AutoCodes – GMC – P1B7F GMC

P1B7F GMC Code - Hybrid/Electric Vehicle Battery 52 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: P1B7F GMC indicates Hybrid/Electric Vehicle Battery 52 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.

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Code Popularity 719

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 P1B7F 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 P1B7F GMC - Hybrid/Electric Vehicle Battery 52 Circuit Low Voltage - AutoCodes.com — P1B7F GMC Code - Hybrid/Electric Vehicle Battery 52 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B7F GMC?

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

How to Fix the DTC P1B7F 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 P1B7F 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 P1B7F GMC Code

1. What are the common symptoms of OBDII code P1B7F in a GMC Hybrid/Electric Vehicle?

- Common symptoms include poor fuel efficiency, loss of power, difficulty starting the vehicle, and the illumination of the check engine light.

2. What are the possible causes of OBDII code P1B7F indicating Hybrid/Electric Vehicle Battery 52 Circuit Low Voltage in a GMC?

- The code P1B7F can be triggered by issues such as a faulty battery, damaged wiring, poor battery connections, or problems with the battery management system.

3. How can I diagnose the Hybrid/Electric Vehicle Battery 52 Circuit Low Voltage issue associated with code P1B7F in my GMC?

- Diagnosing the problem may involve testing the battery voltage, inspecting the battery connections, checking for damaged wiring, and using a diagnostic scanner to read the specific fault codes.

4. Is it safe to continue driving my GMC with the OBDII code P1B7F related to low voltage in the Hybrid/Electric Vehicle Battery 52 Circuit?

- It is not recommended to drive the vehicle with this code active, as it can lead to further damage to the battery system and potentially cause safety issues.

5. How can I repair OBDII code P1B7F in my GMC Hybrid/Electric Vehicle indicating low voltage in the battery circuit?

- Repairing this issue may involve replacing the battery, repairing damaged wiring, ensuring proper battery connections, or reprogramming the battery management system.

6. Can I reset the OBDII code P1B7F related to low voltage in the Hybrid/Electric Vehicle Battery 52 Circuit in my GMC without fixing the underlying issue?

- While you can clear the code temporarily, it is crucial to address the root cause of the problem to prevent it from reoccurring and potentially causing more severe issues.

7. How much does it typically cost to repair OBDII code P1B7F signaling low voltage in the Hybrid/Electric Vehicle Battery 52 Circuit in a GMC?

- The cost of repair can vary depending on the extent of the issue, but it may involve expenses for parts, labor, and diagnostic services.

8. Are there any preventive maintenance tips to avoid triggering code P1B7F in a GMC Hybrid/Electric Vehicle?

- Regularly inspecting the battery system, maintaining proper charging habits, and addressing any warning signs promptly can help prevent issues leading to code P1B7F.

9. Can a DIY enthusiast with basic automotive knowledge fix OBDII code P1B7F related to low voltage in a GMC Hybrid/Electric Vehicle?

- While some basic troubleshooting steps can be performed, diagnosing and repairing complex electrical issues like this code may require specialized tools and expertise, so professional assistance is often recommended.

10. How long does it typically take to repair OBDII code P1B7F associated with low voltage in the Hybrid/Electric Vehicle Battery 52 Circuit in a GMC?

- The repair time can vary based on the specific cause of the issue, but it may take anywhere from a few hours to a full day, depending on the complexity of the repair needed.