P2505 – ECM/PCM Power Input Signal

Description

The ECM detects an incorrect power input signal.

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Symptoms

  • Rough idle
  • Engine stalling
  • Check engine light

Causes

  • Weak battery
  • Loose ground
  • ECM fault

Diagnosis

  • Check battery voltage
  • Inspect grounds
  • Test ECM

Repair

  • Replace battery
  • Repair grounds