AutoCodes – Cadillac – P1B03 Cadillac

P1B03 Cadillac 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 Cadillac 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 936

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

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

What does this mean?

What are the Possible Causes of the DTC P1B03 Cadillac?

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 Cadillac?

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 Cadillac 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 Cadillac code?

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

Need Help with the Code?

Get the P1B03 Cadillac code diagnosed by a professional: Find a repair shop in your area

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 Cadillac Code

What does the OBDII code P1B03 mean for my Cadillac?

The P1B03 code indicates a high voltage condition in the Drive Motor 1 Position Sensor Circuit 2, which is related to the electric drive motor's position sensing.

What are the common symptoms of the P1B03 code?

Common symptoms include reduced engine performance, warning lights on the dashboard, and potential issues with hybrid system operation if applicable.

What could cause the P1B03 code to trigger?

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

How can I diagnose the P1B03 code?

Start by using an OBDII scanner to confirm the code. Then, visually inspect the wiring and connectors for damage, and check the position sensor and its operation.

Is it safe to drive my Cadillac with the P1B03 code?

While it may be safe for short distances, driving with this code can lead to reduced performance and potential damage to the vehicle's hybrid system, so itâ€™s best to have it checked promptly.

What repairs are typically needed for a P1B03 code?

Repairs may involve replacing the drive motor position sensor, repairing or replacing damaged wiring, or addressing issues with the hybrid control module.

Can I clear the P1B03 code without fixing the issue?

While you can clear the code with an OBDII scanner, it is not advisable to do so without fixing the underlying issue, as the code will likely return.

How much will it typically cost to fix a P1B03 code?

Repair costs can vary widely but may range from $100 to $1,000 depending on the specific repairs needed, such as sensor replacement or wiring repairs.

Are there any preventative measures to avoid the P1B03 code?

Regular maintenance, including inspections of the electrical systems, can help prevent issues. Ensuring that all components related to the hybrid system are in good condition is also beneficial.