AutoCodes – Chevrolet – P1B73 Chevrolet

P1B73 Chevrolet Code - Hybrid/Electric Vehicle Battery 48 Circuit Low 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: P1B73 Chevrolet indicates Hybrid/Electric Vehicle Battery 48 Circuit Low 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 1,195

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 P1B73 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 P1B73 Chevrolet - Hybrid/Electric Vehicle Battery 48 Circuit Low Voltage - AutoCodes.com — P1B73 Chevrolet Code - Hybrid/Electric Vehicle Battery 48 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B73 Chevrolet?

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

How to Fix the DTC P1B73 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 P1B73 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 P1B73 Chevrolet Code

1. What does the OBDII code P1B73 mean on a Chevrolet?

The P1B73 code indicates a low voltage issue in the 48-volt circuit of the hybrid or electric vehicle battery system.

2. What are the common symptoms of the P1B73 code?

Common symptoms include reduced hybrid system performance, warning lights on the dashboard, decreased fuel efficiency, or the vehicle entering limp mode.

3. What causes the P1B73 code on a Chevrolet vehicle?

Possible causes include a faulty 48-volt battery, damaged wiring or connectors in the 48V circuit, a defective battery management system (BMS), or a malfunctioning voltage sensor.

4. Can driving with the P1B73 code damage my vehicle?

Yes, driving with this code can lead to further damage to the hybrid battery system or related components and may reduce overall vehicle performance.

5. How do I diagnose the P1B73 code?

Diagnosis involves checking the 48-volt battery for proper voltage, inspecting wiring and connectors for damage or corrosion, and testing the battery management system and voltage sensor.

6. Can a discharged 48-volt battery trigger the P1B73 code?

Yes, a discharged or failing 48-volt battery can result in low voltage and trigger the P1B73 code.

7. How is the P1B73 code typically fixed?

Repairs may include replacing the 48-volt battery, repairing or replacing damaged wiring or connectors, reprogramming or replacing the battery management system, or addressing issues with the voltage sensor.

8. Is the P1B73 code covered under warranty for Chevrolet hybrids?

This depends on the specific warranty coverage for your vehicle, but hybrid battery components are often covered under extended warranties.

9. Can a software issue cause the P1B73 code?

Yes, outdated or corrupted software in the battery management system can sometimes cause this code and may require a software update.

10. How much does it cost to fix the P1B73 code?

Repair costs can vary widely, ranging from $100 for minor wiring repairs to over $1,000 if the 48-volt battery or battery management system needs replacement.