDII code P0B77 in a Chevrolet hybrid/electric vehicle?

Code P0B77 should be addressed promptly to prevent potential damage to the hybrid/electric system and ensure the vehicle operates safely and efficiently.

9. What is the typical cost to repair OBDII code P0B77 in a Chevrolet hybrid/electric vehicle?

The cost to repair code P0B77 can vary depending on the extent of the issue, but it may involve expenses for parts replacement, labor, and diagnostic services.

10. Can I reset OBDII code P0B77 in my Chevrolet hybrid/electric vehicle without fixing the underlying issue?

While you can reset the code, it is not recommended to do so without addressing the underlying problem, as it may result in the issue recurring and potentially causing further damage.