AutoCodes – Chevrolet – P0503 Chevrolet

P0503 Chevrolet Code - Vehicle Speed Sensor Circuit Intermittent

Quick Answer

The Vehicle Speed Sensor (VSS) assembly provides vehicle speed information to the Powertrain Control Module (PCM). Common causes include Faulty Vehicle Speed Sensor, Vehicle speed sensor harness or connectors is open or shorted, Vehicle speed 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: P0503 Chevrolet indicates Vehicle Speed Sensor Circuit Intermittent.
Common causes: Common causes include Faulty Vehicle Speed Sensor, Vehicle speed sensor harness or connectors is open or shorted, Vehicle speed 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 16,971

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0503 Chevrolet Description

The Vehicle Speed Sensor (VSS) assembly provides vehicle speed information to the Powertrain Control Module (PCM). The VSS assembly is a Permanent Magnet (PM) generator. The PM generator produces a pulsing AC voltage as rotor teeth on the transmission output shaft pass through the sensor's magnetic field. The AC voltage level and the number of pulses increase as the speed of the vehicle increases. The PCM converts the pulsing voltage to vehicle speed. The PCM uses the vehicle speed signal to determine shift timing and torque converter clutch (TCC) scheduling.

OBDII Code P0503 Chevrolet - Vehicle Speed Sensor Circuit Intermittent - AutoCodes.com — P0503 Chevrolet Code - Vehicle Speed Sensor Circuit Intermittent

What does this mean?

What are the Possible Causes of the DTC P0503 Chevrolet?

Faulty Vehicle Speed Sensor
Vehicle speed sensor harness or connectors is open or shorted
Vehicle speed sensor circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P0503 Chevrolet?

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 P0503 Chevrolet 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 P0503 Chevrolet code?

Need more information on how to fix the P0503 Chevrolet code? Get Access to Factory Service Manuals

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Get the P0503 Chevrolet 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 P0503 Chevrolet Code

1. What are the common symptoms of OBDII code P0503 in a Chevrolet vehicle?

- Common symptoms include erratic speedometer readings, incorrect or fluctuating speedometer readings, and issues with the cruise control system.

2. What can cause the OBDII code P0503 to trigger in a Chevrolet vehicle?

- The code P0503 is typically triggered by a faulty vehicle speed sensor, damaged wiring or connectors in the speed sensor circuit, or issues with the speedometer itself.

3. How does the vehicle speed sensor contribute to the operation of a Chevrolet vehicle?

- The vehicle speed sensor provides crucial data to the vehicle's computer system, helping to regulate various functions such as speedometer readings, cruise control operation, and transmission shifting.

4. How can I diagnose the cause of OBDII code P0503 in my Chevrolet vehicle?

- To diagnose the issue, you can use a scan tool to retrieve the trouble code, visually inspect the speed sensor and its wiring for any damage, and perform tests to check the sensor's functionality.

5. What are some repair tips for addressing OBDII code P0503 in a Chevrolet vehicle?

- Repair tips may include replacing the faulty vehicle speed sensor, repairing or replacing damaged wiring or connectors, and ensuring proper alignment and installation of the speed sensor.

6. Can driving with OBDII code P0503 in a Chevrolet vehicle cause further damage?

- While driving with the code may not cause immediate harm to the vehicle, it is important to address the issue promptly to prevent potential safety hazards and further damage to other components.

7. Is it possible to reset OBDII code P0503 in a Chevrolet vehicle without fixing the underlying issue?

- Resetting the code without addressing the root cause will only temporarily clear the error code, and it is likely to reappear once the issue persists.

8. Can a DIY enthusiast with basic mechanical skills fix OBDII code P0503 in a Chevrolet vehicle?

- Depending on the specific cause of the code, some DIY enthusiasts with basic mechanical skills may be able to address the issue by following repair guides and using the necessary tools.

9. How much does it typically cost to repair OBDII code P0503 in a Chevrolet vehicle?

- The cost of repairing OBDII code P0503 can vary depending on the cause of the issue, the need for parts replacement, and whether you choose to perform the repair yourself or seek professional assistance.

10. Are there any preventive measures to avoid encountering OBDII code P0503 in a Chevrolet vehicle?

- Regular maintenance, including checking the vehicle speed sensor and its wiring for damage during routine inspections, can help prevent issues that may trigger OBDII code P0503.