P0499 - EVAP Vent Valve Circuit High

EVAP vent valve control circuit high.

Code Overview

EVAP vent valve control circuit high.

Common Causes

• Valve/sensor failure
• Wiring/connectors issue
• EVAP leak/restriction

Diagnostic Steps

1. Inspect gas cap and EVAP hoses
2. Inspect wiring/connectors
3. Command purge/vent (if available)
4. Smoke test EVAP system if available

Likely Repairs & Cost Guides

Use test results to confirm the fault before pricing the repair.

Related OBD Codes

Browse the closest code-family pages when the same fault pattern often shows up nearby.

Next Steps

Move from the code to a diagnosis path, then into repair pricing once the fault is confirmed.