P1509 – Idle Air Control Valve High Voltage (Nissan)

Description

The ECM detected high voltage in the IACV circuit.

Want to confirm the real cause of this fault code?

A high-quality OBD2 scanner gives you live data, fuel trims, sensor readings and freeze-frame information — exactly what you need to verify the root cause of this code with confidence.

View Recommended Scanners

Symptoms

  • Check engine light
  • Rough idle

Causes

  • Short to power
  • Valve failure
  • ECM driver issue

Diagnosis

  • Check wiring for shorts
  • Inspect valve
  • Scan idle data

Repair

  • Repair wiring
  • Replace valve

Related Problems