AutoCodes – GMC – P0B78 GMC

P0B78 GMC 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 GMC 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 768

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

What does this mean?

What are the Possible Causes of the DTC P0B78 GMC?

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

How to Fix the DTC P0B78 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 P0B78 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 P0B78 GMC Code

1. What are common symptoms of OBDII code P0B78 in a GMC hybrid/electric vehicle?

- Common symptoms include reduced hybrid system performance, reduced fuel efficiency, and potential illumination of the check engine light.

2. What does the OBDII code P0B78 GMC indicate about the hybrid/electric vehicle battery 13 circuit performance?

- This code indicates a problem with the performance of the 13th circuit in the hybrid/electric vehicle battery system.

3. What are possible causes of the P0B78 code in a GMC hybrid/electric vehicle?

- Possible causes include a faulty battery cell, issues with battery cooling, wiring or connector problems, or a malfunctioning battery management system.

4. How can I diagnose the P0B78 code in my GMC hybrid/electric vehicle?

- Diagnosis typically involves using a scan tool to read the code, inspecting the battery system components, and performing tests to identify the specific issue within the 13th circuit.

5. Is it safe to continue driving my GMC hybrid/electric vehicle with the P0B78 code present?

- It is not recommended to continue driving the vehicle with this code as it can lead to further damage to the hybrid system and potentially cause safety issues.

6. Can I repair the P0B78 code in my GMC hybrid/electric vehicle myself?

- While some basic troubleshooting steps can be taken, repairing this code often requires specialized knowledge and equipment, so it is best to consult a professional mechanic or dealership.

7. How much does it typically cost to repair the P0B78 code in a GMC hybrid/electric vehicle?

- The cost of repair can vary depending on the specific issue causing the code, but it may involve replacing a battery cell, repairing wiring, or recalibrating the battery management system.

8. Are there any preventive maintenance tips to avoid the P0B78 code in a GMC hybrid/electric vehicle?

- Regularly scheduled maintenance, such as battery inspections and system checks, can help prevent issues that may trigger the P0B78 code.

9. Can the P0B78 code be intermittent or recurring in a GMC hybrid/electric vehicle?

- Yes, the code may appear intermittently or recur if the underlying issue is not fully resolved, making it important to address the root cause of the problem.

10. How long does it typically take to repair the P0B78 code in a GMC hybrid/electric vehicle?

- The repair time can vary depending on the complexity of the issue, availability of parts, and the expertise of the technician, but it may range from a few hours to a day or more.