AutoCodes – Chevrolet – P1B71 Chevrolet

P1B71 Chevrolet 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 Chevrolet 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 1,199

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

What does this mean?

What are the Possible Causes of the DTC P1B71 Chevrolet?

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

How to Fix the DTC P1B71 Chevrolet?

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 Chevrolet 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 P1B71 Chevrolet Code

1. What does the OBDII code P1B71 mean on a Chevrolet?

The code P1B71 indicates a "Hybrid/Electric Vehicle Battery 47 Circuit High Voltage," meaning the vehicle's hybrid or EV battery system has detected an abnormally high voltage in circuit 47.

2. What are the common symptoms of the P1B71 code?

Symptoms may include a check engine light, reduced hybrid or EV performance, issues with charging, or limited vehicle drivability.

3. What causes the P1B71 code in a Chevrolet?

Common causes include a faulty battery cell, damaged wiring or connectors in the circuit, a malfunctioning battery management system, or a defective voltage sensor.

4. Can I still drive my Chevrolet with the P1B71 code?

Itâ€™s not recommended. Driving with this code can cause further damage to the hybrid or EV battery system and may lead to reduced performance or a potential safety risk.

5. How is the P1B71 code diagnosed?

A technician will use an advanced scan tool to read the vehicleâ€™s data, inspect the hybrid battery system, check for damaged wiring, and measure the voltage of circuit 47.

6. What repairs are needed to fix the P1B71 code?

Repairs may involve replacing a faulty battery cell, repairing or replacing damaged wiring or connectors, or recalibrating or replacing the battery management system.

7. How much does it cost to fix the P1B71 code on a Chevrolet?

Costs vary depending on the issue, but repairs can range from a few hundred dollars for wiring repairs to several thousand dollars for battery cell or module replacement.

8. Can I reset the P1B71 code without repairing the issue?

While you can clear the code temporarily with a scan tool, the issue will likely return since the underlying problem hasnâ€™t been fixed.

9. Is the P1B71 code covered under warranty for a Chevrolet hybrid or EV?

It may be covered under the vehicleâ€™s hybrid or EV battery warranty, which typically lasts longer than the standard warranty. Check with your dealer for specifics.

10. What preventative maintenance can help avoid the P1B71 code?

Regularly inspect the battery system, ensure proper electrical connections, avoid exposing the vehicle to extreme temperatures, and follow the manufacturerâ€™s recommended service schedule.