2007 Chevy Colorado 2.9 Code P0442

Question

Smoke test performed. Replaced the vapor canister vent solenoid and harness. Check engine light came back on after about 500 miles. Replaced gas cap. HELP!!!

Answer 1

P0442 Small EVAP leak detected

Chevy has a TSB about this condition TSB# PIT4943C What this is about is the difficulty in determining the the cause of the EVAP leak. 2 problem has been identified one being the purge control solenoid,where it does not seal properly, and the other is the FTP (Fuel tank pressure ) sensor. There has been alot of sucessful repair with the replacement of the FTP where the FTP was not showing the proper vacuum decay.