AutoCodes – Cadillac – P1B56 Cadillac

P1B56 Cadillac Code - Hybrid/Electric Vehicle Battery 38 Circuit High Voltage

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: P1B56 Cadillac indicates Hybrid/Electric Vehicle Battery 38 Circuit High Voltage.
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 12, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1B56 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 P1B56 Cadillac - Hybrid/Electric Vehicle Battery 38 Circuit High Voltage - AutoCodes.com — P1B56 Cadillac Code - Hybrid/Electric Vehicle Battery 38 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1B56 Cadillac?

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

How to Fix the DTC P1B56 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 P1B56 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 P1B56 Cadillac Code

1. What are the common symptoms of OBDII code P1B56 on a Cadillac Hybrid/Electric Vehicle?

- Common symptoms include reduced vehicle performance, decreased fuel efficiency, and potential warning lights on the dashboard related to the high voltage battery system.

2. What does the OBDII code P1B56 Cadillac Hybrid/Electric Vehicle Battery 38 Circuit High Voltage indicate?

- This code indicates that there is a high voltage condition detected in the 38 circuit of the hybrid/electric vehicle's battery system.

3. What are the possible causes of OBDII code P1B56 on a Cadillac Hybrid/Electric Vehicle?

- Possible causes include a malfunctioning battery management system, a fault in the high voltage wiring, a problem with battery temperature sensors, or issues with the battery cells themselves.

4. How can I diagnose the OBDII code P1B56 on my Cadillac Hybrid/Electric Vehicle?

- To diagnose this code, it is recommended to use a diagnostic scanner to retrieve the specific fault codes, inspect the high voltage wiring for any visible damage, and test the battery cells and sensors for proper functionality.

5. Can I continue driving my Cadillac with the OBDII code P1B56 present?

- It is not recommended to drive the vehicle with this code present as it can lead to further damage to the high voltage battery system and may result in unsafe driving conditions.

6. Are there any repair tips for fixing OBDII code P1B56 on a Cadillac Hybrid/Electric Vehicle?

- Repair tips include checking and repairing any damaged wiring, replacing faulty battery temperature sensors, resetting the battery management system, and ensuring proper battery cell operation.

7. How much does it typically cost to repair OBDII code P1B56 on a Cadillac Hybrid/Electric Vehicle?

- Repair costs can vary depending on the exact cause of the code, but they can range from a few hundred to a few thousand dollars, especially if battery components need to be replaced.

8. Is it safe to attempt to reset the OBDII code P1B56 on my Cadillac Hybrid/Electric Vehicle using a diagnostic tool?

- While resetting the code may temporarily clear the warning light, it is crucial to diagnose and address the underlying issue causing the code to prevent further problems with the high voltage battery system.

9. Can a DIY enthusiast fix OBDII code P1B56 on a Cadillac Hybrid/Electric Vehicle?

- Due to the complex nature of the high voltage battery system in hybrid/electric vehicles, it is recommended to seek professional help or specialized technicians for diagnosing and repairing this code.

10. How can I prevent OBDII code P1B56 from appearing on my Cadillac Hybrid/Electric Vehicle in the future?

- Regular maintenance of the high voltage battery system, including checking wiring integrity, monitoring battery health, and addressing any warning lights promptly, can help prevent the recurrence of this code.