WOMS
P code powertrain Medium severity

P1446 Evaporative Vac Solenoid Circuit Malfunction

The OBD2 code P1446 indicates a malfunction in the evaporative vacuum solenoid circuit, which is part of the vehicle's evaporative emissions control system

Definition

The OBD2 code P1446 indicates a malfunction in the evaporative vacuum solenoid circuit, which is part of the vehicle's evaporative emissions control system

Common causes

  • Faulty evaporative vacuum solenoid
  • Damaged wiring or connectors
  • Vacuum leaks in the EVAP system
  • Faulty engine control module (ECM)
  • Blocked or clogged EVAP lines
  • Failed charcoal canister
  • Corroded or loose electrical connections

Common misdiagnoses

  • Faulty Evaporative Emission Control System
  • Bad Charcoal Canister
  • Defective Fuel Tank Pressure Sensor
  • Wiring issues or shorts in the circuit
  • Malfunctioning Engine Control Module (ECM)
  • Vacuum leaks in the system
  • Faulty purge valve or solenoid
  • Incorrectly installed or damaged hoses

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. Addressing all related codes can help pinpoint the issue

  2. 2. Inspect the Wiring and Connectors

    Visually inspect the wiring and connectors associated with the evaporative vacuum solenoid. Look for signs of damage, corrosion, or loose connections. Repair or replace any damaged components

  3. 3. Test the Evaporative Vacuum Solenoid

    Use a multimeter to test the solenoid for proper operation. Check for continuity and ensure that it opens and closes when power is applied. If the solenoid is faulty, replace it

  4. 4. Check the Power and Ground Supply

    Verify that the solenoid is receiving the correct voltage and ground signal. Use a multimeter to check for voltage at the connector while the ignition is in the "on" position. If there is no power, trace the circuit back to the fuse and relay

  5. 5. Inspect the EVAP System Components

    Check other components of the evaporative emissions system, such as the charcoal canister, purge valve, and fuel tank pressure sensor. Look for leaks, blockages, or malfunctions that could affect the system

  6. 6. Perform a Smoke Test

    If you suspect a leak in the EVAP system, perform a smoke test to identify any leaks in the system. This can help locate issues that may not be visible during a visual inspection

  7. 7. Clear the Codes and Test Drive

    After making repairs, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns. Monitor the system for proper operation

  8. 8. Consult Repair Manuals or Technical Service Bulletins (TSBs)

    If the issue persists, consult the vehicle's repair manual or look for any TSBs related to the P1446 code for specific guidance related to your vehicle make and model

  9. 9. Seek Professional Help

    If you are unable to resolve the issue after following these steps, consider seeking assistance from a qualified mechanic or automotive technician who has experience with EVAP system diagnostics. By following these troubleshooting steps, you can systematically identify and resolve the issue related to the P1446 code