AutoCodes – Generic – P1B0C

P1B0C 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 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.

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Code Popularity 3,572

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

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?

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 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 code?

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Information for Specific Makes

P1B0C Buick — Drive Motor 1 Control Module Hybrid Battery Voltage Isolation Sensing Circuit 2 High Voltage
P1B0C Cadillac — Drive Motor 1 Control Module Hybrid Battery Voltage Isolation Sensing Circuit 2 High Voltage
P1B0C Chevrolet — Drive Motor 1 Control Module Hybrid Battery Voltage Isolation Sensing Circuit 2 High Voltage
P1B0C GMC — Drive Motor 1 Control Module Hybrid Battery Voltage Isolation Sensing Circuit 2 High Voltage
P1B0C Saturn — Drive Motor 1 Control Module Hybrid Battery Voltage Isolation Sensing Circuit 2 High 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 P1B0C Code

1. What does the OBDII code P1B0C mean?

Code P1B0C refers to an issue with the Drive Motor 1 Control Module, specifically the Hybrid Battery Voltage Isolation Sensing Circuit 2 detecting high voltage.

2. What are the common symptoms of the P1B0C code?

Symptoms may include a check engine light, reduced hybrid system performance, limited acceleration, or the vehicle entering a failsafe or "limp" mode.

3. What causes the P1B0C code?

Possible causes include faulty wiring or connectors in the hybrid battery voltage isolation circuit, a malfunctioning Drive Motor Control Module, or issues with the hybrid battery itself.

4. Can I drive my vehicle with the P1B0C code active?

Driving with this code is not recommended, as it may lead to reduced performance or further damage to the hybrid system.

5. How is the P1B0C code diagnosed?

Technicians typically use a scan tool to confirm the code, inspect the hybrid battery isolation sensing circuit and its wiring, and test the Drive Motor Control Module for faults.

6. Can the P1B0C code be caused by a low or degraded hybrid battery?

Yes, a degraded or failing hybrid battery can cause isolation issues that trigger this code.

7. What repairs are required to fix the P1B0C code?

Repairs may include replacing faulty wiring or connectors, repairing or replacing the Drive Motor Control Module, or addressing issues with the hybrid battery.

8. How much does it cost to repair the P1B0C code?

The repair cost can vary depending on the exact cause, ranging from $100 for minor wiring repairs to over $1,000 for a module or hybrid battery replacement.

9. Can I clear the P1B0C code without fixing the issue?

Clearing the code without addressing the underlying problem is not recommended, as it will likely return and could cause further damage.

10. Is the P1B0C code specific to certain car models?

This code is typically found in hybrid or plug-in hybrid vehicles, but the exact diagnosis and repair procedures may vary by manufacturer. Always refer to your vehicle's service manual.