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
- Step 1: Check vent valve solenoid resistance
Resistance within spec - Step 2: Check vent valve wiring
Wiring intact - Step 3: Inspect vent valve for blockage (dirt/insect nest)
Valve clear - Step 4: Replace vent valve if faulty
New valve operates correctly - 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.
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Source: SAE J2012 standard DTC list + OBD-II portal
Category: OBD-II
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