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2005 RAM 3500
5.9L I6 Cummins•4WD•diesel•ISB•turbo
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Repairs0Labor523Torque138Fluid11DTC1684Battery1Maintenance0Recalls0
P0413low severityPowertrain

Secondary Air Injection System Switching Valve A Circuit Open

on 2005 Ram 3500 5.9L I6 Cummins · 4WD

What this code means

The PCM detected an open electrical circuit in the secondary air injection switching valve A. This valve controls airflow used to reduce emissions during cold starts.

Symptoms

  • Check engine light on
  • Failed emissions test
  • Rough cold start idle

Common causes

  • Faulty switching valve A
  • Open wiring or connector
  • Blown fuse or relay
  • Faulty PCM driver circuit

Diagnostic steps

  1. Scan and confirm P0413
  2. Inspect valve wiring and connectors
  3. Check valve resistance and voltage
  4. Test PCM control signal
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