AutoCodes – GMC – P1B03 2018 GMC Sierra

P1B03 2018 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 2018 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 132

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 2018 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 2018 GMC Sierra - Drive Motor Position Sensor Circuit Tracking Lost - AutoCodes.com — P1B03 2018 GMC Sierra Code - Drive Motor Position Sensor Circuit Tracking Lost

What does this mean?

What are the Possible Causes of the DTC P1B03 2018 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 2018 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 2018 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 2018 GMC Sierra code?

Need more information on how to fix the P1B03 2018 GMC Sierra code? Get Access to Factory Service Manuals

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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 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P1B03 in a 2018 GMC Sierra?

The common symptoms of OBDII code P1B03 in a 2018 GMC Sierra include loss of power, reduced fuel efficiency, and illuminated check engine light.

2. What does the OBDII code P1B03 indicate in a 2018 GMC Sierra?

OBDII code P1B03 in a 2018 GMC Sierra indicates that the Drive Motor Position Sensor Circuit Tracking has been lost, typically related to the electric drive system.

3. What are the possible causes of OBDII code P1B03 in a 2018 GMC Sierra?

Possible causes of OBDII code P1B03 in a 2018 GMC Sierra include a faulty drive motor position sensor, damaged wiring or connectors, or issues with the electric drive system components.

4. How can I diagnose the OBDII code P1B03 in my 2018 GMC Sierra?

To diagnose the OBDII code P1B03 in a 2018 GMC Sierra, you can use an OBDII scanner to retrieve the code, inspect the drive motor position sensor and its connections, and perform a thorough inspection of the electric drive system components.

5. How can I repair OBDII code P1B03 in a 2018 GMC Sierra?

Repairing OBDII code P1B03 in a 2018 GMC Sierra may involve replacing the faulty drive motor position sensor, repairing damaged wiring or connectors, or addressing any issues with the electric drive system components as needed.

6. Can I continue driving my 2018 GMC Sierra with OBDII code P1B03?

It is not recommended to continue driving your 2018 GMC Sierra with OBDII code P1B03, as it can lead to further damage to the electric drive system components and potentially affect the vehicle's performance and safety.

7. How much does it cost to fix OBDII code P1B03 in a 2018 GMC Sierra?

The cost to fix OBDII code P1B03 in a 2018 GMC Sierra can vary depending on the specific issue causing the code, the necessary repairs or replacements, and labor costs. It's recommended to consult a professional mechanic for an accurate estimate.

8. Is OBDII code P1B03 a common issue in 2018 GMC Sierra vehicles?

OBDII code P1B03 related to Drive Motor Position Sensor Circuit Tracking Lost is not as common as some other OBDII codes, but it can occur in 2018 GMC Sierra vehicles with electric drive systems.

9. Can a DIY enthusiast fix OBDII code P1B03 in a 2018 GMC Sierra?

While some DIY enthusiasts may have the skills to diagnose and repair OBDII code P1B03 in a 2018 GMC Sierra, it is recommended to consult a professional mechanic with experience in electric drive systems for accurate diagnosis and repair.

10. How often should I have the electric drive system inspected in my 2018 GMC Sierra to prevent OBDII code P1B03?

It is recommended to have the electric drive system inspected during routine maintenance checks on your 2018 GMC Sierra to catch any potential issues early and prevent the occurrence of OBDII code P1B03 related to Drive Motor Position Sensor Circuit Tracking Lost.