AutoCodes – Cadillac – P1B43 Cadillac

P1B43 Cadillac Code - Drive Motor 2 Control Module Hybrid/EV Battery Voltage Isolation Sensing Circuit 2 Low 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: P1B43 Cadillac indicates Drive Motor 2 Control Module Hybrid/EV Battery Voltage Isolation Sensing Circuit 2 Low 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 827

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 P1B43 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 P1B43 Cadillac - Drive Motor 2 Control Module Hybrid/EV Battery Voltage Isolation Sensing Circuit 2 Low Voltage - AutoCodes.com — P1B43 Cadillac Code - Drive Motor 2 Control Module Hybrid/EV Battery Voltage Isolation Sensing Circuit 2 Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B43 Cadillac?

Faulty Hybrid/Electric Vehicle Battery Pack

How to Fix the DTC P1B43 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 P1B43 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 P1B43 Cadillac Code

1. What does the OBDII code P1B43 mean on a Cadillac?

P1B43 indicates a problem with the Drive Motor 2 Control Module's ability to sense the voltage isolation circuit for the hybrid/EV battery, specifically reporting a low voltage condition.

2. What are the common symptoms of the P1B43 code?

Symptoms may include the vehicle entering limp mode, reduced performance, hybrid/EV system warnings on the dashboard, or a failure to switch between electric and gasoline modes.

3. What causes the P1B43 code to appear?

Common causes include a faulty Drive Motor 2 Control Module, damaged wiring, poor connections in the sensing circuit, or a malfunction in the hybrid/EV battery's voltage isolation system.

4. Can I drive my Cadillac with the P1B43 code?

It is not recommended to drive with this code active as it may indicate issues with the hybrid/EV battery or electrical system. Continuing to drive could result in further damage or safety risks.

5. How is the P1B43 code diagnosed?

Diagnosis involves using a scan tool to confirm the code, inspecting the voltage isolation sensing circuit wiring and connectors, and testing the Drive Motor 2 Control Module and hybrid/EV battery system for faults.

6. What repairs are typically needed to fix the P1B43 code?

Repairs may include replacing damaged wiring, fixing poor connections, replacing the Drive Motor 2 Control Module, or addressing faults in the hybrid/EV battery system.

7. How much does it cost to fix the P1B43 code?

Repair costs vary depending on the specific issue, but fixing wiring or connections is generally less expensive than replacing the Drive Motor 2 Control Module or hybrid battery components.

8. Can a low hybrid/EV battery cause the P1B43 code?

While a depleted battery alone is not the direct cause, issues with the battery's voltage isolation sensing circuit could lead to this code being triggered.

9. Is the P1B43 code specific to Cadillac vehicles?

The P1B43 code is manufacturer-specific and commonly associated with Cadillac hybrid or electric vehicles, although similar codes may appear in other GM vehicles.

10. Can a software update resolve the P1B43 code?

In some cases, a software update for the Drive Motor 2 Control Module may address the issue, but this depends on the specific circumstances and should be determined by a qualified technician.