AutoCodes – Cadillac – P0B77 Cadillac

P0B77 Cadillac 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 Cadillac 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 965

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

What does this mean?

What are the Possible Causes of the DTC P0B77 Cadillac?

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

How to Fix the DTC P0B77 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 P0B77 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 P0B77 Cadillac Code

1. What are the common symptoms of OBDII code P0B77 in a Cadillac Hybrid/Electric Vehicle?

- Common symptoms include reduced hybrid system performance, decreased fuel efficiency, and potential issues with battery charging.

2. What are the possible causes of the P0B77 Cadillac code related to the Hybrid/Electric Vehicle Battery 13 Circuit?

- The code can be triggered by issues such as a faulty high voltage battery pack, damaged wiring harnesses, or problems with the battery management system.

3. How can I diagnose the P0B77 code in my Cadillac Hybrid/Electric Vehicle?

- Diagnosing the code involves using a scan tool to access the hybrid system's control module and checking for any stored fault codes related to the battery 13 circuit.

4. Is it safe to continue driving my Cadillac with the P0B77 code present?

- It is not recommended to drive the vehicle with the code active, as it can lead to further damage to the hybrid/electric system and potentially pose safety risks.

5. Can I repair the P0B77 code issue in my Cadillac Hybrid/Electric Vehicle on my own?

- Repairing the code often requires specialized knowledge and tools related to hybrid/electric systems, so it is advisable to seek assistance from a qualified technician or dealership.

6. How much does it typically cost to repair the P0B77 code in a Cadillac Hybrid/Electric Vehicle?

- The cost of repairs can vary depending on the specific cause of the code, but it may involve expenses for parts replacement, labor, and diagnostic services.

7. Are there any preventive maintenance tips to avoid the P0B77 code in a Cadillac Hybrid/Electric Vehicle?

- Regularly inspecting the high voltage battery system, keeping up with scheduled maintenance, and avoiding overloading the electrical system can help prevent issues leading to the code.

8. What are the potential risks of ignoring the P0B77 code in my Cadillac Hybrid/Electric Vehicle?

- Ignoring the code can result in further damage to the hybrid/electric system, potential safety hazards, and increased repair costs in the long run.

9. Can the P0B77 code be intermittent or is it typically a persistent issue?

- The code can sometimes be intermittent, but it is important to address it promptly to prevent any underlying issues from worsening.

10. How long does it usually take to repair the P0B77 code in a Cadillac Hybrid/Electric Vehicle?

- The repair duration can vary depending on the complexity of the issue, availability of parts, and the technician's experience, but it may take a few hours to a few days to resolve.