AutoCodes – Generic – P1B71

P1B71 Code - Hybrid/Electric Vehicle Battery 47 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: P1B71 indicates Hybrid/Electric Vehicle Battery 47 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 6,417

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 P1B71 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 P1B71 - Hybrid/Electric Vehicle Battery 47 Circuit High Voltage - AutoCodes.com — P1B71 Code - Hybrid/Electric Vehicle Battery 47 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1B71?

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

How to Fix the DTC P1B71?

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 P1B71 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?

Get the P1B71 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1B71 Buick — Hybrid/Electric Vehicle Battery 47 Circuit High Voltage
P1B71 Cadillac — Hybrid/Electric Vehicle Battery 47 Circuit High Voltage
P1B71 Chevrolet — Hybrid/Electric Vehicle Battery 47 Circuit High Voltage
P1B71 GMC — Hybrid/Electric Vehicle Battery 47 Circuit High Voltage
P1B71 Saturn — Hybrid/Electric Vehicle Battery 47 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 P1B71 Code

1. What are common symptoms of OBDII code P1B71?

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

2. What are possible causes of OBDII code P1B71?

- Possible causes may include a malfunctioning high voltage battery 47 circuit, a faulty battery pack, damaged wiring or connectors related to the high voltage circuit, or issues with the battery management system.

3. How can I diagnose OBDII code P1B71?

- Diagnosis typically involves using an OBDII scanner to retrieve the specific code, inspecting the high voltage battery 47 circuit for any visible damage, and testing the battery and related components for proper functioning.

4. Can OBDII code P1B71 be repaired at home?

- Repairing this code may require specialized knowledge and equipment due to the high voltage nature of the hybrid/electric vehicle system. It is recommended to seek professional help for diagnosis and repair.

5. Is it safe to drive with OBDII code P1B71 active?

- It is not recommended to drive the vehicle with this code active, as it can indicate potential issues with the high voltage system, which may pose safety risks. Seek professional assistance to address the problem promptly.

6. What are some tips for preventing OBDII code P1B71 from recurring?

- Regular maintenance of the hybrid/electric vehicle's high voltage system, including checking for loose connections, ensuring proper cooling of the battery pack, and following manufacturer recommendations for battery care, can help prevent this code from recurring.

7. How much does it typically cost to repair OBDII code P1B71?

- The cost of repair can vary depending on the underlying cause of the code and the extent of the damage. It is advisable to obtain a diagnosis from a qualified technician to determine the exact repair cost.

8. Can OBDII code P1B71 be a false alarm?

- While rare, false alarms can occur with OBDII codes. It is recommended to have the vehicle properly diagnosed by a professional to confirm the accuracy of the code and address any potential issues.

9. Is resetting the check engine light enough to fix OBDII code P1B71?

- Simply resetting the check engine light will not fix the underlying issue causing OBDII code P1B71. It is important to diagnose the problem properly and address any repairs needed to prevent the code from reoccurring.

10. What should I do if I encounter OBDII code P1B71 while driving?

- If you encounter this code while driving, it is best to pull over safely, turn off the vehicle, and seek assistance from a qualified technician to avoid any potential risks associated with high voltage systems in hybrid/electric vehicles.