2005 Nissan Titan Code P0455

Question

What does the engine code P-0455 mean?

Answer 1

P0455 NISSAN - EVAP Control System Gross Leak Detected
Read more: https://www.autocodes.com/p0455_nissan.html

Answer 2

This code is for a large leak in the evap system. This is usually caused by either a bad fuel cap, vent control valve or 

a sticking purge control solenoid. More often then not the vent control valve sticks open and allows for the large leak. 

You can remove the vent control valve, add power and ground and listen for it clicking. If you don't hear any noise it's 

no good and should be replaced.