Can I drive with P0455?

Yes, you can keep driving. Often caused by a loose or missing gas cap, so check it first. Usually safe to drive for a short time, but get it checked.

What does P0455 mean?

P0455 stands for Evaporative Emission Control System Leak Detected (gross leak / large leak).

Symptoms you may notice

• Steady check engine light with minimal drivability symptoms
• Normal engine power, idle, and acceleration
• Possible faint gasoline vapor smell near gas cap

How much does it cost to fix?

Repair costs for code P0455 depend on the specific underlying root cause, ranging from simple DIY checks to component replacement. The table below lists the most common causes and rough price ranges in USD:

• Loose, missing, or cross-threaded gas cap
  $0-$25 common
• Disconnected or cracked EVAP vapor hose
  $20-$60 possible
• EVAP vent solenoid stuck wide open
  $40-$130 possible
• Rotted or cracked fuel filler neck pipe
  $100-$300 rare

What to do next

1. Pull over when convenient, unscrew your gas cap, inspect the rubber gasket, and click it tight.
2. Drive for 2-3 days; modern cars re-test the system and will turn the light off automatically.
3. If the light stays on, replace the gas cap with an OEM cap before paying for a smoke test.

Related codes

About this code

Code P0455 indicates a large evaporative system leak, often caused by a loose or missing gas cap. Tightening or replacing a gas cap frequently resolves it. Your car usually runs normally in the short term, with low immediate risk of engine damage.