Engine-Codes - Ford - P0503 1999 FORD F150

P0503 1999 FORD F150 - Vehicle Speed Sensor Intermittent

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What is this?
Table of contents

P0503 1999 FORD F150 Possible Causes

  • 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 is the P0503 1999 FORD F150 code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

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 P0503 1999 FORD F150 code

Labor: 1.0

The cost to diagnose the P0503 1999 FORD F150 code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.
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When is the code detected?

The signal sent by the vehicle speed sensor to ECM is too high or intermittent.

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Speedometer may not work properly
  • Transmission shifting problem

P0503 1999 FORD F150 Meaning

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.

More Information

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