AutoCodes – Generic – P1B05

P1B05 Code - Drive Motor 1 Control Module High Voltage System Interlock Circuit

Quick Answer

The high voltage interlock circuit is utilized to verify high voltage component integrity. Common causes include Faulty Drive Motor Generator Power Inverter Module, Drive Motor Generator Power Inverter Module harness is open or shorted, Drive Motor Generator Power Inverter Module 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: P1B05 indicates Drive Motor 1 Control Module High Voltage System Interlock Circuit.
Common causes: Common causes include Faulty Drive Motor Generator Power Inverter Module, Drive Motor Generator Power Inverter Module harness is open or shorted, Drive Motor Generator Power Inverter Module 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 6,944

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 01, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1B05 Description

The high voltage interlock circuit is utilized to verify high voltage component integrity. High voltage interlock circuit is a circuit loop that passes through certain high voltage components. High voltage interlock circuit is used to determine if access to high voltage components is being attempted. The opening of these high voltage components causes the high voltage interlock circuit to open. The battery energy control module sources about 12 mA of current on the 5V high voltage interlock circuit loop. The battery energy control module monitors both the high voltage interlock source current circuit and the high voltage interlock return current circuit in order to detect circuit faults. Both motor control modules monitor the circuit for current in order to detect an open condition. When the battery energy control module and/or the motor control modules sense conditions such as a loss of high voltage interlock circuit current, the high voltage contactor relays are commanded open by the hybrid powertrain control module.

OBDII Code P1B05 - Drive Motor 1 Control Module High Voltage System Interlock Circuit - AutoCodes.com — P1B05 Code - Drive Motor 1 Control Module High Voltage System Interlock Circuit

What does this mean?

What are the Possible Causes of the DTC P1B05?

Faulty Drive Motor Generator Power Inverter Module
Drive Motor Generator Power Inverter Module harness is open or shorted
Drive Motor Generator Power Inverter Module circuit poor electrical connection

How to Fix the DTC P1B05?

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 P1B05 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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Information for Specific Makes

P1B05 Buick — Drive Motor 1 Control Module High Voltage System Interlock Circuit
P1B05 Cadillac — Drive Motor 1 Control Module High Voltage System Interlock Circuit
P1B05 Chevrolet — Drive Motor 1 Control Module High Voltage System Interlock Circuit
P1B05 GMC — Drive Motor 1 Control Module High Voltage System Interlock Circuit
P1B05 Saturn — Drive Motor 1 Control Module High Voltage System Interlock Circuit

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 P1B05 Code

What does the OBDII code P1B05 mean?

The code P1B05 indicates an issue with the Drive Motor 1 Control Module High Voltage System Interlock Circuit, which is part of the hybrid or electric vehicle's high-voltage safety system.

What are the symptoms of code P1B05?

Common symptoms include a check engine light, reduced vehicle performance, inability to start the vehicle, or warnings related to the high-voltage system.

What causes the P1B05 code?

Causes may include a damaged or disconnected high-voltage interlock circuit, faulty wiring or connectors, a defective Drive Motor Control Module, or corrosion in the circuit components.

Can I drive my vehicle with the P1B05 code?

It is not recommended to drive with this code, as it may indicate a serious issue with the high-voltage safety system, which could compromise vehicle performance or safety.

How do you diagnose the P1B05 code?

Diagnosis typically involves inspecting the high-voltage interlock circuit for damage or loose connections, testing the wiring and connectors, and checking the functionality of the Drive Motor Control Module.

What tools are needed to troubleshoot the P1B05 code?

You will need an OBDII scanner, a multimeter for testing electrical connections, and possibly high-voltage-rated tools specific to hybrid or electric vehicles.

How is the P1B05 code fixed?

Repairs may include reconnecting or replacing damaged wiring, cleaning corroded connectors, or replacing the Drive Motor Control Module if it is defective.

Can the P1B05 code be triggered accidentally?

Yes, the code may be triggered if the high-voltage interlock circuit is disconnected during maintenance or incorrectly reconnected.

How much does it cost to repair code P1B05?

Repair costs vary depending on the specific issue, but can range from $100 for simple wiring repairs to over $1,000 if the Drive Motor Control Module needs replacement.

Is the P1B05 code specific to certain car brands?

This code is commonly found in hybrid and electric vehicles across various manufacturers, but its exact implementation may differ depending on the make and model.