AutoCodes – GMC – P1B03 2017 GMC Sierra

P1B03 2017 GMC Sierra Code - Drive Motor Position Sensor Circuit Tracking Lost

Quick Answer

The generator control module also called the starter/generator control module, is comprised of the following three control modules: the hybrid/EV powertrain control module 1, 14 V power module, and the drive motor control module. Common causes include Faulty Starter/Generator, Starter/Generator harness is open or shorted, Starter/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: P1B03 2017 GMC Sierra indicates Drive Motor Position Sensor Circuit Tracking Lost.
Common causes: Common causes include Faulty Starter/Generator, Starter/Generator harness is open or shorted, Starter/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 143

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 2017 GMC Sierra Description

The generator control module also called the starter/generator control module, is comprised of the following three control modules: the hybrid/EV powertrain control module 1, 14 V power module, and the drive motor control module. These three control modules are nonserviceable and are part of the generator control module.
The generator control module monitors the angular position, speed, and direction of the starter generator rotor based upon the signals of the resolver-type motor 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 starter generator.
At ignition ON, an AC voltage, 10 kHz excitation signal is output to the drive coil. The drive coil excitation signal creates a magnetic field surrounding the two driven coils and the irregular-shaped rotor. The generator 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 generator control module to determine the exact position, speed, and direction of the starter generator rotor. The position sensor is a non-serviceable part of the starter generator.
The Diagnostic Trouble Code (DTC) will be set when the generator control module tracking error is greater than 5 degrees.

OBDII Code P1B03 2017 GMC Sierra - Drive Motor Position Sensor Circuit Tracking Lost - AutoCodes.com — P1B03 2017 GMC Sierra Code - Drive Motor Position Sensor Circuit Tracking Lost

What does this mean?

What are the Possible Causes of the DTC P1B03 2017 GMC Sierra?

Faulty Starter/Generator
Starter/Generator harness is open or shorted
Starter/Generator circuit poor electrical connection
Faulty Starter/Generator Control Module

How to Fix the DTC P1B03 2017 GMC Sierra?

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 2017 GMC Sierra 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 2017 GMC Sierra code?

Need more information on how to fix the P1B03 2017 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the 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 P1B03 2017 GMC Sierra Code

1. What are the common symptoms of OBDII code P1B03 in a 2017 GMC Sierra?

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

2. What does the OBDII code P1B03 indicate in a 2017 GMC Sierra?

- The code P1B03 indicates that the drive motor position sensor circuit tracking has been lost in the vehicle.

3. What are the possible causes of the drive motor position sensor circuit tracking lost in a 2017 GMC Sierra?

- Possible causes include a faulty drive motor position sensor, damaged wiring or connectors in the circuit, or a malfunction in the drive motor control module.

4. How can I diagnose the OBDII code P1B03 in my 2017 GMC Sierra?

- Diagnosis involves using a scan tool to retrieve the trouble codes, inspecting the drive motor position sensor and related wiring, and testing the drive motor control module.

5. Is it safe to continue driving my 2017 GMC Sierra with the code P1B03 present?

- It is not recommended to drive the vehicle with the code P1B03 as it can lead to further damage and potentially unsafe driving conditions.

6. Can I reset the OBDII code P1B03 in my 2017 GMC Sierra by disconnecting the battery?

- While disconnecting the battery may clear the code temporarily, it is important to diagnose and repair the underlying issue to prevent the code from reoccurring.

7. How much does it typically cost to repair the OBDII code P1B03 in a 2017 GMC Sierra?

- The cost of repair can vary depending on the exact cause of the issue, but it may involve replacing the drive motor position sensor, repairing wiring, or addressing control module problems.

8. Are there any DIY repair tips for addressing the drive motor position sensor circuit tracking lost in a 2017 GMC Sierra?

- DIY repair tips may include checking for loose connections, inspecting wiring for damage, and ensuring proper sensor alignment before considering sensor or module replacement.

9. Will the OBDII code P1B03 cause my 2017 GMC Sierra to fail an emissions test?

- The code P1B03 can cause your vehicle to fail an emissions test as it indicates a problem with the drive motor position sensor circuit, which is vital for emissions control.

10. How long does it typically take to repair the drive motor position sensor circuit tracking lost issue in a 2017 GMC Sierra?

- The repair time can vary depending on the exact cause of the problem and the availability of parts, but it may take a few hours to a full day for a professional technician to address the issue.