AutoCodes – Cadillac – P0B78 Cadillac

P0B78 Cadillac 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 Cadillac 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 906

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

What does this mean?

What are the Possible Causes of the DTC P0B78 Cadillac?

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

How to Fix the DTC P0B78 Cadillac?

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 Cadillac 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 Cadillac Code

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

The common symptoms of OBDII code P0B78 include decreased fuel efficiency, reduced power output, and potential issues with the vehicle's hybrid/electric system.

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

Possible causes of OBDII code P0B78 include a faulty hybrid/electric vehicle battery, damaged wiring or connectors in the battery 13 circuit, or issues with the battery control module.

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

Diagnosing OBDII code P0B78 typically involves using a scan tool to retrieve the specific fault codes, inspecting the hybrid/electric vehicle battery and related components for any visible damage, and testing the battery 13 circuit for continuity and proper voltage.

4. Can I continue driving my Cadillac with the OBDII code P0B78 present?

It is not recommended to continue driving your Cadillac with the OBDII code P0B78 present, as it can lead to further damage to the hybrid/electric system and potentially unsafe driving conditions.

5. How do I repair OBDII code P0B78 in my Cadillac hybrid/electric vehicle?

Repairing OBDII code P0B78 may involve replacing the hybrid/electric vehicle battery, repairing or replacing damaged wiring or connectors in the battery 13 circuit, or reprogramming the battery control module.

6. Is it safe to attempt repairs for OBDII code P0B78 on my own?

Due to the complexity of the hybrid/electric system and high-voltage components involved, it is recommended to seek professional assistance or take your Cadillac to a certified technician for repairs related to OBDII code P0B78.

7. Can a low or depleted hybrid/electric vehicle battery cause the OBDII code P0B78?

Yes, a low or depleted hybrid/electric vehicle battery can cause the OBDII code P0B78 due to insufficient power delivery and performance issues in the battery 13 circuit.

8. How often should I have the hybrid/electric vehicle battery inspected to prevent OBDII code P0B78?

It is recommended to have the hybrid/electric vehicle battery inspected regularly as part of routine maintenance to prevent issues like OBDII code P0B78. Check your vehicle's manual for specific maintenance intervals.

9. Are there any specific driving habits that can help prevent OBDII code P0B78 in a Cadillac hybrid/electric vehicle?

Maintaining a consistent charging routine, avoiding rapid acceleration and deceleration, and minimizing heavy loads on the hybrid/electric system can help prevent issues like OBDII code P0B78.

10. Can extreme weather conditions affect the likelihood of OBDII code P0B78 occurring in a Cadillac hybrid/electric vehicle?

Yes, extreme weather conditions such as extreme cold or heat can impact the performance and efficiency of the hybrid/electric system, potentially leading to issues like OBDII code P0B78.