It means EVAP system Gross (large) leak. could be a gas cap not tight, purge valve worn out in vapor canister or vacuum leak somewhere in the lines to canister.
Trouble code P0455 means: EVAP System Gross Leak (0.080") Detected
what does code p3538 and code P0455 mean
P0455 code for mazda Protede... Evaporative Emission System Leak Detected (gross leak/ no flow)
P0455 requires two failures in a row to turn the light on. Pending means that it has failed the large leak test once. Treat it like an active code. P0455 evaporative emissions large leak.
Evap Leak
Large evaporative emissions leak. Check the gas cap and all the lines going from the engine to the fuel tank.
A large EVAP leak, probably a faulty gas cap
Trouble code P0455 means:Evaporative emission control system leak detected (gross leak)
Large vapor leak in the evaporative emissions system You could have a gasoline vapor leak anywhere from the gas cap to the tank to the engine.
Code P0455 for a GMC Envoy indicates a large leak in the evaporative emissions control system (EVAP). This typically means there's a significant issue, such as a loose or damaged gas cap, a broken EVAP hose, or a malfunctioning EVAP canister. It can affect the vehicle's emissions performance and may trigger the check engine light. Addressing this issue is essential for compliance with emissions regulations and ensuring optimal engine performance.
EVAP emission control system leak (large). Check to see if the fuel cap is missing or loose.
P0171 System too Lean (Bank 1)