AutoCodes – Generic – P1B7D

P1B7D 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 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 887

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

What does this mean?

What are the Possible Causes of the DTC P1B7D?

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

How to Fix the DTC P1B7D?

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 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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Information for Specific Makes

P1B7D Buick — Hybrid/Electric Vehicle Battery 51 Circuit High Voltage
P1B7D Cadillac — Hybrid/Electric Vehicle Battery 51 Circuit High Voltage
P1B7D Chevrolet — Hybrid/Electric Vehicle Battery 51 Circuit High Voltage
P1B7D GMC — Hybrid/Electric Vehicle Battery 51 Circuit High Voltage
P1B7D Saturn — Hybrid/Electric Vehicle Battery 51 Circuit High Voltage

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 Code

1. What are common symptoms of OBDII code P1B7D (Hybrid/Electric Vehicle Battery 51 Circuit High Voltage)?

- Common symptoms include the illumination of the check engine light, decreased fuel efficiency, and potential issues with the hybrid/electric vehicle's battery performance.

2. What causes OBDII code P1B7D to trigger in a hybrid/electric vehicle?

- This code is typically triggered by a high voltage condition in the Battery 51 circuit, which may be caused by a faulty battery module, damaged wiring, or issues with the battery management system.

3. How serious is OBDII code P1B7D in a hybrid/electric vehicle?

- This code should be addressed promptly as it can impact the vehicle's overall performance and fuel efficiency. Ignoring the issue may lead to more severe problems with the hybrid/electric system.

4. Can I continue driving my hybrid/electric vehicle with OBDII code P1B7D present?

- It is not recommended to continue driving the vehicle with this code active, as it can lead to further damage to the battery system. It's best to have the issue diagnosed and repaired by a qualified technician.

5. How can I diagnose OBDII code P1B7D in my hybrid/electric vehicle?

- Diagnosing this code typically involves using a professional OBDII scanner to retrieve the code and then performing further testing on the Battery 51 circuit, battery modules, and related components.

6. Are there any DIY repair tips for OBDII code P1B7D in a hybrid/electric vehicle?

- DIY repair for this code is not recommended due to the complexity of the hybrid/electric system. It's best to have the vehicle inspected and repaired by a certified mechanic familiar with hybrid/electric systems.

7. Can resetting the OBDII code P1B7D clear the issue in a hybrid/electric vehicle?

- Resetting the code may temporarily turn off the check engine light, but it will not fix the underlying issue causing the high voltage condition in the Battery 51 circuit. Proper diagnosis and repair are necessary.

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

- The cost of repairing this code can vary depending on the specific cause of the issue. It's recommended to get a diagnostic from a qualified technician to determine the exact repair cost.

9. Is OBDII code P1B7D common in hybrid/electric vehicles?

- While not as common as some other OBDII codes, P1B7D can still occur in hybrid/electric vehicles, especially as they age and components wear out.

10. How can I prevent OBDII code P1B7D from occurring in my hybrid/electric vehicle?

- Regular maintenance and inspections of the hybrid/electric system, including the battery and related components, can help prevent issues like OBDII code P1B7D. If you notice any unusual symptoms, have the vehicle checked promptly.