AutoCodes – Chevrolet – P0B78 Chevrolet

P0B78 Chevrolet Code - Hybrid/Electric Vehicle Battery 13 Circuit Performance

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: P0B78 Chevrolet indicates Hybrid/Electric Vehicle Battery 13 Circuit Performance.
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 1,151

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 P0B78 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 P0B78 Chevrolet - Hybrid/Electric Vehicle Battery 13 Circuit Performance - AutoCodes.com — P0B78 Chevrolet Code - Hybrid/Electric Vehicle Battery 13 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P0B78 Chevrolet?

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

How to Fix the DTC P0B78 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 P0B78 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 P0B78 Chevrolet Code

1. What does OBDII code P0B78 for a Chevrolet Hybrid/Electric Vehicle Battery 13 Circuit Performance indicate?

This code indicates that there is a performance issue detected in the 13th circuit of the hybrid/electric vehicle battery.

2. What are the common symptoms of OBDII code P0B78 in a Chevrolet hybrid vehicle?

Common symptoms include decreased fuel efficiency, reduced power output, and potential issues with the vehicle's hybrid system.

3. What are some possible causes of OBDII code P0B78 in a Chevrolet hybrid vehicle?

Possible causes include a faulty battery pack, damaged wiring in the 13th circuit, a malfunctioning battery management system, or issues with the hybrid system control module.

4. How can I diagnose the OBDII code P0B78 in my Chevrolet hybrid vehicle?

Diagnosis typically involves using a scan tool to read the code, inspecting the battery pack and wiring in the 13th circuit, and performing tests on the hybrid system components.

5. Can I still drive my Chevrolet hybrid vehicle with OBDII code P0B78 present?

It is not recommended to drive the vehicle with this code present, as it can lead to further damage to the hybrid system and potentially unsafe driving conditions.

6. How can I repair OBDII code P0B78 in my Chevrolet hybrid vehicle?

Repair options may include replacing the battery pack, repairing or replacing damaged wiring, resetting the battery management system, or reprogramming the hybrid system control module.

7. Is it possible to clear OBDII code P0B78 in a Chevrolet hybrid vehicle without fixing the underlying issue?

Clearing the code without addressing the root cause may temporarily reset the warning light, but the issue will likely resurface until the problem is properly resolved.

8. Are there any safety concerns associated with OBDII code P0B78 in a Chevrolet hybrid vehicle?

Yes, safety concerns may arise due to potential power loss or malfunction of the hybrid system components, which could impact the vehicle's performance and handling.

9. How much does it typically cost to repair OBDII code P0B78 in a Chevrolet hybrid vehicle?

The cost of repairs can vary depending on the specific issue causing the code, but it is advisable to consult a qualified mechanic or dealership for an accurate estimate.

10. Can regular maintenance help prevent OBDII code P0B78 from occurring in my Chevrolet hybrid vehicle?

Regular maintenance, including inspections of the battery pack and hybrid system components, can help identify potential issues early and prevent the occurrence of OBDII code P0B78.