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TorqueMech OBD Code Guide

P0446 - EVAP Vent Control Circuit

Vent valve control circuit fault detected.

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Code Meaning

Vent valve control circuit fault detected.

Common Causes

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

Quick Checks

  • Inspect gas cap and EVAP hoses
  • Inspect wiring/connectors
  • Command purge/vent (if available)
  • Smoke test EVAP system if available

Likely Repairs

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

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Related Codes

P0440
EVAP System Malfunction
Open ->
P0442
EVAP Small Leak Detected
Open ->
P0455
EVAP Large Leak Detected
Open ->
P0456
EVAP Very Small Leak Detected
Open ->

Next Steps

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

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