AutoCodes – GMC – P1B7B GMC

P1B7B GMC Code - Hybrid/Electric Vehicle Battery 51 Circuit Performance

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: P1B7B GMC indicates Hybrid/Electric Vehicle Battery 51 Circuit Performance.
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 814

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 P1B7B 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 P1B7B GMC - Hybrid/Electric Vehicle Battery 51 Circuit Performance - AutoCodes.com — P1B7B GMC Code - Hybrid/Electric Vehicle Battery 51 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P1B7B GMC?

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

How to Fix the DTC P1B7B 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 P1B7B 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 P1B7B GMC code?

Need more information on how to fix the P1B7B GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1B7B 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 P1B7B GMC Code

1. What are the common symptoms of OBDII code P1B7B in a GMC Hybrid/Electric Vehicle?

- Common symptoms include check engine light illumination, reduced hybrid/electric vehicle performance, and potential difficulty starting the vehicle.

2. What does the OBDII code P1B7B GMC indicate about the Hybrid/Electric Vehicle Battery 51 Circuit Performance?

- This code indicates a performance issue with the Battery 51 circuit in a GMC Hybrid/Electric Vehicle, potentially affecting the battery's efficiency and overall function.

3. What are the possible causes of the P1B7B code in a GMC Hybrid/Electric Vehicle?

- Causes may include a faulty Battery 51 module, wiring issues in the circuit, software glitches, or problems with other components related to the hybrid/electric system.

4. How can I diagnose the OBDII code P1B7B in my GMC Hybrid/Electric Vehicle?

- Diagnosis typically involves using a professional OBDII scanner to retrieve the code, inspecting the Battery 51 circuit for any visible damage, and conducting a thorough system check.

5. Can I continue driving my GMC Hybrid/Electric Vehicle with the P1B7B code present?

- It is not recommended to continue driving with the P1B7B code present, as it can potentially lead to further damage to the hybrid/electric system and compromise vehicle performance.

6. What are some repair tips for addressing the P1B7B code in a GMC Hybrid/Electric Vehicle?

- Repair tips may include checking and repairing any damaged wiring in the Battery 51 circuit, resetting the system, updating software if necessary, and consulting a professional technician for further assistance.

7. Is it possible to reset the OBDII code P1B7B in a GMC Hybrid/Electric Vehicle without fixing the underlying issue?

- While it is possible to clear the code temporarily, it is crucial to address the root cause of the problem to prevent it from recurring and potentially causing more severe issues in the future.

8. How much does it typically cost to repair the Hybrid/Electric Vehicle Battery 51 Circuit Performance issue in a GMC vehicle?

- Repair costs can vary depending on the extent of the damage and the specific components that need to be addressed, but it is advisable to consult a professional technician for an accurate estimate.

9. Can a DIY enthusiast with automotive experience fix the P1B7B code in a GMC Hybrid/Electric Vehicle?

- While some basic troubleshooting and repairs may be possible for DIY enthusiasts, addressing complex issues related to hybrid/electric systems, such as the Battery 51 circuit, is best left to experienced professionals due to the specialized nature of the components involved.

10. How can I prevent the OBDII code P1B7B from reoccurring in my GMC Hybrid/Electric Vehicle?

- Regular maintenance, timely inspections of the hybrid/electric system, avoiding harsh driving conditions, and addressing any warning signs promptly can help prevent the recurrence of the P1B7B code in a GMC vehicle.