AutoCodes – GMC – P0B7A GMC

P0B7A GMC Code - Hybrid/Electric Vehicle Battery 13 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: P0B7A GMC indicates Hybrid/Electric Vehicle Battery 13 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 880

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 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0B7A 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 P0B7A GMC - Hybrid/Electric Vehicle Battery 13 Circuit High Voltage - AutoCodes.com — P0B7A GMC Code - Hybrid/Electric Vehicle Battery 13 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0B7A GMC?

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

How to Fix the DTC P0B7A 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 P0B7A 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 P0B7A GMC Code

1. What does the OBDII code P0B7A mean on a GMC vehicle?

The P0B7A code indicates a "Hybrid/Electric Vehicle Battery 13 Circuit High Voltage" issue, meaning the voltage in battery block 13 is higher than expected.

2. What are the common symptoms of the P0B7A code in a GMC?

Symptoms may include the check engine light or hybrid system warning light, reduced fuel efficiency, limited power mode, or the vehicle failing to switch to electric mode.

3. What causes the P0B7A code to appear?

Common causes include a malfunctioning battery cell in block 13, wiring issues, poor electrical connections, or a fault in the battery management system (BMS).

4. Can I continue driving my GMC with the P0B7A code?

Driving with this code is not recommended, as it can lead to further damage to the hybrid battery system and reduced vehicle performance.

5. How do I diagnose the P0B7A code on my GMC?

Diagnosis involves inspecting the high-voltage battery, testing the wiring and connections for battery block 13, and using a scan tool to monitor voltage levels and BMS function.

6. What repairs are needed to fix the P0B7A code?

Repairs may include replacing damaged battery cells, repairing or replacing wiring or connectors, or reprogramming/updating the battery management system.

7. How much does it cost to fix the P0B7A code in a GMC?

Repair costs vary but can range from $200 for minor wiring repairs to over $2,000 if a hybrid battery replacement is required.

8. Can a weak 12V battery cause the P0B7A code?

While the 12V battery is separate from the high-voltage system, a weak 12V battery could potentially affect system diagnostics and should be checked.

9. Does the P0B7A code mean my hybrid battery is failing?

Not necessarily, but it indicates an issue with one section of the battery. Further diagnostics will determine if cell replacement or other repairs are needed.

10. Can the P0B7A code be cleared without repairs?

Clearing the code without addressing the underlying issue is not recommended, as the problem will likely reoccur and could worsen over time.