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TorqueMech OBD Code Guide

P0440 - Evaporative Emission Control System Malfunction

General EVAP system fault detected.

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Code Meaning

General EVAP system fault detected.

Common Causes

Loose/damaged gas cap
EVAP hose leak
Purge/vent valve issue
Charcoal canister issue

Quick Checks

  • Tighten/inspect gas cap
  • Inspect EVAP hoses for cracks
  • Smoke test EVAP system if available
  • Check purge/vent valve operation

Likely Repairs

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

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Related Codes

P0442
EVAP Small Leak Detected
Open ->
P0446
EVAP Vent Control Circuit
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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