AutoCodes – Generic – P1E73

P1E73 Code - Hybrid/Electric Vehicle Battery 72 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: P1E73 indicates Hybrid/Electric Vehicle Battery 72 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 1,539

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 P1E73 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 P1E73 - Hybrid/Electric Vehicle Battery 72 Circuit - AutoCodes.com — P1E73 Code - Hybrid/Electric Vehicle Battery 72 Circuit

What does this mean?

What are the Possible Causes of the DTC P1E73?

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

How to Fix the DTC P1E73?

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 P1E73 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

P1E73 Buick — Hybrid/Electric Vehicle Battery 72 Circuit
P1E73 Cadillac — Hybrid/Electric Vehicle Battery 72 Circuit
P1E73 Chevrolet — Hybrid/Electric Vehicle Battery 72 Circuit
P1E73 GMC — Hybrid/Electric Vehicle Battery 72 Circuit
P1E73 Saturn — Hybrid/Electric Vehicle Battery 72 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 P1E73 Code

1. What does the OBDII code P1E73 mean?

P1E73 indicates an issue with the Hybrid/Electric Vehicle Battery 72 Circuit, which typically relates to a fault in the high-voltage battery system or its wiring.

2. What are the common symptoms of code P1E73?

Common symptoms include the check engine light turning on, reduced hybrid or electric vehicle performance, and possible inability to charge the high-voltage battery.

3. What causes the P1E73 code to appear?

This code can be triggered by faulty wiring, a malfunctioning battery control module, corrosion on electrical connectors, or a defect in the high-voltage battery.

4. Can I drive my vehicle with code P1E73?

Driving with this code is not recommended, as it may lead to further damage to the hybrid battery system and could reduce vehicle performance.

5. How is the P1E73 code diagnosed?

A technician will use a scan tool to confirm the code, inspect the battery circuit wiring for damage or corrosion, and test the battery control module for faults.

6. What repairs can fix the P1E73 code?

Repairs may include replacing damaged wiring, cleaning or replacing corroded connectors, reprogramming or replacing the battery control module, or servicing the high-voltage battery.

7. How much does it cost to fix code P1E73?

Repair costs can vary widely, ranging from $150 for wiring repairs to over $2,000 if the high-voltage battery needs replacement.

8. Can a low 12V battery cause code P1E73?

While unlikely, a weak or failing 12V battery can sometimes lead to communication errors in hybrid systems, potentially contributing to this code.

9. How can I prevent code P1E73 from occurring?

Regular maintenance of the hybrid system, including checking for corrosion on connectors and ensuring proper battery cooling, can help prevent this code.

10. Is P1E73 specific to certain vehicle brands?

P1E73 is more commonly associated with hybrid or electric vehicles from manufacturers like Chevrolet, but it can appear in other brands with similar systems. Always check your vehicle's service manual for specifics.