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HOMESERVICE MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN CARGO EXTENDED, 5.7 R, L31/KL8REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 58 (ENGINE CONTROLS - SELF-DIAGNOSTICS)DIAGNOSTIC TESTSDTC P0446: EVAP VENT SOLENOID VALVE CONTROL SYSTEMDTC PARAMETERS
2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8

DTC Parameters

2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8SECTION DTC Parameters
WARNING: This page is about a different car, the 2002 Saturn LW200, 2002 Saturn L200, and 2002 Saturn L100. However, it is still accessible from the selected car via links, so may be relevant.
  • EVAP vent solenoid is commanded off (open).
  • EVAP purge solenoid is commanded to PWM (open).
  • Fuel tank level is 15-85 percent.
  • BARO more than 75 kPa.
  • ECT and IAT between 39-86°F (4-30°C) at engine start-up.
  • ECT and IAT are within 14°F (8°C) of each other.
  • Throttle angle 10-35 percent.
  • Vehicle speed less than 70 MPH.
  • No ECT, fuel tank pressure, IAT, MAP, HO2S1, PCM internal fault, TP or VSS DTCs are set.

DTC sets when fuel pressure sensor voltage is less than 0.7 volt for more than 100 seconds during DTC diagnostic test, indicating a blocked vent system.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.