AutoCodes – GMC – P1B7A GMC

P1B7A GMC Code - Hybrid/Electric Vehicle Battery 50 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: P1B7A GMC indicates Hybrid/Electric Vehicle Battery 50 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.

Save to My Repairs My Repairs

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

Code Popularity 772

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 P1B7A 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 P1B7A GMC - Hybrid/Electric Vehicle Battery 50 Circuit High Voltage - AutoCodes.com — P1B7A GMC Code - Hybrid/Electric Vehicle Battery 50 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1B7A GMC?

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

How to Fix the DTC P1B7A 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 P1B7A 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 P1B7A GMC code?

Need more information on how to fix the P1B7A GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1B7A 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 P1B7A GMC Code

1. What does the OBDII code P1B7A mean on a GMC vehicle?

P1B7A indicates a "Hybrid/Electric Vehicle Battery 50 Circuit High Voltage," meaning the voltage detected in a specific battery circuit is higher than expected.

2. What are the common symptoms of the P1B7A code on a GMC?

Symptoms may include a check engine light, reduced hybrid or electric system performance, decreased fuel efficiency, or a vehicle failing to start.

3. What causes the P1B7A code to appear?

Common causes include a faulty battery module, damaged wiring in the high-voltage circuit, a malfunctioning battery sensor, or a problem with the hybrid battery control module.

4. Can I drive my GMC with the P1B7A code?

Itâ€™s not recommended to drive the vehicle with this code, as it could lead to further damage to the hybrid battery system or cause unsafe driving conditions.

5. How is the P1B7A code diagnosed?

A technician will use a scan tool to check for related codes, inspect the battery system wiring and connectors, and test the high-voltage battery and control module.

6. What repairs are typically needed for a P1B7A code?

Repairs may involve replacing a damaged battery module, repairing or replacing wiring in the high-voltage circuit, or replacing the hybrid battery control module.

7. How much does it cost to fix the P1B7A code on a GMC?

Repair costs vary depending on the specific issue but can range from $300 for wiring repairs to over $1,000 for module replacements or battery repairs.

8. Can a weak 12V battery cause the P1B7A code?

While unlikely, a weak 12V battery can sometimes affect hybrid system diagnostics, so itâ€™s worth checking the 12V battery before proceeding.

9. Does the P1B7A code indicate a hybrid battery failure?

Not necessarily. It could be a wiring or sensor issue rather than a complete battery failure, but further diagnosis is required.

10. How can I prevent the P1B7A code from recurring?

Regular maintenance of the hybrid system, ensuring all wiring and connectors are in good condition, and addressing issues promptly can help prevent this code.