2003 Chevrolet Silverado 5.3L Code P0455

Question

p0455,2003 chev silverado 5.3

Answer 1

P0455 EVAP. System Large leak detected

What can cause this code is missing fuel cap , evap lines that do not properly seal, or the FTP (fuel tank pressure) sensor that does not read properly.The use of a evap smoke machine is very usefull in this situation. or a scan tool that reads EVAP data.