P0502 OBD II Trouble Code Vehicle Speed Sensor A Low Input

Symptoms of P0502 OBD II Trouble Code

  • Erratic speedometer/odometer operation
  • Irregular transmission shift patterns
  • Illumination of the service engine soon lamp, traction control lamp, or antilock brake lamp
  • Unexpected activation/deactivation of the traction control system (if equipped)
  • Other transmission and ABS codes may be stored
  • The ABS system may be rendered inoperable in some cases

Common Causes of P0502 OBD II Trouble Code

  • Excessive metal debris buildup on speed sensor/s
  • A defective wheel speed or vehicle speed sensor
  • Cut or otherwise damaged wiring harnesses or connectors (especially near speed sensors)
  • Damaged or worn teeth on a reluctor ring
  • A faulty PCM, ABCM, or EBCM

Severity of P0502 OBD II Trouble Code

Since the conditions which may cause a P0502 code to be stored could create drivability and ABS issues, it should be classified as severe and addressed as quickly as possible.