AutoCodes – Chevrolet – P1B44 Chevrolet

P1B44 Chevrolet Code - Drive Motor 2 Control Module Hybrid/EV Battery Voltage Isolation Sensing Circuit 2 High Voltage

Quick Answer

The power inverter module, often referred to as the drive motor generator power inverter module, contains three motor control modules and the hybrid/EV powertrain control module 1. Common causes include Faulty Hybrid/Electric Vehicle Battery Pack. 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: P1B44 Chevrolet indicates Drive Motor 2 Control Module Hybrid/EV Battery Voltage Isolation Sensing Circuit 2 High Voltage.
Common causes: Common causes include Faulty Hybrid/Electric Vehicle Battery Pack.
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 1,086

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 P1B44 Chevrolet Description

The power inverter module, often referred to as the drive motor generator power inverter module, contains three motor control modules and the hybrid/EV powertrain control module 1. Two of the motor control modules operate their respective drive motor based upon power inverter module commands. The third motor control module controls the auxiliary transmission fluid pump. The motor control modules and the hybrid/EV powertrain control module 1 are part of the power inverter module and are not serviced separately.
The motor control modules test for isolation between each high voltage bus and vehicle chassis whenever high voltage is present at the power inverter module.

OBDII Code P1B44 Chevrolet - Drive Motor 2 Control Module Hybrid/EV Battery Voltage Isolation Sensing Circuit 2 High Voltage - AutoCodes.com — P1B44 Chevrolet Code - Drive Motor 2 Control Module Hybrid/EV Battery Voltage Isolation Sensing Circuit 2 High Voltage

What does this mean?

What are the Possible Causes of the DTC P1B44 Chevrolet?

Faulty Hybrid/Electric Vehicle Battery Pack

How to Fix the DTC P1B44 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 P1B44 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 P1B44 Chevrolet Code

1. What does the OBDII code P1B44 mean for a Chevrolet?

P1B44 indicates an issue with the Drive Motor 2 Control Module, specifically related to the Hybrid/EV battery voltage isolation sensing circuit 2 detecting excessively high voltage.

2. What are the common symptoms of a P1B44 code in a Chevrolet?

Symptoms may include the check engine light turning on, reduced hybrid or EV performance, limited propulsion power, or a warning message on the dashboard.

3. What causes the P1B44 code to appear?

Common causes include faulty wiring or connectors in the voltage sensing circuit, a malfunctioning Drive Motor 2 Control Module, or an issue with the hybrid/EV battery itself.

4. Can I drive my Chevrolet with a P1B44 code?

It is not recommended to drive the vehicle with this code, as it may result in reduced performance or damage to the hybrid/EV system. Seek diagnosis and repair as soon as possible.

5. How is the P1B44 code diagnosed?

A technician will use a scan tool to confirm the code, inspect the wiring and connectors for damage, and test the hybrid/EV battery as well as the Drive Motor 2 Control Module.

6. Can a loose connector cause the P1B44 code?

Yes, a loose, corroded, or damaged connector in the voltage sensing circuit can cause this code to appear.

7. How do I fix the P1B44 code in my Chevrolet?

Repairs may include replacing damaged wiring or connectors, repairing the Drive Motor 2 Control Module, or addressing issues with the hybrid/EV battery.

8. Is the P1B44 code specific to Chevrolet EVs or hybrids?

Yes, this code is specific to Chevrolet vehicles with hybrid or EV systems, as it relates to the high-voltage battery and associated control modules.

9. What tools are needed to troubleshoot the P1B44 code?

A professional scan tool, a multimeter for testing voltage and continuity, and possibly specialized tools for high-voltage system diagnosis are required.

10. How much does it cost to repair a P1B44 code?

Repair costs can vary widely, depending on whether the issue is a simple wiring repair or a major component replacement, such as the Drive Motor 2 Control Module or hybrid battery.