What does code P0455 mean on a Acura and is it safe to drive?
P0455: Evaporative Emission System Leak Detected (Large Leak). Here's what it means on your Acura, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
PowertrainMedium urgency
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 Acura
- 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 Acura, 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 Acura
Acura P0455 follows Honda's diagnosis—start with the gas cap. On MDX and TL with the 3.5L J35, the large EVAP hose from the fuel tank to the charcoal canister is prone to cracking at the tank fitting on high-mileage examples.
Most commonly affected models
MDX 2007–2013TL 2004–2008TSX 2004–2008