AutoCodes – Buick – P1B7E Buick

P1B7E Buick Code - Hybrid/Electric Vehicle Battery 52 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: P1B7E Buick indicates Hybrid/Electric Vehicle Battery 52 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 938

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 P1B7E 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 P1B7E Buick - Hybrid/Electric Vehicle Battery 52 Circuit Performance - AutoCodes.com — P1B7E Buick Code - Hybrid/Electric Vehicle Battery 52 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P1B7E Buick?

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

How to Fix the DTC P1B7E 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 P1B7E 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.

Need more information about the P1B7E Buick code?

Need more information on how to fix the P1B7E Buick code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1B7E Buick 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 P1B7E Buick Code

1. What does the OBDII code P1B7E mean on a Buick?

P1B7E indicates a performance issue in the circuit associated with Hybrid/Electric Vehicle Battery 52, meaning the control module has detected irregularities.

2. What are the common symptoms of the P1B7E code on a Buick?

Symptoms may include reduced hybrid/electric performance, warning lights on the dashboard, decreased fuel efficiency, or limited electric range.

3. What causes the P1B7E code to appear on a Buick?

The code can be triggered by a faulty battery cell, damaged wiring in the circuit, poor electrical connections, or a failing battery control module.

4. Can I drive my Buick with the P1B7E code?

Itâ€™s not recommended, as continued driving could worsen the issue or lead to further damage in the hybrid/electric system.

5. How is the P1B7E code diagnosed?

A technician will use a scan tool to read the code, inspect the battery circuit wiring, check for voltage imbalances, and test the battery module for faults.

6. What repairs are needed to fix the P1B7E code on a Buick?

Repairs may include replacing a damaged battery cell, repairing or replacing faulty wiring, or reprogramming or replacing the battery control module.

7. How much does it cost to fix the P1B7E code on a Buick?

The cost varies depending on the specific repair, but it can range from $100 for wiring repairs to over $1,000 if a battery module or cell replacement is required.

8. Can I clear the P1B7E code without repairing the issue?

Clearing the code without addressing the underlying problem will likely result in the code returning and could lead to further problems.

9. What tools are needed to troubleshoot the P1B7E code on a Buick?

Diagnostic tools like an OBDII scanner, a multimeter for electrical testing, and manufacturer-specific service information are essential.

10. Is the P1B7E code covered under warranty for a Buick?

It may be covered under the hybrid/electric system warranty, which is often longer than the standard warranty. Check your vehicleâ€™s warranty terms for details.