AutoCodes – Saturn – P1B43 Saturn

P1B43 Saturn 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 Saturn 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 1,021

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

Faulty Hybrid/Electric Vehicle Battery Pack

How to Fix the DTC P1B43 Saturn?

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 Saturn 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 Saturn Code

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

P1B43 indicates an issue with the Drive Motor 2 Control Module's ability to sense the hybrid/EV battery voltage isolation in Circuit 2, specifically detecting a low voltage condition.

2. What are the common symptoms of code P1B43 on a Saturn?

Symptoms may include the illumination of the check engine light, reduced hybrid or EV performance, limited driving modes, and potential charging system issues.

3. What causes the P1B43 code on a Saturn?

Possible causes include a faulty Drive Motor 2 Control Module, damaged or corroded wiring, a malfunctioning hybrid/EV battery pack, or a compromised voltage sensing circuit.

4. Can a low hybrid battery state trigger the P1B43 code?

A low hybrid battery state alone is unlikely to trigger this code, but issues within the battery's voltage isolation system could contribute to the problem.

5. How is the P1B43 code diagnosed?

Technicians will inspect the wiring and connectors, test the voltage isolation sensing circuit, and evaluate the Drive Motor 2 Control Module and hybrid/EV battery for faults.

6. Is it safe to drive with a P1B43 code on a Saturn?

Driving with this code may not be safe, as it can affect hybrid/EV performance and potentially lead to further damage if the issue is not addressed.

7. What repairs can fix the P1B43 code?

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

8. Can a software update resolve code P1B43?

In some cases, a software update for the Drive Motor 2 Control Module may resolve the issue, but this depends on the specific circumstances and diagnostic findings.

9. How much does it cost to fix the P1B43 code on a Saturn?

The repair cost varies widely, ranging from $100 for minor wiring fixes to over $1,000 if the Drive Motor 2 Control Module or hybrid/EV battery needs replacement.

10. Can I diagnose the P1B43 code at home?

While you can use an OBDII scanner to read the code, diagnosing the specific cause often requires advanced tools and expertise to test the voltage isolation circuit and related components.