whats common causes for this code p0442

Question

already change fuel cap, canister vent valve, and clear codes. the light still on!!
code present
p0442 evaporative emission system small leak detected

any ideas on what can be
thinking maybe pcm  but not sure
 thanks

Answer 1

P0442 Evaporative emission control system Leak Detected (Small)

Evap smoke machine are helpful when dealing with small leaks, Another use is a scan tool looking at the FTP (Fuel tank pressure) data. and reading what the pressure or vacuum is at, When it comes to P0442 this code tends to be more a FTP sensor reading incorrectly