P0456
EVAP System Small Leak Detected
Low — drive on, check soonPowertrain (engine & transmission)
System
Powertrain (engine & transmission)
Type
Generic (standardized)
Subsystem
Auxiliary emission controls
What it means
A very small leak has been detected in the evaporative-emissions system.
Symptoms
Check-engine light only.
Common causes
Slightly loose fuel cap, a tiny crack in an EVAP hose, or a leaking seal.
Recommended action
Re-seat the fuel cap; a smoke test pinpoints small hose or seal leaks.
Related codes
P0300Random/Multiple Cylinder Misfire DetectedP0301Cylinder 1 Misfire DetectedP0302Cylinder 2 Misfire DetectedP0303Cylinder 3 Misfire DetectedP0304Cylinder 4 Misfire DetectedP0420Catalyst System Efficiency Below Threshold (Bank 1)P0430Catalyst System Efficiency Below Threshold (Bank 2)P0171System Too Lean (Bank 1)P0174System Too Lean (Bank 2)P0172System Too Rich (Bank 1)P0175System Too Rich (Bank 2)P0101Mass Air Flow (MAF) Circuit Range/Performance
FAQ — P0456
What does code P0456 mean?
EVAP System Small Leak Detected. A very small leak has been detected in the evaporative-emissions system.
What are the symptoms of P0456?
Check-engine light only.
What causes P0456?
Slightly loose fuel cap, a tiny crack in an EVAP hose, or a leaking seal.
What should I do about P0456?
Re-seat the fuel cap; a smoke test pinpoints small hose or seal leaks.
General reference based on the SAE J2012 standard. Exact causes for your vehicle may differ — when in doubt, consult a workshop.
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