Applicable Systems
OBD-II

Symptoms

EVAP vent valve electrical circuit malfunction; vent valve controls canister air intake during purge; system cannot self-test.

Possible Causes

  • Vent valve solenoid failure
  • Vent valve wiring fault
  • Vent valve mechanical blockage

Troubleshooting Steps

  1. Step 1: Check vent valve solenoid resistance
    Resistance within spec
  2. Step 2: Check vent valve wiring
    Wiring intact
  3. Step 3: Inspect vent valve for blockage (dirt/insect nest)
    Valve clear
  4. Step 4: Replace vent valve if faulty
    New valve operates correctly
  5. Step 5: Clear code and perform EVAP self-test
    EVAP test passes

How to Reset

Clear with OBD-II scanner after repair.

Common Replacement Parts

  • EVAP Vent Valve (OEM spec)

Frequently Asked Questions

  • Q: Where is the vent valve?

    Usually at charcoal canister, often under vehicle near fuel tank. Some vehicles have canister in engine bay.

Related OBD-II Generic (SAE J2012) Fault Codes

Source: SAE J2012 standard DTC list + OBD-II portal

Category: OBD-II