What does code P0455 mean on a Infiniti and is it safe to drive?
P0455: Evaporative Emission System Leak Detected (Large Leak). Here's what it means on your Infiniti, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
What this code means
A large leak has been detected in the EVAP system. Could be gas cap left off, disconnected hose, or damaged canister.
Common causes for your Infiniti
- Gas cap missing or not sealed
- Disconnected or ruptured EVAP hose
- Damaged charcoal canister
- Faulty purge/vent solenoid
Symptoms
- Check Engine Light
- Fuel smell possible
Typical fixes
- Install or replace gas cap
- Inspect and repair EVAP hoses
- Replace canister or valves as needed
Repair cost range
For a Infiniti, repairs for P0455 often fall between $20 and $500, depending on the cause and whether you use OEM or aftermarket parts. Labor rates vary by location.
Known issues on Infiniti
Infiniti P0455 follows Nissan's diagnosis—gas cap first. On FX and QX models, the EVAP canister is mounted behind the rear wheel and exposed to road debris; inspect it for cracks. A gross EVAP leak on high-mileage G37 is often the large tank vent hose.
Most commonly affected models