AutoCodes – Generic – P1B7B

P1B7B Code - Hybrid/Electric Vehicle Battery 51 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: P1B7B indicates Hybrid/Electric Vehicle Battery 51 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.

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Code Popularity 842

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 P1B7B 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 P1B7B - Hybrid/Electric Vehicle Battery 51 Circuit Performance - AutoCodes.com — P1B7B Code - Hybrid/Electric Vehicle Battery 51 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P1B7B?

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

How to Fix the DTC P1B7B?

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 P1B7B 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

P1B7B Buick — Hybrid/Electric Vehicle Battery 51 Circuit Performance
P1B7B Cadillac — Hybrid/Electric Vehicle Battery 51 Circuit Performance
P1B7B Chevrolet — Hybrid/Electric Vehicle Battery 51 Circuit Performance
P1B7B GMC — Hybrid/Electric Vehicle Battery 51 Circuit Performance
P1B7B Saturn — Hybrid/Electric Vehicle Battery 51 Circuit Performance

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 P1B7B Code

1. What are the common symptoms of OBDII code P1B7B (Hybrid/Electric Vehicle Battery 51 Circuit Performance)?

- Common symptoms include reduced hybrid system performance, decreased fuel efficiency, and potential illumination of the check engine light.

2. What are some possible causes of OBDII code P1B7B?

- Causes may include issues with the hybrid/electric vehicle battery, faulty battery management system, wiring problems, or a malfunctioning battery temperature sensor.

3. How can I diagnose OBDII code P1B7B?

- Diagnosing this code typically involves using a scan tool to retrieve the code, checking for any related codes, inspecting the hybrid/electric vehicle battery connections and wiring, and testing the battery temperature sensor.

4. Can I drive my vehicle with OBDII code P1B7B active?

- It is not recommended to drive the vehicle with this code active, as it may lead to further damage to the hybrid/electric vehicle battery system and affect overall vehicle performance.

5. What are the repair options for OBDII code P1B7B?

- Repair options may include repairing or replacing damaged wiring, replacing the battery temperature sensor, resetting the fault codes, or potentially replacing the hybrid/electric vehicle battery if necessary.

6. How urgent is it to address OBDII code P1B7B?

- It is important to address this code promptly to prevent further issues with the hybrid/electric vehicle battery system and maintain the optimal functioning of the vehicle.

7. Can I reset OBDII code P1B7B on my own?

- While you can attempt to clear the code with an OBDII scan tool, it is recommended to diagnose and address the underlying issue causing the code to prevent it from reoccurring.

8. What role does the battery management system play in relation to OBDII code P1B7B?

- The battery management system is crucial in monitoring and controlling the hybrid/electric vehicle battery, and issues with this system can lead to the triggering of code P1B7B.

9. Are there any preventive maintenance tips to avoid OBDII code P1B7B?

- Regularly inspecting the hybrid/electric vehicle battery system, maintaining proper charging habits, and addressing any warning signs promptly can help prevent OBDII code P1B7B from occurring.

10. How long does it typically take to repair OBDII code P1B7B?

- The repair time for OBDII code P1B7B can vary depending on the underlying cause and the extent of the repairs needed. It is advisable to consult with a qualified technician for a more accurate estimate.