AutoCodes – GMC – P1B7C GMC

P1B7C GMC Code - Hybrid/Electric Vehicle Battery 51 Circuit Low 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: P1B7C GMC indicates Hybrid/Electric Vehicle Battery 51 Circuit Low 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 858

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1B7C 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 P1B7C GMC - Hybrid/Electric Vehicle Battery 51 Circuit Low Voltage - AutoCodes.com — P1B7C GMC Code - Hybrid/Electric Vehicle Battery 51 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B7C GMC?

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

How to Fix the DTC P1B7C 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 P1B7C 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.

Need more information about the P1B7C GMC code?

Need more information on how to fix the P1B7C GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1B7C GMC code diagnosed by a professional: Find a repair shop in your area

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 P1B7C GMC Code

1. What are the common symptoms of OBDII code P1B7C GMC?

- Common symptoms include reduced electric vehicle range, poor battery performance, and potential issues with starting the vehicle.

2. What can cause the Hybrid/Electric Vehicle Battery 51 Circuit Low Voltage code?

- The code P1B7C GMC is typically triggered by a low voltage condition in the hybrid or electric vehicle battery, often caused by a failing battery module or a problem with the battery management system.

3. How can I diagnose the cause of OBDII code P1B7C GMC?

- Diagnosis involves using a diagnostic scanner to retrieve the code, checking the battery voltage levels, inspecting the battery connections, and testing the battery modules for faults.

4. Is it safe to continue driving with the Hybrid/Electric Vehicle Battery 51 Circuit Low Voltage code?

- It is not recommended to continue driving with this code, as it can lead to further damage to the battery system and potentially leave you stranded if the battery fails completely.

5. Can I repair OBDII code P1B7C GMC on my own?

- Repairing this code may require specialized knowledge and tools related to hybrid or electric vehicle systems. It is advisable to seek professional help from a certified technician familiar with electric vehicles.

6. How much does it typically cost to repair OBDII code P1B7C GMC?

- The cost of repair can vary depending on the root cause of the issue. It may involve replacing faulty battery modules, repairing the battery management system, or other related components, potentially costing several hundred to thousand dollars.

7. Are there any maintenance tips to prevent OBDII code P1B7C GMC from recurring?

- Regularly maintaining your hybrid or electric vehicle's battery system, following manufacturer recommendations for charging and usage, and addressing any warning signs promptly can help prevent the code from recurring.

8. Can extreme weather conditions affect the Hybrid/Electric Vehicle Battery 51 Circuit Low Voltage code?

- Yes, extreme temperatures can impact the performance of hybrid or electric vehicle batteries, potentially leading to low voltage conditions and triggering the P1B7C code.

9. How long does it typically take to repair OBDII code P1B7C GMC?

- The repair time can vary depending on the complexity of the issue and the availability of parts. It may take a few hours to a few days to diagnose and fix the problem properly.

10. Can resetting the OBDII code P1B7C GMC on my own solve the issue?

- Resetting the code without addressing the underlying problem is not a permanent solution. It is essential to diagnose and repair the root cause to prevent the code from reappearing.