AutoCodes – Generic – P1B0B

P1B0B Code - Drive Motor 1 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 two motor control modules. Common causes include Faulty Drive Motor 1 Control Module Hybrid/EV Battery, Drive Motor 1 Control Module Hybrid/EV Battery harness is open or shorted, Drive Motor 1 Control Module Hybrid/EV Battery circuit poor electrical connection. 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: P1B0B indicates Drive Motor 1 Control Module Hybrid/EV Battery Voltage Isolation Sensing Circuit 2 Low Voltage.
Common causes: Common causes include Faulty Drive Motor 1 Control Module Hybrid/EV Battery, Drive Motor 1 Control Module Hybrid/EV Battery harness is open or shorted, Drive Motor 1 Control Module Hybrid/EV Battery circuit poor electrical connection.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 3,921

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 07, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1B0B Description

The power inverter module, often referred to as the drive motor generator power inverter module, contains two motor control modules. Each motor control module measures hybrid battery high voltage with several internal sensors. The motor control modules test for loss of isolation between either the high-voltage positive circuit or high-voltage negative circuit and vehicle chassis. The motor control modules test for isolation when the high-voltage contactor relays are closed. The hybrid powertrain control module 2 only tests the hybrid battery assembly for high-voltage loss of isolation when the high-voltage contactor relays are open.
Motor control module loss of isolation is detected through the use of two high-impedance resistors and voltage measuring circuitry. The two resistors are connected in series between the high- voltage positive and high-voltage negative circuits. The centre connection of the two resistors is also connected to vehicle chassis. The motor control module then measures the voltage drop across one of the resistors. Without a loss of isolation, the motor control module should measure about half of the high voltage potential. This is referred to as mid-pack voltage. The Mid-pack voltage value is then doubled by the software and displayed on a scan tool as Motor 1 Isolation Voltage or Motor 2 Isolation Voltage. When a loss of isolation is present, the motor isolation voltage display will indicate voltage that is more or less than actual hybrid battery high voltage. The motor control module monitors the loss of isolation voltage measuring circuitry for correct operation.

OBDII Code P1B0B - Drive Motor 1 Control Module Hybrid/EV Battery Voltage Isolation Sensing Circuit 2 Low Voltage - AutoCodes.com — P1B0B Code - Drive Motor 1 Control Module Hybrid/EV Battery Voltage Isolation Sensing Circuit 2 Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B0B?

Faulty Drive Motor 1 Control Module Hybrid/EV Battery
Drive Motor 1 Control Module Hybrid/EV Battery harness is open or shorted
Drive Motor 1 Control Module Hybrid/EV Battery circuit poor electrical connection

How to Fix the DTC P1B0B?

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 P1B0B 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 P1B0B code?

Need more information on how to fix the P1B0B code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1B0B code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1B0B Buick — Drive Motor 1 Control Module Hybrid/EV Battery Voltage Isolation Sensing Circuit 2 Low Voltage
P1B0B Cadillac — Drive Motor 1 Control Module Hybrid/EV Battery Voltage Isolation Sensing Circuit 2 Low Voltage
P1B0B Chevrolet — Drive Motor 1 Control Module Hybrid/EV Battery Voltage Isolation Sensing Circuit 2 Low Voltage
P1B0B GMC — Drive Motor 1 Control Module Hybrid/EV Battery Voltage Isolation Sensing Circuit 2 Low Voltage
P1B0B Saturn — Drive Motor 1 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 P1B0B Code

1. What are the common symptoms of OBDII code P1B0B?

The common symptoms of OBDII code P1B0B Drive Motor 1 Control Module Hybrid/EV Battery Voltage Isolation Sensing Circuit 2 Low Voltage may include poor hybrid/EV system performance, decreased fuel efficiency, and potential inability to start the vehicle.

2. What can cause the OBDII code P1B0B to trigger?

The OBDII code P1B0B can be triggered by issues such as a faulty drive motor control module, a malfunctioning hybrid/EV battery voltage isolation sensing circuit, low voltage in the circuit, or damaged wiring/connectors.

3. How can I diagnose the OBDII code P1B0B?

Diagnosing the OBDII code P1B0B usually involves using a diagnostic scanner to read the code and perform further testing on the drive motor control module, hybrid/EV battery voltage isolation sensing circuit, and related components to identify the root cause of the issue.

4. What are some repair tips for fixing OBDII code P1B0B?

Repair tips for addressing OBDII code P1B0B may include checking and repairing any damaged wiring or connectors, replacing the drive motor control module if necessary, and ensuring proper voltage levels in the hybrid/EV battery isolation circuit.

5. Can I continue driving with the OBDII code P1B0B present?

It is not recommended to continue driving with the OBDII code P1B0B active, as it can lead to further damage to the hybrid/EV system and potentially result in more severe issues. It is best to address the problem promptly.

6. How serious is the OBDII code P1B0B?

The OBDII code P1B0B Drive Motor 1 Control Module Hybrid/EV Battery Voltage Isolation Sensing Circuit 2 Low Voltage should be taken seriously as it can affect the performance and reliability of the hybrid/EV system. Ignoring this code may lead to more significant problems over time.

7. Can a DIY enthusiast repair OBDII code P1B0B at home?

While some basic troubleshooting and inspections can be done by a DIY enthusiast, repairing OBDII code P1B0B may require specialized tools and knowledge. It is recommended to consult with a professional mechanic for accurate diagnosis and repairs.

8. How much does it typically cost to fix OBDII code P1B0B?

The cost of fixing OBDII code P1B0B can vary depending on the root cause of the issue, parts needed for replacement, and labor costs. It is advisable to obtain quotes from different repair shops to determine the overall cost.

9. Is OBDII code P1B0B specific to certain vehicle makes and models?

OBDII code P1B0B Drive Motor 1 Control Module Hybrid/EV Battery Voltage Isolation Sensing Circuit 2 Low Voltage is specific to hybrid and electric vehicles equipped with drive motor control modules and hybrid/EV battery voltage isolation sensing circuits.

10. How can I prevent OBDII code P1B0B from occurring in the future?

Regular maintenance of the hybrid/EV system, including checking the drive motor control module, hybrid/EV battery isolation circuit, and related components, can help prevent OBDII code P1B0B from occurring in the future.