P1556 – Accelerator Pedal Position Sensor Low (Nissan)

Description

The ECM detected a low input signal from the accelerator pedal position sensor.

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Symptoms

  • Hesitation
  • Poor acceleration

Causes

  • Sensor failure
  • Open circuit
  • Wiring issue

Diagnosis

  • Check sensor voltage
  • Inspect wiring
  • Scan throttle data

Repair

  • Replace sensor
  • Repair wiring