P0727 – Engine Speed Input No Signal

Description

The ECM detects no engine speed input signal.

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Symptoms

  • No start
  • Harsh shifting
  • Limp mode

Causes

  • Faulty crank sensor
  • Damaged wiring
  • ECM fault

Diagnosis

  • Monitor RPM signal
  • Inspect wiring
  • Test sensor

Repair

  • Replace crank sensor
  • Repair wiring

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