P1720 – Vehicle Speed Sensor (Nissan)

Description

The ECM detected a malfunction in the vehicle speed sensor.

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Symptoms

  • Speedometer issues
  • Harsh shifting

Causes

  • Sensor failure
  • Wiring issue
  • Debris contamination

Diagnosis

  • Check VSS signal
  • Inspect wiring
  • Scan ECM/TCM data

Repair

  • Replace sensor
  • Repair wiring