AutoCodes – Generic – P1B7F

P1B7F 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 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 1,155

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

What does this mean?

What are the Possible Causes of the DTC P1B7F?

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

How to Fix the DTC P1B7F?

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 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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Need Help with the Code?

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Information for Specific Makes

P1B7F Buick — Hybrid/Electric Vehicle Battery 52 Circuit Low Voltage
P1B7F Cadillac — Hybrid/Electric Vehicle Battery 52 Circuit Low Voltage
P1B7F Chevrolet — Hybrid/Electric Vehicle Battery 52 Circuit Low Voltage
P1B7F GMC — Hybrid/Electric Vehicle Battery 52 Circuit Low Voltage
P1B7F Saturn — Hybrid/Electric Vehicle Battery 52 Circuit Low 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 P1B7F Code

1. What are common symptoms of OBDII code P1B7F (Hybrid/Electric Vehicle Battery 52 Circuit Low Voltage)?

- Common symptoms include decreased performance of the hybrid/electric vehicle, reduced fuel efficiency, and potential difficulty starting the vehicle.

2. What are the possible causes of OBDII code P1B7F?

- The code P1B7F may be triggered by issues such as a faulty battery pack, damaged battery cells, poor battery connection, or issues with the battery management system.

3. How can I diagnose the cause of OBDII code P1B7F?

- Diagnosis typically involves checking the hybrid/electric vehicle battery for physical damage, testing the battery cells, inspecting the battery connections, and using a diagnostic scanner to gather more information about the fault.

4. Can I continue driving my vehicle with OBDII code P1B7F present?

- It is not recommended to continue driving the vehicle with this code present, as it can lead to further damage to the hybrid/electric vehicle battery and potentially cause safety hazards.

5. How can I repair OBDII code P1B7F?

- Repairing this code may involve replacing damaged battery cells, ensuring proper battery connections, resetting the battery management system, or seeking professional help from a certified technician familiar with hybrid/electric vehicles.

6. Are there any DIY tips for addressing OBDII code P1B7F?

- DIY tips may include checking the battery connections for tightness, inspecting the battery for visible damage, and resetting the battery management system by disconnecting the 12V battery for a few minutes.

7. What are the long-term consequences of ignoring OBDII code P1B7F?

- Ignoring this code can lead to further deterioration of the hybrid/electric vehicle battery, decreased performance, reduced fuel efficiency, and potential safety risks while driving.

8. Is it safe to clear the OBDII code P1B7F and continue driving?

- Clearing the code without addressing the underlying issue is not recommended, as the problem may persist and potentially worsen over time. It is best to diagnose and repair the root cause of the code.

9. How much does it typically cost to repair OBDII code P1B7F?

- The cost of repairing this code can vary depending on the extent of the issue and whether professional assistance is required. Costs may include replacement battery cells, labor fees, and diagnostic services.

10. Can extreme weather conditions affect OBDII code P1B7F?

- Yes, extreme weather conditions such as very high or very low temperatures can impact the performance of hybrid/electric vehicle batteries and potentially trigger the P1B7F fault code.