AutoCodes – Buick – P1B43 Buick

P1B43 Buick 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 Buick 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 1,084

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

Faulty Hybrid/Electric Vehicle Battery Pack

How to Fix the DTC P1B43 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 P1B43 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 P1B43 Buick Code

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

The P1B43 code indicates an issue with the Drive Motor 2 Control Module's Hybrid/EV battery voltage isolation sensing circuit, specifically that Circuit 2 is detecting low voltage.

2. What are the common symptoms of code P1B43 in a Buick?

Symptoms may include an illuminated check engine light, reduced hybrid/EV performance, limited power mode activation, or difficulty in vehicle operation.

3. What causes the P1B43 code to appear in a Buick?

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

4. Can a loose connection cause the P1B43 code in a Buick?

Yes, loose or corroded connections in the hybrid/EV battery voltage sensing circuit can trigger the P1B43 code.

5. How do you diagnose the P1B43 code in a Buick?

Diagnosis involves using a scan tool to verify the code, inspecting wiring and connectors in Circuit 2, and testing the Drive Motor 2 Control Module and hybrid/EV battery isolation system.

6. Is it safe to drive a Buick with the P1B43 code?

It is not recommended to drive with this code, as it can lead to reduced performance or potential damage to the hybrid/EV system.

7. How is the P1B43 code fixed in a Buick?

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

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

While a low charge itself may not trigger the code, issues with the battery's isolation or sensing circuits can result in a P1B43 fault.

9. How much does it cost to fix the P1B43 code in a Buick?

Repair costs can vary widely, typically ranging from $200 to $1,500 depending on whether wiring, connectors, the control module, or other components need replacement.

10. Can I reset the P1B43 code without repairs?

Clearing the code without addressing the underlying issue may temporarily remove the warning, but the problem will likely return and could cause further damage.