AutoCodes – Buick – P1B7C Buick

P1B7C Buick Code - Hybrid/Electric Vehicle Battery 51 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: P1B7C Buick indicates Hybrid/Electric Vehicle Battery 51 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.

Save to My Repairs My Repairs

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

Code Popularity 856

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 P1B7C 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 P1B7C Buick - Hybrid/Electric Vehicle Battery 51 Circuit Low Voltage - AutoCodes.com — P1B7C Buick Code - Hybrid/Electric Vehicle Battery 51 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B7C Buick?

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

How to Fix the DTC P1B7C 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 P1B7C 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 P1B7C Buick code?

Need more information on how to fix the P1B7C Buick code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1B7C 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 P1B7C Buick Code

What does the OBDII code P1B7C mean for my Buick?

The code P1B7C indicates a low voltage condition in the Hybrid/Electric Vehicle Battery 51 circuit, which could affect the vehicle's hybrid system performance.

What are common symptoms of the P1B7C code?

Common symptoms include reduced power output, hybrid system warning lights on the dashboard, and poor fuel efficiency.

What could cause the P1B7C code to trigger?

Causes can include a failing hybrid battery, loose or corroded electrical connections, damaged wiring in the battery circuit, or a malfunctioning battery management system.

How can I diagnose the P1B7C code?

To diagnose, start by checking the battery voltage and connections. Use a multimeter to test the voltage levels in the Hybrid/Electric Vehicle Battery 51 circuit and inspect for any signs of damage or corrosion.

What repairs are needed for the P1B7C code?

Repairs may involve tightening or cleaning electrical connections, replacing damaged wiring, or, in some cases, replacing the hybrid battery if it is found to be faulty.

Can I drive my Buick with the P1B7C code?

While it may be possible to drive the vehicle, itâ€™s not recommended as it can lead to further damage to the hybrid system and reduce overall performance.

How can I prevent the P1B7C code from occurring?

Regular maintenance of the hybrid battery system, including checking connections and ensuring proper voltage levels, can help prevent this code from occurring.

Is it safe to reset the P1B7C code after repairs?

Yes, after addressing the underlying issue, it is safe to reset the code. However, ensure that all repairs are complete, as the code may reappear if the problem persists.

Will clearing the P1B7C code fix my vehicle?

Clearing the code will not fix the vehicle; it only removes the error message. The underlying issue must be repaired to prevent the code from returning.