P0503 – Vehicle Speed Sensor Intermittent

Description

The ECM detects an intermittent or erratic signal from the vehicle speed sensor.

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Symptoms

  • Speedometer jumps
  • Harsh shifting
  • Cruise control drops out

Causes

  • Loose connector
  • Damaged wiring
  • Faulty VSS sensor

Diagnosis

  • Inspect connector
  • Monitor VSS data
  • Check wiring continuity

Repair

  • Repair wiring
  • Replace VSS sensor