AutoCodes – GMC – P1B04 GMC

P1B04 GMC 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 GMC 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 1,075

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

What does this mean?

What are the Possible Causes of the DTC P1B04 GMC?

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 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 P1B04 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 P1B04 GMC code?

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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 GMC Code

What does the OBDII code P1B04 mean for a GMC vehicle?

The OBDII code P1B04 indicates a "Drive Motor 2 Position Sensor Circuit Loss of Tracking," which means the vehicle's control module has detected an issue with the position sensor for the second drive motor.

What are the common symptoms associated with the P1B04 code?

Common symptoms include reduced power or performance of the vehicle, warning lights on the dashboard, unusual noises from the motor area, and potential issues with acceleration.

What might cause the P1B04 code to trigger?

The P1B04 code can be triggered by a faulty drive motor 2 position sensor, wiring issues such as shorts or open circuits, poor connections, or a malfunctioning control module.

How can I diagnose the P1B04 code?

To diagnose the P1B04 code, check the vehicle's OBDII system for other related codes, inspect the wiring and connectors for damage, and test the functionality of the drive motor 2 position sensor with a multimeter.

What repairs may be necessary for the P1B04 code?

Repairs may involve replacing the drive motor 2 position sensor, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the control module if it's found to be faulty.

Will driving with the P1B04 code cause further damage to my vehicle?

While it may not cause immediate damage, driving with the P1B04 code can lead to reduced vehicle performance and may worsen underlying issues, so it is recommended to address the code promptly.

Can I clear the P1B04 code, and will it come back?

You can clear the P1B04 code using an OBDII scanner, but if the underlying issue is not resolved, the code will likely return after a short period of driving.

Are there any specific tools needed to fix the P1B04 code?

To fix the P1B04 code, you may need an OBDII scanner for diagnostics, a multimeter for testing electrical components, and basic hand tools for replacing parts.

Is it safe to drive my GMC vehicle with the P1B04 code?

It is generally not recommended to drive with the P1B04 code due to potential performance issues and safety concerns, especially if the vehicle is exhibiting significant symptoms.