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2000 RAM 1500
3.9L V6•4WD•gas•Magnum
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Repairs0Labor520Torque141Fluid11DTC1680Battery1Maintenance0Recalls0
P2509high severityPowertrain

ECM/PCM Power Input Signal Intermittent

on 2000 Ram 1500 3.9L V6 · 4WD

What this code means

The engine controller detected an intermittent loss of power at its main power input. This can cause the module to reset or lose data during operation.

Symptoms

  • Intermittent stalling
  • Check engine light on
  • Random driveability issues

Common causes

  • Loose or corroded power connector
  • Faulty ignition switch or relay
  • Damaged wiring or poor ground
  • Failing PCM

Diagnostic steps

  1. Check battery and ground connections
  2. Inspect PCM power feed wiring and connectors
  3. Test power supply relay and ignition switch
  4. Wiggle-test harness while monitoring voltage
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