AutoCodes – GMC – P1B56 GMC

P1B56 GMC 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 GMC 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 817

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 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 P1B56 GMC - Hybrid/Electric Vehicle Battery 38 Circuit High Voltage - AutoCodes.com — P1B56 GMC Code - Hybrid/Electric Vehicle Battery 38 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1B56 GMC?

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

How to Fix the DTC P1B56 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 P1B56 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 P1B56 GMC Code

1. What are the common symptoms of OBDII code P1B56 GMC (Hybrid/Electric Vehicle Battery 38 Circuit High Voltage)?

- The common symptoms include the check engine light coming on, reduced hybrid/electric vehicle performance, and potential issues with battery charging.

2. What are the possible causes of OBDII code P1B56 GMC?

- The code P1B56 GMC can be triggered by issues such as high voltage in the hybrid/electric vehicle battery 38 circuit, damaged wiring, faulty battery components, or a malfunctioning battery management system.

3. How can I diagnose OBDII code P1B56 GMC in my hybrid/electric vehicle?

- Diagnosing this code typically involves using a diagnostic scanner to retrieve the specific fault codes, conducting a visual inspection of the battery and related components, and testing the battery voltage levels using specialized equipment.

4. What are the repair options for OBDII code P1B56 GMC?

- Repair options may include repairing or replacing damaged wiring, addressing any faulty battery components, resetting the battery management system, or seeking professional help from a certified technician familiar with hybrid/electric vehicle systems.

5. Can I continue driving my hybrid/electric vehicle with OBDII code P1B56 GMC?

- It is not recommended to continue driving your vehicle with this code present, as it may lead to further damage to the battery system and potentially compromise the safety and performance of the vehicle.

6. How can I prevent OBDII code P1B56 GMC from occurring in the future?

- To prevent this code from occurring, it is important to regularly maintain your hybrid/electric vehicle, follow the manufacturer's recommended service schedule, and address any issues with the battery system promptly.

7. Is it safe to attempt DIY repairs for OBDII code P1B56 GMC?

- Due to the complex nature of hybrid/electric vehicle systems and the high voltage involved, it is recommended to seek professional help from qualified technicians for repairs related to OBDII code P1B56 GMC.

8. Can a low battery state of charge trigger OBDII code P1B56 GMC?

- A low battery state of charge may contribute to triggering this code, as it can put additional stress on the battery system and lead to voltage irregularities in the hybrid/electric vehicle.

9. What role does the battery management system play in OBDII code P1B56 GMC diagnosis?

- The battery management system is crucial for monitoring and controlling the voltage levels in the hybrid/electric vehicle battery system, making it essential in diagnosing and resolving issues related to code P1B56 GMC.

10. Is resetting the battery management system a viable temporary solution for OBDII code P1B56 GMC?

- Resetting the battery management system may temporarily clear the code, but it is important to identify and address the underlying cause to prevent the code from reoccurring.