DTC P0442:00, P0455:00, P0456:00: Notes

WARNING: This page is about a different variant/trim than selected.

DTC P0442:00	P0442:00: Evaporative emission system leak detected (small leak)
DTC P0455:00	P0455:00: Evaporative emission system leak detected (gross leak/no flow)
DTC P0456:00	P0456:00: Evaporative emission system leak detected (very small leak)
DETECTION CONDITION	P0442:00 indicates that a leak has been detected as small as 1 mm {0.040 in} in the EVAP system when there is less than 0.625 kPa (PID FTP_H2O displays "2.5") bleed-up over 15 s at 75% fuel fill. Bleed-up and evaluation time vary as a function of fuel fill level. The vapor generation limit is more than 0.625 kPa (PID FTP_H2O displays "2.5") over 120 s. P0455:00: PCM measures the fuel tank pressure while applying engine vacuum to the EVAP system. If fuel tank pressure does not reach -1.74 kPa (PID FTP_H2O displays "-7.0") or above vacuum for a 30 s evaluation time, the PCM determines that the EVAP system is blocked or has a large leak. P0456:00 indicates that a fuel vapor leak from an opening as small as 0.508 mm {0.020 in} has been detected by the EVAP running loss monitor test.
POSSIBLE CAUSE	DTC P0442:00, P0456:00 After-market EVAP hardware (such as fuel-filler cap) not conforming to required specifications. Small holes or cuts in fuel vapor hoses/tubes (P0442:00, P0456:00). CV solenoid stays partially open on closed command. Damaged, cross-threaded or loosely installed fuel-filler cap. EVAP system component seals leaking. Purge solenoid leaking to atmosphere DTC P0455:00 After-market EVAP hardware (such as fuel-filler cap) not conforming to required specifications. Disconnected or cracked CV solenoid valve tube, purge solenoid valve outlet tube, or EVAP return tube. Loose, malfunctioning, damaged or missing fuel-filler cap. Loose fuel vapor hose/tube connections to EVAP system components. Blockages or restrictions in fuel vapor hoses/tubes between engine and fuel tank pressure sensor. Rollover valve or fuel shut-off valve blocked. CV solenoid valve stuck open. EVAP purge solenoid valve stuck closed or blockage Mechanically inoperative Fuel tank pressure sensor. Damaged charcoal canister.