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2005 RAM 3500
5.9L I6 Cummins•4WD•diesel•ISB•turbo
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Repairs0Labor523Torque138Fluid11DTC1684Battery1Maintenance0Recalls0
P0447low severityPowertrain

Evaporative Emission System Vent Control Circuit Open

on 2005 Ram 3500 5.9L I6 Cummins · 4WD

What this code means

The PCM detected an open circuit in the EVAP vent control valve. This prevents proper sealing and venting of the fuel vapor system.

Symptoms

  • Check engine light on
  • Failed emissions test
  • No noticeable driveability change

Common causes

  • Faulty vent control valve
  • Open or broken wiring
  • Corroded connector
  • Failed PCM driver circuit

Diagnostic steps

  1. Retrieve code and freeze frame
  2. Inspect vent valve wiring and connector
  3. Test vent valve resistance and operation
  4. Verify PCM control signal
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