Drive DTCP0446 – Emissions equipment fault
Evaporative emission system vent control circuit
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, then ask for EGR passages to be cleaned before parts are replaced.
What usually fixes it
In the order a good shop checks them. Typical total: $77–$2,206 at $130 an hour.
Fuel cap or EVAP hose
The cheapest and most common emissions faults.
EGR or purge valve
Valves clog with carbon or stick open.
Catalytic converter or oxygen sensor
Fix any misfire or mixture fault first, or the new part will fail too.
This is the advice for this family of codes – Drive DTC doesn't have a page written for this exact code yet.
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 P0446
Codes in plain English, what usually causes them, what the repair costs, and whether it's safe to drive.