Drive DTCP0455 – Large leak in the fuel vapour (EVAP) system
Evaporative emission system leak detected (large leak)
Emissions · generic OBD-II code
Normal driving is fine. Book it in when it suits you; it won't hurt anything in the meantime.
Check this first
Check the fuel cap first – if it's missing or loose, tighten it and see if the light goes out.
It won't hurt the engine, but it will fail an emissions test.
What usually fixes it
In the order a good shop checks them. Typical total: $36–$362 at $130 an hour.
Fuel cap
Missing, cross-threaded or a perished seal.
EVAP hose
A hose knocked loose or split, often near the tank.
Vent valve
Stuck open, usually from dirt or corrosion.
What the vehicle can tell you itself
A stored code is a headline, not the story. The vehicle also holds the conditions when it happened, how close the part is to the limit it fails at, what the fuel trims are doing, and whether the fault is still happening right now. Drive DTC reads all of it with a USB adapter and a Windows PC – and it can't change a single setting on the vehicle.
See what your vehicle says about P0455
Codes in plain English, what usually causes them, what the repair costs, and whether it's safe to drive.