AutoCodes – Generic – P1E71

P1E71 Code - Hybrid/Electric Vehicle Battery 70 Circuit

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: P1E71 indicates Hybrid/Electric Vehicle Battery 70 Circuit.
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 884

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 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1E71 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 P1E71 - Hybrid/Electric Vehicle Battery 70 Circuit - AutoCodes.com — P1E71 Code - Hybrid/Electric Vehicle Battery 70 Circuit

What does this mean?

What are the Possible Causes of the DTC P1E71?

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

How to Fix the DTC P1E71?

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 P1E71 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

P1E71 Buick — Hybrid/Electric Vehicle Battery 70 Circuit
P1E71 Cadillac — Hybrid/Electric Vehicle Battery 70 Circuit
P1E71 Chevrolet — Hybrid/Electric Vehicle Battery 70 Circuit
P1E71 GMC — Hybrid/Electric Vehicle Battery 70 Circuit
P1E71 Saturn — Hybrid/Electric Vehicle Battery 70 Circuit

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 P1E71 Code

1. What does the OBDII code P1E71 mean?

P1E71 indicates a problem in the Hybrid/Electric Vehicle Battery 70 Circuit, which typically involves the battery management or monitoring system.

2. What are the common symptoms of code P1E71?

Symptoms include reduced vehicle performance, a check engine light or hybrid warning light, and possible issues with battery charging or discharging.

3. What causes the P1E71 code to appear?

Common causes include a faulty battery module, damaged wiring or connectors in the battery circuit, or a malfunctioning battery management system.

4. Can I still drive my vehicle with the P1E71 code?

While it may be possible to drive, it is not recommended as the issue could lead to further damage or reduced safety in hybrid or electric vehicle operation.

5. How is the P1E71 code diagnosed?

A mechanic will use a scan tool to confirm the code, check for additional codes, inspect the battery system wiring and connectors, and test the affected circuit components.

6. How can I fix the P1E71 code?

Repairs may involve replacing a faulty battery module, repairing damaged wiring or connectors, or reprogramming the battery control module if needed.

7. Is the P1E71 code specific to certain vehicle brands?

This code is commonly found in hybrid or electric vehicles and may be more prevalent in certain manufacturers, such as GM or Chevrolet, depending on the model.

8. How much does it cost to repair the P1E71 code?

Repair costs vary widely but can range from $200 to $2,000 or more, depending on whether the issue is related to wiring, software, or battery module replacement.

9. Can a weak 12V battery cause the P1E71 code?

While a weak 12V battery may not directly cause P1E71, it can create electrical issues that might contribute to the problem in the hybrid battery circuit.

10. Do I need to update my vehicleâ€™s software to fix P1E71?

In some cases, updating the battery control module software may resolve the issue, but this depends on the manufacturerâ€™s recommendations and diagnostic results.