P2506 – ECM/PCM Power Input Range/Performance

Description

The ECM detects an incorrect voltage range at its power input.

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Symptoms

  • Poor acceleration
  • Hesitation
  • Check engine light

Causes

  • Weak battery
  • Faulty alternator
  • Wiring issues

Diagnosis

  • Test battery
  • Check alternator output
  • Inspect wiring

Repair

  • Replace battery
  • Repair wiring