AutoCodes – Cadillac – P1B0C Cadillac

P1B0C Cadillac 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 Cadillac 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 932

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

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 Cadillac?

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 Cadillac 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 Cadillac code?

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

Need Help with the Code?

Get the P1B0C Cadillac 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 Cadillac Code

1. What are common symptoms of OBDII code P1B0C in a Cadillac related to the Drive Motor 1 Control Module Hybrid Battery Voltage Isolation Sensing Circuit 2 High Voltage?

- Common symptoms may include poor hybrid system performance, decreased fuel efficiency, and potential illumination of the check engine light.

2. What are possible causes of OBDII code P1B0C in a Cadillac?

- Possible causes may include issues with the drive motor 1 control module, hybrid battery voltage isolation sensing circuit 2, high voltage interlock loop (HVIL) circuit problems, or faulty wiring/connectors.

3. How can I diagnose OBDII code P1B0C in a Cadillac?

- Diagnosis typically involves using an OBDII scanner to retrieve the specific code, inspecting the drive motor control module, checking the hybrid battery voltage isolation sensing circuit, and testing the HVIL circuit for proper operation.

4. Are there any repair tips for addressing OBDII code P1B0C in a Cadillac?

- Repair tips may include checking and repairing any damaged wiring or connectors, ensuring proper connections in the high voltage system, and potentially replacing the drive motor 1 control module if deemed faulty.

5. Can OBDII code P1B0C in a Cadillac be fixed without professional help?

- While some basic troubleshooting steps can be taken, addressing OBDII code P1B0C often requires specialized knowledge and equipment, so seeking professional help from a qualified technician is recommended.

6. Is it safe to continue driving with OBDII code P1B0C present in a Cadillac?

- It is generally not recommended to continue driving with this code present, as it can indicate potential issues with the hybrid system that may affect vehicle performance and safety.

7. How urgent is it to address OBDII code P1B0C in a Cadillac?

- It is advisable to address this code promptly to prevent further damage to the hybrid system components and ensure the vehicle operates safely and efficiently.

8. Can resetting the OBDII code P1B0C in a Cadillac resolve the issue?

- Resetting the code may temporarily clear the check engine light, but it will not fix the underlying issue causing OBDII code P1B0C. It is essential to diagnose and repair the problem to prevent it from reoccurring.

9. Are there any recalls or technical service bulletins related to OBDII code P1B0C in Cadillac vehicles?

- It is recommended to check with a Cadillac dealership or online databases for any relevant recalls or technical service bulletins related to this specific OBDII code to see if there are known solutions or remedies provided by the manufacturer.

10. How can I prevent OBDII code P1B0C from appearing in my Cadillac in the future?

- Regular maintenance and inspections of the hybrid system components, ensuring proper wiring connections, and addressing any related issues promptly can help prevent OBDII code P1B0C from reoccurring in the future.