AutoCodes – GMC – P1B0C GMC

P1B0C GMC Code - Drive Motor 1 Control Module Hybrid Battery Voltage Isolation Sensing Circuit 2 High 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: P1B0C GMC indicates Drive Motor 1 Control Module Hybrid Battery Voltage Isolation Sensing Circuit 2 High 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 775

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 P1B0C GMC 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 P1B0C GMC - Drive Motor 1 Control Module Hybrid Battery Voltage Isolation Sensing Circuit 2 High Voltage - AutoCodes.com — P1B0C GMC Code - Drive Motor 1 Control Module Hybrid Battery Voltage Isolation Sensing Circuit 2 High Voltage

What does this mean?

What are the Possible Causes of the DTC P1B0C GMC?

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 P1B0C GMC?

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 P1B0C GMC 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 P1B0C GMC code?

Need more information on how to fix the P1B0C GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1B0C GMC code diagnosed by a professional: Find a repair shop in your area

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 P1B0C GMC Code

1. What are common symptoms of OBDII code P1B0C in a GMC vehicle?

The common symptoms of code P1B0C may include the check engine light illuminating, reduced hybrid system performance, or issues with the high voltage battery.

2. What can cause the OBDII code P1B0C in a GMC?

The code P1B0C in GMC vehicles is typically caused by faults in the Drive Motor 1 Control Module Hybrid Battery Voltage Isolation Sensing Circuit 2, which can be due to wiring issues, sensor malfunctions, or module failures.

3. How is the OBDII code P1B0C diagnosed in a GMC?

Diagnosing code P1B0C usually involves using a professional OBDII scanner to retrieve the fault code, inspecting the Drive Motor 1 Control Module Hybrid Battery Voltage Isolation Sensing Circuit 2 components, and performing electrical tests to pinpoint the source of the issue.

4. Can I continue driving my GMC with the OBDII code P1B0C present?

It is not recommended to drive your GMC with the code P1B0C active, as it can lead to further damage to the hybrid system components and potentially compromise vehicle safety.

5. How can the OBDII code P1B0C in a GMC be repaired?

Repairing the P1B0C code typically involves addressing the underlying issue with the Drive Motor 1 Control Module Hybrid Battery Voltage Isolation Sensing Circuit 2, which may require repairing or replacing wiring, sensors, or the control module itself.

6. Are there any DIY tips for fixing the OBDII code P1B0C in a GMC?

DIY repairs for code P1B0C are not recommended due to the complexity of the hybrid system components involved. It is best to seek professional assistance to diagnose and repair this issue accurately.

7. Can a faulty hybrid battery cause the OBDII code P1B0C to trigger?

Yes, a faulty hybrid battery or issues related to high voltage isolation can contribute to triggering the code P1B0C in a GMC vehicle.

8. How long does it take to repair the OBDII code P1B0C in a GMC?

The repair time for the P1B0C code can vary depending on the specific cause of the issue and the availability of parts. It is advisable to consult a professional technician for a more accurate estimate.

9. Is the OBDII code P1B0C covered under any warranty for GMC vehicles?

Depending on the vehicle's age and warranty status, the repairs for the OBDII code P1B0C may be covered under the GMC warranty. It is recommended to check with the dealership or warranty provider for more information.

10. Can regular maintenance help prevent the OBDII code P1B0C in a GMC?

Regular maintenance, such as inspecting the hybrid system components, checking for loose connections, and monitoring the battery health, can help prevent issues that may lead to the activation of code P1B0C in a GMC vehicle.