AutoCodes – Cadillac – P1B71 Cadillac

P1B71 Cadillac 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 Cadillac 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 822

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

What does this mean?

What are the Possible Causes of the DTC P1B71 Cadillac?

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

How to Fix the DTC P1B71 Cadillac?

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 Cadillac 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 Cadillac Code

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

P1B71 indicates a high voltage issue in the Hybrid/Electric Vehicle Battery 47 circuit, which may affect the battery's performance or electrical system.

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

Symptoms may include warning lights on the dashboard, reduced hybrid or EV performance, poor acceleration, or the vehicle not starting.

3. What causes the P1B71 code to trigger?

The code can be caused by a faulty battery module, damaged wiring or connectors in the circuit, a malfunctioning battery control module, or high voltage imbalances.

4. Can I drive my Cadillac with the P1B71 code?

Itâ€™s not recommended to drive with this code active, as it may lead to further damage to the hybrid battery system or reduced vehicle reliability.

5. How is the P1B71 code diagnosed?

A technician will use a scan tool to confirm the code, inspect the high-voltage circuit and connectors, and test the battery modules for irregularities.

6. What repairs are typically needed for the P1B71 code?

Repairs may include replacing a damaged battery module, repairing or replacing wiring and connectors, or reprogramming or replacing the battery control module.

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

Repair costs can vary widely, ranging from $200 for minor wiring repairs to over $1,000 if the battery control module or battery pack needs replacement.

8. Can a low 12V battery cause the P1B71 code?

A low or failing 12V battery is unlikely to cause this specific code, as it relates to the high-voltage circuit in the hybrid system.

9. Will resetting the code fix the issue?

Clearing the code without addressing the underlying problem will not fix the issue, and the code is likely to return.

10. Is the P1B71 code covered under warranty for Cadillac vehicles?

Depending on the vehicleâ€™s warranty and age, issues related to the hybrid battery system may be covered under a manufacturerâ€™s warranty. Check with your dealer for details.