AutoCodes – GMC – P1B03 GMC

P1B03 GMC Code - Drive Motor 1 Position Sensor Circuit 2 High Voltage

Quick Answer

The drive motor position sensor is monitored by the motor control module. Common causes include Faulty Drive Motor 1 Position Sensor, Drive Motor 1 Position Sensor harness is open or shorted, Drive Motor 1 Position Sensor 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: P1B03 GMC indicates Drive Motor 1 Position Sensor Circuit 2 High Voltage.
Common causes: Common causes include Faulty Drive Motor 1 Position Sensor, Drive Motor 1 Position Sensor harness is open or shorted, Drive Motor 1 Position Sensor 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 1,217

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 Aug 07, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1B03 GMC Description

The drive motor position sensor is monitored by the motor control module. The motor control module monitors the angular position, speed, and direction of the drive motor 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. At vehicle ON, the motor control module outputs a 7 V 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 return signals, often referred to as Sine and Cosine waveforms, abbreviated SIN and COS. 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 coil signals allows the motor control module to determine the exact position, speed, and direction of the drive motor rotor. The drive motor 1 position sensor is serviceable separately from the drive motor assembly. The Diagnostic Trouble Code (DTC) will be set when the motor control module is unable to track the motor position based upon the sensor signals.

OBDII Code P1B03 GMC - Drive Motor 1 Position Sensor Circuit 2 High Voltage - AutoCodes.com — P1B03 GMC Code - Drive Motor 1 Position Sensor Circuit 2 High Voltage

What does this mean?

What are the Possible Causes of the DTC P1B03 GMC?

Faulty Drive Motor 1 Position Sensor
Drive Motor 1 Position Sensor harness is open or shorted
Drive Motor 1 Position Sensor circuit poor electrical connection
Faulty Power Inverter Module

How to Fix the DTC P1B03 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 P1B03 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 P1B03 GMC code?

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Need Help with the Code?

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Information for Specific GMC Models

P1B03 2016 GMC Sierra — Drive Motor Position Sensor Circuit Tracking Lost
P1B03 2017 GMC Sierra — Drive Motor Position Sensor Circuit Tracking Lost
P1B03 2018 GMC Sierra — Drive Motor Position Sensor Circuit Tracking Lost

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 P1B03 GMC Code

1. What are the common symptoms of OBDII code P1B03 GMC (Drive Motor 1 Position Sensor Circuit 2 High Voltage)?

- Common symptoms include poor acceleration, reduced power output, and the illumination of the check engine light.

2. What are some possible causes of OBDII code P1B03 GMC?

- Possible causes may include a faulty drive motor position sensor, damaged wiring or connectors in the sensor circuit, or issues with the drive motor itself.

3. How can I diagnose the cause of OBDII code P1B03 GMC?

- Diagnosis typically involves using an OBDII scanner to retrieve the code, conducting a visual inspection of the sensor and its connections, and performing electrical tests to pinpoint the issue.

4. Is it safe to continue driving with OBDII code P1B03 GMC present?

- It is not recommended to continue driving with this code active, as it can affect the performance and safety of your vehicle. It is best to address the issue promptly.

5. Can I repair OBDII code P1B03 GMC on my own?

- Depending on your level of automotive expertise, you may be able to address this code on your own by checking and repairing the sensor circuit, but it is recommended to seek professional help for accurate diagnosis and repair.

6. Are there any specific repair tips for fixing OBDII code P1B03 GMC?

- When repairing this code, it is crucial to carefully inspect the wiring and connectors for any signs of damage or corrosion, and to follow proper diagnostic procedures to ensure an accurate repair.

7. How much does it typically cost to fix OBDII code P1B03 GMC at a repair shop?

- The cost of repairing this code at a repair shop can vary depending on the underlying issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

8. Can resetting the check engine light make OBDII code P1B03 GMC disappear?

- Resetting the check engine light may temporarily clear the code, but it will likely reappear if the underlying issue causing the code is not addressed and repaired.

9. Will OBDII code P1B03 GMC cause my vehicle to fail an emissions test?

- Yes, this code can potentially cause your vehicle to fail an emissions test, as it indicates a problem with the drive motor position sensor circuit that can affect emissions control.

10. How can I prevent OBDII code P1B03 GMC from recurring in the future?

- To prevent this code from recurring, it is important to address any underlying issues promptly, perform regular maintenance on your vehicle, and follow manufacturer's recommendations for service intervals.