AutoCodes – Generic – P1B04

P1B04 Code - Drive Motor 2 Position Sensor Circuit Loss of Tracking

Quick Answer

The drive motor generator position sensor is monitored by the motor control module. Common causes include Faulty Drive Motor Generator, Drive Motor Generator harness is open or shorted, Drive Motor Generator 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: P1B04 indicates Drive Motor 2 Position Sensor Circuit Loss of Tracking.
Common causes: Common causes include Faulty Drive Motor Generator, Drive Motor Generator harness is open or shorted, Drive Motor Generator 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 2,987

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 P1B04 Description

The drive motor generator position sensor is monitored by the motor control module. The motor control module monitors the angular position, speed and direction of the drive motor generator rotor based upon the signals of the resolver-type position sensor. The position sensor contains a drive coil, two driven coils and an irregular shaped metallic rotor. The metallic rotor is mechanically attached to the shaft of the drive motor generator. At vehicle ON, the motor control module outputs a 7 volt ac, 10 kHz excitation signal to the drive coil. The drive coil excitation signal creates a magnetic field surrounding the two driven coils and the irregular shaped rotor. The motor control module then monitors the two driven coil circuits for a return signal. The position of the irregular metallic rotor causes the magnetically-induced return signals of the driven coils to vary in size and shape. A comparison of the two driven coils signals allows the motor control module to determine the exact position, speed and direction of the drive motor generator rotor. The position sensor is a non-serviceable part of the drive motor generator.

OBDII Code P1B04 - Drive Motor 2 Position Sensor Circuit Loss of Tracking - AutoCodes.com — P1B04 Code - Drive Motor 2 Position Sensor Circuit Loss of Tracking

What does this mean?

What are the Possible Causes of the DTC P1B04?

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

How to Fix the DTC P1B04?

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 P1B04 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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Need Help with the Code?

Get the P1B04 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1B04 Buick — Drive Motor 2 Position Sensor Circuit Loss of Tracking
P1B04 Cadillac — Drive Motor 2 Position Sensor Circuit Loss of Tracking
P1B04 Chevrolet — Drive Motor 2 Position Sensor Circuit Loss of Tracking
P1B04 GMC — Drive Motor 2 Position Sensor Circuit Loss of Tracking
P1B04 Saturn — Drive Motor 2 Position Sensor Circuit Loss of Tracking

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 P1B04 Code

1. What are the common symptoms of OBDII code P1B04 Drive Motor 2 Position Sensor Circuit Loss of Tracking?

- Common symptoms include check engine light illumination, reduced hybrid system performance, and potential drivability issues.

2. What causes the OBDII code P1B04 Drive Motor 2 Position Sensor Circuit Loss of Tracking?

- The code is usually triggered by a faulty drive motor 2 position sensor, damaged wiring or connectors, or issues with the hybrid powertrain system.

3. How can I diagnose the cause of OBDII code P1B04 Drive Motor 2 Position Sensor Circuit Loss of Tracking?

- Diagnosis typically involves using a scan tool to retrieve the code, inspecting the drive motor 2 position sensor and related components, and testing the wiring for continuity and proper voltage.

4. Can I still drive my vehicle with the OBDII code P1B04 Drive Motor 2 Position Sensor Circuit Loss of Tracking?

- It is not recommended to drive the vehicle with this code present, as it can lead to further damage and potential safety hazards.

5. How do I repair OBDII code P1B04 Drive Motor 2 Position Sensor Circuit Loss of Tracking?

- Repair involves replacing the faulty drive motor 2 position sensor, repairing or replacing damaged wiring, and clearing the trouble code with a scan tool.

6. Are there any tips to prevent the recurrence of OBDII code P1B04 Drive Motor 2 Position Sensor Circuit Loss of Tracking?

- Regular maintenance of the hybrid powertrain system, checking for loose or damaged wiring, and addressing any issues with drive motor components promptly can help prevent the code from reoccurring.

7. Can a DIY enthusiast fix OBDII code P1B04 Drive Motor 2 Position Sensor Circuit Loss of Tracking?

- While some DIY enthusiasts may have the skills to diagnose and replace the drive motor 2 position sensor, it is recommended to seek professional help for proper diagnosis and repair.

8. Is OBDII code P1B04 Drive Motor 2 Position Sensor Circuit Loss of Tracking specific to certain vehicle makes and models?

- This code is specific to hybrid vehicles with drive motor systems, and the make and model may vary depending on the vehicle manufacturer.

9. Will clearing the OBDII code P1B04 Drive Motor 2 Position Sensor Circuit Loss of Tracking resolve the issue?

- Clearing the code will only reset the check engine light temporarily; the underlying issue causing the code will still need to be diagnosed and repaired to resolve the problem.

10. How critical is it to address OBDII code P1B04 Drive Motor 2 Position Sensor Circuit Loss of Tracking promptly?

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