AutoCodes – Saturn – P1E72 Saturn

P1E72 Saturn Code - Hybrid/Electric Vehicle Battery 71 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: P1E72 Saturn indicates Hybrid/Electric Vehicle Battery 71 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 724

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 P1E72 Saturn 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 P1E72 Saturn - Hybrid/Electric Vehicle Battery 71 Circuit - AutoCodes.com — P1E72 Saturn Code - Hybrid/Electric Vehicle Battery 71 Circuit

What does this mean?

What are the Possible Causes of the DTC P1E72 Saturn?

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

How to Fix the DTC P1E72 Saturn?

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 P1E72 Saturn 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 P1E72 Saturn Code

1. What does the OBDII code P1E72 mean on a Saturn vehicle?

P1E72 indicates an issue with the Hybrid/Electric Vehicle Battery 71 Circuit, typically related to voltage inconsistencies or communication faults in the battery pack.

2. What are the common symptoms of the P1E72 code?

Symptoms may include the check engine light turning on, reduced fuel efficiency, limited electric vehicle performance, or the vehicle entering a fail-safe or reduced power mode.

3. What causes the P1E72 code to appear?

The code can be caused by a faulty battery cell, damaged wiring or connectors, a malfunctioning battery control module, or software issues in the hybrid/electric system.

4. Can I drive my Saturn with the P1E72 code?

Driving with this code is not recommended, as it may lead to reduced performance or additional damage to the hybrid/electric battery system.

5. How is the P1E72 code diagnosed?

A technician will use a scan tool to read the code, inspect the battery system for wiring or connector damage, and perform voltage and resistance tests on the battery and related circuits.

6. What repairs are commonly needed for the P1E72 code?

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

7. How much does it cost to fix the P1E72 code?

The cost varies depending on the issue, but repairs can range from $200 for wiring fixes to over $1,000 if the battery module needs replacement.

8. Can a software update resolve the P1E72 code on a Saturn?

In some cases, a software update for the battery control module may resolve the issue if it is related to communication errors.

9. What tools are needed to troubleshoot the P1E72 code?

Tools include an OBDII scan tool, a multimeter for voltage testing, and possibly a battery diagnostic tool specific to hybrid or electric vehicles.

10. How can I prevent the P1E72 code from recurring?

Regular maintenance of the hybrid/electric battery system, ensuring clean and secure connections, and promptly addressing any warning lights can help prevent this code.