AutoCodes – Generic – P1B03

P1B03 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 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 11,327

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

What does this mean?

What are the Possible Causes of the DTC P1B03?

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?

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 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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Information for Specific Makes

P1B03 Buick — Drive Motor 1 Position Sensor Circuit 2 High Voltage
P1B03 Cadillac — Drive Motor 1 Position Sensor Circuit 2 High Voltage
P1B03 Chevrolet — Drive Motor 1 Position Sensor Circuit 2 High Voltage
P1B03 GMC — Drive Motor 1 Position Sensor Circuit 2 High Voltage
P1B03 Saturn — Drive Motor 1 Position Sensor Circuit 2 High Voltage

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 Code

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

- Common symptoms include loss of power, decreased fuel efficiency, and illuminated check engine light.

2. What causes OBDII code P1B03 Drive Motor 1 Position Sensor Circuit 2 High Voltage?

- This code is typically caused by a malfunction in the drive motor 1 position sensor circuit 2, leading to high voltage readings.

3. How serious is OBDII code P1B03 Drive Motor 1 Position Sensor Circuit 2 High Voltage?

- While the vehicle may still be driveable with this code, it is important to address it promptly to prevent further damage to the drive motor system.

4. Can driving with OBDII code P1B03 Drive Motor 1 Position Sensor Circuit 2 High Voltage damage the vehicle?

- Continuing to drive with this code may potentially cause damage to the drive motor components and lead to more extensive repairs.

5. How do I diagnose OBDII code P1B03 Drive Motor 1 Position Sensor Circuit 2 High Voltage?

- Diagnosis typically involves using a professional OBDII scanner to retrieve the specific code and conducting further testing on the drive motor position sensor circuit.

6. Is it possible to reset OBDII code P1B03 Drive Motor 1 Position Sensor Circuit 2 High Voltage without repairs?

- While clearing the code may temporarily turn off the check engine light, it is essential to address the underlying issue to prevent future problems.

7. Are there any DIY repair tips for fixing OBDII code P1B03 Drive Motor 1 Position Sensor Circuit 2 High Voltage?

- DIY repair is not recommended for this code, as it involves complex electrical components. It is best to seek assistance from a qualified mechanic.

8. How much does it typically cost to repair OBDII code P1B03 Drive Motor 1 Position Sensor Circuit 2 High Voltage?

- The cost of repairs can vary depending on the extent of the issue, but it may involve replacing the drive motor position sensor or related components.

9. Can a faulty drive motor position sensor cause other OBDII codes to appear?

- Yes, a malfunctioning position sensor can cause related codes to trigger, affecting the performance and efficiency of the drive motor system.

10. How long can I safely drive with OBDII code P1B03 Drive Motor 1 Position Sensor Circuit 2 High Voltage before getting it repaired?

- It is recommended to address this code as soon as possible to avoid potential damage to the drive motor and ensure the vehicle operates smoothly.

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