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2020 TESLA MODEL 3
Performance Dual Motor AWD•AWD•AUTOMATIC•ev
21 active safety recalls on this vehicle — view recalls
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Repairs0Labor317Torque4746Fluid5DTC1479Battery1Maintenance0Recalls21
P2509high severityPowertrain

ECM/PCM Power Input Signal Intermittent

on 2020 Tesla Model 3 Performance Dual Motor AWD · AWD

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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