AutoCodes – Buick – P1B44 Buick

P1B44 Buick 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 Buick 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 1,010

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

Faulty Hybrid/Electric Vehicle Battery Pack

How to Fix the DTC P1B44 Buick?

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 Buick 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 Buick Code

1. What does the OBDII code P1B44 mean on a Buick?

P1B44 indicates an issue with the Drive Motor 2 Control Module detecting a high voltage condition in the Hybrid/EV battery isolation sensing circuit 2.

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

Symptoms may include an illuminated check engine light, reduced power, limited EV functionality, or the vehicle entering limp mode.

3. What causes the P1B44 code to appear?

Common causes include damaged wiring or connectors, a faulty Drive Motor 2 Control Module, or issues with the hybrid/EV battery isolation sensing circuit.

4. Can a bad hybrid/EV battery cause the P1B44 code?

Yes, a malfunctioning or degraded hybrid/EV battery can contribute to voltage isolation issues, triggering the P1B44 code.

5. How is the P1B44 code diagnosed?

A mechanic will use a scan tool to read the code, inspect the wiring and connectors for damage, and test the components of the isolation sensing circuit and Drive Motor 2 Control Module.

6. Can I drive my Buick with the P1B44 code?

It is not recommended to drive the vehicle with this code, as it may result in reduced performance or further damage to the hybrid/EV system.

7. How do I fix the P1B44 code on my Buick?

Repairs may involve replacing damaged wiring, repairing faulty connectors, or replacing the Drive Motor 2 Control Module or hybrid/EV battery as necessary.

8. How much does it cost to fix the P1B44 code?

Repair costs vary but may range from $100 to $1,000 or more, depending on whether the issue is wiring-related or requires replacing major components like the hybrid/EV battery.

9. Can a software update fix the P1B44 code?

In some cases, a software update for the Drive Motor 2 Control Module may resolve the issue if itâ€™s caused by a programming error.

10. What preventative measures can help avoid the P1B44 code?

Regular maintenance, inspecting hybrid/EV system components, and addressing minor electrical issues promptly can help prevent this code from appearing.