AutoCodes – Buick – P1B7A Buick

P1B7A Buick 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 Buick 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.

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Code Popularity 727

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

What does this mean?

What are the Possible Causes of the DTC P1B7A Buick?

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

How to Fix the DTC P1B7A Buick?

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 Buick 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 P1B7A Buick Code

1. What does OBDII code P1B7A mean on a Buick?

P1B7A indicates a "Hybrid/Electric Vehicle Battery 50 Circuit High Voltage" issue, meaning the powertrain control module has detected a high voltage condition in a specific battery circuit.

2. What are the common symptoms of code P1B7A in a Buick?

Symptoms may include the illumination of the check engine light, reduced hybrid or electric performance, lower fuel efficiency, or the vehicle entering limp mode.

3. What causes code P1B7A in a Buick?

Common causes include a malfunctioning hybrid battery module, damaged wiring, loose connections in the battery circuit, or a faulty battery control module.

4. Can I drive my Buick with code P1B7A?

It is not recommended to drive with this code, as the issue may cause further damage to the hybrid/electric system or lead to unsafe driving conditions.

5. How is code P1B7A diagnosed?

A technician typically uses a scan tool to read the code, inspects the high-voltage battery system, checks the wiring and connectors, and tests the battery control module.

6. What repairs are needed to fix code P1B7A on a Buick?

Repairs may include replacing or repairing damaged wiring, fixing loose connections, replacing a faulty hybrid battery module, or reprogramming the battery control module.

7. How much does it cost to fix code P1B7A in a Buick?

Repair costs vary widely depending on the exact cause, but replacing a hybrid battery module can range from $1,000 to $4,000 or more, while wiring repairs are generally less expensive.

8. Can a weak 12-volt battery trigger code P1B7A on a Buick?

A weak 12-volt battery is unlikely to cause this code, as it specifically relates to the high-voltage circuit in the hybrid battery system.

9. Does code P1B7A mean the hybrid battery needs replacement?

Not always. The issue could be related to wiring, connectors, or the control module, so a full diagnostic is necessary before determining if the battery needs replacement.

10. How can I prevent code P1B7A from occurring in my Buick?

Regular maintenance, ensuring high-voltage system components are inspected periodically, and addressing any electrical issues promptly can help prevent this code.