AutoCodes – Ford – P0503 1998 Ford F150

P0503 1998 Ford F150 Code - Vehicle Speed Sensor Intermittent

Quick Answer

The vehicle speed sensor outputs a 4 pulse signal for every revolution of the rotor shaft, which is rotated by the transmission output shaft via the driven gear. 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 1998 Ford F150 indicates Vehicle Speed Sensor 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 3,506

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
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0503 1998 Ford F150 Description

The vehicle speed sensor outputs a 4 pulse signal for every revolution of the rotor shaft, which is rotated by the transmission output shaft via the driven gear. After this signal is converted into a more precise rectangular waveform by the waveform shaping circuit inside the combination meter, it is then transmitted to the Engine Control Module (ECM). The ECM determines the vehicle speed based on the frequency of these pulse signals.

OBDII Code P0503 1998 Ford F150 - Vehicle Speed Sensor Intermittent - AutoCodes.com — P0503 1998 Ford F150 Code - Vehicle Speed Sensor Intermittent

What does this mean?

What are the Possible Causes of the DTC P0503 1998 Ford F150?

Faulty Vehicle Speed Sensor
Vehicle speed sensor harness or connectors is open or shorted
Vehicle speed sensor circuit poor electrical connection
Damaged VSS or driven gears
After market add-on
Faulty Engine Control Module (ECM)

How to Fix the DTC P0503 1998 Ford F150?

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 does this mean?

Code Tech Notes

Indicates poor or noisy VSS performance. Vehicle speed data is received from either the vehicle speed sensor (VSS), transfer case speed sensor (TCSS) or anti-lock brake system (ABS) control module.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0503 1998 Ford F150 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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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 1998 Ford F150 Code

1. What are the common symptoms of OBDII code P0503 on a 1998 Ford F150?

- Common symptoms include erratic speedometer readings, cruise control issues, harsh shifting, and the Check Engine light illuminated.

2. What is the likely cause of OBDII code P0503 on a 1998 Ford F150?

- The most common cause is a faulty vehicle speed sensor (VSS) or a connection issue related to the VSS.

3. How do I diagnose the Vehicle Speed Sensor (VSS) on a 1998 Ford F150?

- Diagnosis involves checking the VSS wiring harness for damage, testing the VSS with a multimeter, and verifying proper VSS signal output.

4. Can a dirty or faulty wheel speed sensor trigger code P0503 on a 1998 Ford F150?

- Yes, a malfunctioning wheel speed sensor can sometimes trigger code P0503 due to its impact on the vehicle's speed monitoring system.

5. Is it safe to drive with OBDII code P0503 present on a 1998 Ford F150?

- While the vehicle may still be operable, it is recommended to address the issue promptly to prevent potential transmission problems or inaccurate speed readings.

6. What are some tips for repairing OBDII code P0503 on a 1998 Ford F150?

- Start by inspecting the VSS and its wiring for any visible damage or corrosion. If necessary, replace the VSS and ensure a secure connection.

7. Can a bad fuse or relay cause OBDII code P0503 on a 1998 Ford F150?

- While less common, a blown fuse or faulty relay related to the VSS circuit can indeed lead to the triggering of code P0503.

8. How much does it typically cost to repair OBDII code P0503 on a 1998 Ford F150?

- The cost can vary depending on the specific issue, but replacing a faulty VSS on a 1998 Ford F150 can range from $100 to $200 including parts and labor.

9. Will resetting the vehicle's computer clear OBDII code P0503 on a 1998 Ford F150?

- Resetting the computer may temporarily clear the code, but if the underlying issue, such as a faulty VSS, is not addressed, the code is likely to reappear.

10. How can I prevent OBDII code P0503 from recurring on my 1998 Ford F150?

- Regular maintenance and inspection of the VSS and related components can help prevent the recurrence of code P0503.