P1397 – Crankshaft Position Sensor Intermittent High Voltage (Nissan)

Description

The ECM detected an intermittent high‑voltage crankshaft sensor signal.

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Symptoms

  • Hard start
  • Stalling

Causes

  • Short to power
  • Sensor failure
  • Wiring issue

Diagnosis

  • Check wiring for shorts
  • Inspect sensor
  • Scan crank signal

Repair

  • Repair wiring
  • Replace sensor