EVAP System Leak Detected (Very Small Leak)
Powertrain Code · Low
What does P0456 mean?
A very small leak has been detected in the EVAP system. Often caused by an aging gas cap seal, hairline crack in an EVAP hose, or minor seal degradation.
System: EVAP System
P0456 is a powertrain diagnostic trouble code indicating evap system leak detected (very small leak). This code is classified as low severity, which means: minor issue — monitor and fix at convenience. We have vehicle-specific diagnostic data for 43 models below. Select your vehicle for tailored causes, symptoms, and repair cost estimates.
Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your vehicle.
See causes, symptoms, and repair costs for P0456 on specific vehicles: