AutoCodes – Cadillac – P1B42 Cadillac

P1B42 Cadillac 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 Cadillac 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 782

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

Faulty Hybrid/Electric Vehicle Battery Pack

How to Fix the DTC P1B42 Cadillac?

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 Cadillac 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 Cadillac Code

1. What does the OBDII code P1B42 mean on a Cadillac?

The P1B42 code indicates an issue with the isolation sensing performance of the hybrid/EV battery voltage in Drive Motor 2's control module.

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

Symptoms may include an illuminated check engine light, reduced fuel efficiency, limited electric drive performance, or the vehicle entering limp mode.

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

Common causes include a faulty Drive Motor 2 Control Module, damaged wiring or connectors, a malfunctioning hybrid/EV battery isolation sensor, or corrosion in the electrical system.

4. Can you drive a Cadillac with a P1B42 code?

While it may be possible to drive, itâ€™s not recommended. The vehicle could experience reduced performance, and ignoring the issue may lead to further damage to the hybrid/EV system.

5. How is the P1B42 code diagnosed in a Cadillac?

A technician will use a scan tool to read the code, inspect the wiring and connectors for damage or corrosion, and test the hybrid/EV battery isolation sensor and Drive Motor 2 Control Module for faults.

6. What repairs are needed to fix a P1B42 code in a Cadillac?

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

7. How much does it cost to repair a P1B42 code on a Cadillac?

Costs can vary widely depending on the exact issue, but replacing a Drive Motor Control Module or repairing wiring can range from $300 to $1,500 or more, including parts and labor.

8. Can a dead hybrid/EV battery trigger the P1B42 code in a Cadillac?

A degraded or malfunctioning hybrid/EV battery could potentially contribute to this code, especially if it impacts the voltage isolation sensing.

9. What tools are needed to diagnose and fix a P1B42 code?

A diagnostic scan tool, multimeter, and possibly specialized tools for testing hybrid/EV systems are typically required to diagnose and repair this issue.

10. Is the P1B42 code specific to Cadillacs?

No, while the code may appear on other hybrid or EV vehicles, its specific meaning and repair procedures depend on the make and model of the vehicle.