AutoCodes – Buick – P0B78 Buick

P0B78 Buick 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 Buick 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 942

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

What does this mean?

What are the Possible Causes of the DTC P0B78 Buick?

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

How to Fix the DTC P0B78 Buick?

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 Buick 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 Buick Code

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

- The common symptoms include reduced hybrid/electric vehicle performance, decreased fuel efficiency, and potential issues with the battery system.

2. What are the possible causes of OBDII code P0B78 in a Buick hybrid/electric vehicle?

- The code P0B78 can be triggered by issues with the high voltage battery 13 circuit, such as wiring faults, loose connections, or a malfunctioning battery control module.

3. How can I diagnose the OBDII code P0B78 in my Buick hybrid/electric vehicle?

- Diagnosing the code P0B78 typically involves performing a thorough inspection of the high voltage battery system, checking for damaged wiring, loose connections, or faulty components using a diagnostic scanner.

4. Can I continue driving my Buick hybrid/electric vehicle with the OBDII code P0B78 present?

- It is not recommended to continue driving your vehicle with the code P0B78 present, as it can lead to further damage to the high voltage battery system and affect the overall performance of the vehicle.

5. What are some repair tips for fixing OBDII code P0B78 in a Buick hybrid/electric vehicle?

- Repairing the code P0B78 may involve repairing or replacing damaged wiring, tightening loose connections, or recalibrating the battery control module to ensure proper functioning of the high voltage battery system.

6. How much does it typically cost to repair OBDII code P0B78 in a Buick hybrid/electric vehicle?

- The cost of repairing the code P0B78 can vary depending on the extent of the issue and the specific components that need to be replaced. It is recommended to consult a professional mechanic for an accurate estimate.

7. Can I reset the OBDII code P0B78 in my Buick hybrid/electric vehicle using a scan tool?

- Yes, you can reset the code P0B78 using a scan tool, but it is important to first diagnose and address the underlying issue causing the code to prevent it from reoccurring.

8. Is the OBDII code P0B78 specific to Buick hybrid/electric vehicles only?

- The OBDII code P0B78 specifically relates to hybrid/electric vehicle battery 13 circuit performance and may be present in other hybrid/electric vehicles as well, not just limited to Buick models.

9. Can extreme weather conditions impact the triggering of OBDII code P0B78 in a Buick hybrid/electric vehicle?

- Yes, extreme weather conditions such as extreme heat or cold can potentially affect the performance of the high voltage battery system and contribute to the triggering of the code P0B78.

10. How often should I have the high voltage battery system inspected to prevent OBDII code P0B78 in my Buick hybrid/electric vehicle?

- It is recommended to have the high voltage battery system inspected regularly as part of routine maintenance to detect any potential issues early on and prevent the occurrence of the code P0B78.