AutoCodes – Buick – P1B7F Buick

P1B7F Buick 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 Buick 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 852

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

What does this mean?

What are the Possible Causes of the DTC P1B7F Buick?

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

How to Fix the DTC P1B7F 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 P1B7F 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 P1B7F Buick Code

1. What does the OBDII code P1B7F mean on a Buick?

The P1B7F code indicates a "Hybrid/Electric Vehicle Battery 52 Circuit Low Voltage," meaning there is an issue with the voltage level of battery cell 52 in the high-voltage battery pack.

2. What are the common symptoms of the P1B7F code?

Symptoms may include a check engine light or hybrid system warning, reduced fuel efficiency, poor vehicle performance, or limited electric mode operation.

3. What causes the P1B7F code to appear?

Common causes include a faulty battery cell, corroded or damaged wiring, a defective battery management system (BMS), or issues with the battery voltage sensor.

4. Can I still drive my Buick with the P1B7F code?

While the vehicle may still operate, it is not recommended to continue driving as the hybrid system may be compromised, potentially leading to further damage or reduced performance.

5. How is the P1B7F code diagnosed?

A technician will use a scan tool to access the hybrid battery voltage data, inspect the wiring and connectors, and test the affected battery module for proper function.

6. How much does it cost to repair the P1B7F code?

Repair costs can vary widely depending on the issue. Replacing a faulty battery cell or module can range from $500 to $2,000, while wiring repairs or sensor replacements may cost less.

7. Can a low 12-volt battery cause the P1B7F code?

No, the P1B7F code specifically relates to the voltage of a cell in the high-voltage hybrid battery and is not caused by issues with the 12-volt system.

8. What happens if the P1B7F code is ignored?

Ignoring the code may lead to further hybrid system damage, reduced performance, or even complete failure of the high-voltage battery.

9. Is it possible to fix the P1B7F code without replacing the battery?

Yes, in some cases, the issue may be resolved by repairing wiring, replacing a sensor, or balancing the battery pack instead of replacing the entire battery.

10. Do I need specialized tools to fix the P1B7F code?

Yes, diagnosing and repairing the P1B7F code typically requires specialized diagnostic tools and safety equipment to handle high-voltage systems safely.