AutoCodes – Buick – P1B42 Buick

P1B42 Buick Code - Drive Motor 2 Control Module Hybrid/EV Battery Voltage Isolation Sensing Performance

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: P1B42 Buick indicates Drive Motor 2 Control Module Hybrid/EV Battery Voltage Isolation Sensing Performance.
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 770

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 P1B42 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 P1B42 Buick - Drive Motor 2 Control Module Hybrid/EV Battery Voltage Isolation Sensing Performance - AutoCodes.com — P1B42 Buick Code - Drive Motor 2 Control Module Hybrid/EV Battery Voltage Isolation Sensing Performance

What does this mean?

What are the Possible Causes of the DTC P1B42 Buick?

Faulty Hybrid/Electric Vehicle Battery Pack

How to Fix the DTC P1B42 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 P1B42 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 P1B42 Buick Code

1. What does the OBDII code P1B42 mean for a Buick?

P1B42 indicates an issue with the Drive Motor 2 Control Module related to the Hybrid/EV battery voltage isolation sensing performance, suggesting improper voltage isolation.

2. What are the symptoms of code P1B42 in a Buick?

Common symptoms include warning lights on the dashboard, reduced hybrid or EV performance, limited charging capability, and possible failure to start.

3. What causes the P1B42 code to appear in a Buick?

Causes can include damaged wiring, a faulty Drive Motor 2 Control Module, issues with the hybrid/EV battery pack, or contamination causing voltage leakage.

4. Can I continue driving my Buick with a P1B42 code?

It is not recommended to continue driving, as this code indicates a potential safety issue with the hybrid/EV battery system, which could lead to further damage or reduced performance.

5. How is the P1B42 code diagnosed?

A technician will use a scan tool to confirm the code, inspect wiring and connectors, test the hybrid/EV battery voltage isolation, and check the functionality of the Drive Motor 2 Control Module.

6. What repairs are needed to fix the P1B42 code?

Repairs may include replacing damaged wiring, cleaning or replacing the hybrid/EV battery, or replacing the Drive Motor 2 Control Module if it is faulty.

7. How much does it cost to fix a P1B42 code on a Buick?

Repair costs vary depending on the root cause but can range from $200 for wiring repairs to over $1,000 for module or battery replacement.

8. Can a weak hybrid/EV battery trigger the P1B42 code?

Yes, a weak or failing hybrid/EV battery can cause voltage isolation issues, potentially triggering the P1B42 code.

9. What tools are needed to troubleshoot the P1B42 code?

Necessary tools include an advanced OBDII scanner, a multimeter for voltage testing, and possibly manufacturer-specific diagnostic software for hybrid/EV systems.

10. Can the P1B42 code clear itself after repairs?

The code may clear after addressing the issue, but itâ€™s recommended to use a scan tool to clear the code manually and ensure the problem has been resolved.