AutoCodes – Generic – P1B43

P1B43 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 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 2,397

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

Faulty Hybrid/Electric Vehicle Battery Pack

How to Fix the DTC P1B43?

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 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.

Need more information about the P1B43 code?

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Information for Specific Makes

P1B43 Buick — Drive Motor 2 Control Module Hybrid/EV Battery Voltage Isolation Sensing Circuit 2 Low Voltage
P1B43 Cadillac — Drive Motor 2 Control Module Hybrid/EV Battery Voltage Isolation Sensing Circuit 2 Low Voltage
P1B43 Chevrolet — Drive Motor 2 Control Module Hybrid/EV Battery Voltage Isolation Sensing Circuit 2 Low Voltage
P1B43 GMC — Drive Motor 2 Control Module Hybrid/EV Battery Voltage Isolation Sensing Circuit 2 Low Voltage
P1B43 Saturn — Drive Motor 2 Control Module Hybrid/EV Battery Voltage Isolation Sensing Circuit 2 Low Voltage

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 Code

What does the OBDII code P1B43 mean?

The OBDII code P1B43 indicates a low voltage condition in the Drive Motor 2 Control Module's hybrid or electric vehicle battery voltage isolation sensing circuit 2.

What symptoms might trigger the P1B43 code?

Common symptoms include reduced vehicle performance, warning lights on the dashboard, and in some cases, the vehicle may enter limp mode or shut down entirely.

What can cause the P1B43 code to appear?

Causes may include faulty wiring or connectors, a malfunctioning Drive Motor 2 Control Module, issues with the hybrid battery, or problems in the isolation sensing circuit.

How can I diagnose the P1B43 code?

Start by inspecting the wiring and connectors associated with the Drive Motor 2 Control Module for damage or corrosion. Use a multimeter to check for proper voltage levels in the isolation sensing circuit.

What repairs are typically needed for the P1B43 code?

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

Is it safe to drive a vehicle with the P1B43 code?

It is generally not safe to drive a vehicle with this code, as it may lead to a loss of power or control. It is recommended to diagnose and repair the issue promptly.

Can I clear the P1B43 code after repairs?

Yes, after addressing the underlying issue, you can clear the P1B43 code using an OBDII scanner, but make sure the repairs are properly completed first.

Will the P1B43 code cause my vehicle to fail emissions testing?

Yes, if the check engine light is on due to the P1B43 code, it may cause your vehicle to fail emissions testing.

How much does it typically cost to repair the P1B43 code?

Repair costs can vary widely depending on the specific issue, but it may range from $100 for wiring repairs to over $1000 for module replacement or extensive repairs.