AutoCodes – Buick – P1B7D Buick

P1B7D Buick Code - Hybrid/Electric Vehicle Battery 51 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: P1B7D Buick indicates Hybrid/Electric Vehicle Battery 51 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 741

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 P1B7D 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 P1B7D Buick - Hybrid/Electric Vehicle Battery 51 Circuit High Voltage - AutoCodes.com — P1B7D Buick Code - Hybrid/Electric Vehicle Battery 51 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1B7D Buick?

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

How to Fix the DTC P1B7D 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 P1B7D 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 P1B7D Buick Code

1. What are the common symptoms of OBDII code P1B7D in a Buick hybrid/electric vehicle?

- Common symptoms include check engine light illumination, decreased fuel efficiency, and potential drivability issues.

2. What can cause the OBDII code P1B7D in a Buick hybrid/electric vehicle?

- This code is usually triggered by a high voltage condition detected in the battery 51 circuit, which can be caused by a faulty battery, damaged wiring, or a malfunctioning battery management system.

3. How can I diagnose the OBDII code P1B7D in my Buick hybrid/electric vehicle?

- Diagnosis typically involves using a scan tool to read the code, inspecting the battery 51 circuit components, testing the battery voltage, and checking for any visible signs of damage.

4. What are some possible repair tips for addressing code P1B7D in a Buick hybrid/electric vehicle?

- Repair tips may include replacing a faulty battery, repairing damaged wiring, resetting the battery management system, or updating the vehicle's software to address the high voltage issue.

5. Is it safe to continue driving my Buick hybrid/electric vehicle with OBDII code P1B7D present?

- It is not recommended to drive the vehicle with this code active, as it can lead to further damage to the battery system and potentially pose a safety risk. It's best to address the issue promptly.

6. How much does it typically cost to repair OBDII code P1B7D in a Buick hybrid/electric vehicle?

- The cost of repair can vary depending on the specific cause of the high voltage condition. It is recommended to consult with a qualified mechanic or dealership for an accurate estimate.

7. Can I reset the OBDII code P1B7D in my Buick hybrid/electric vehicle using a simple OBDII scanner?

- While you can clear the code using an OBDII scanner, it is important to diagnose and address the underlying issue causing the high voltage condition to prevent the code from reoccurring.

8. How often does OBDII code P1B7D occur in Buick hybrid/electric vehicles?

- The occurrence of this specific code can vary, but it is relatively uncommon compared to other OBDII codes. Proper maintenance and care of the vehicle's battery system can help prevent it.

9. Are there any recalls or service bulletins related to OBDII code P1B7D in Buick hybrid/electric vehicles?

- It's recommended to check with Buick dealerships or online databases for any relevant recalls or service bulletins related to this specific OBDII code to ensure proper resolution.

10. Can a DIY enthusiast with basic automotive knowledge repair OBDII code P1B7D in a Buick hybrid/electric vehicle?

- While some repairs related to this code may be within reach of a DIY enthusiast, it is recommended to consult with a professional technician or dealership for proper diagnosis and repair to ensure safety and accuracy.