• Check Engine Light is on
• Noticeable fuel odor
• Possible decrease in fuel efficiency
• Loose or missing gas cap
• Cracked or disconnected EVAP hose
• Faulty EVAP canister or vent valve
EVAP: Evaporative Emission Control System
PCM: Powertrain Control Module
• P0440
• P0441
• P0442
EVAP System Leak Detected - Large Leak
Your car has a system that keeps gasoline fumes from escaping into the air. This code means there's a big hole or opening in that system, like if you left the gas cap off.
The EVAP (Evaporative Emission Control) system prevents fuel vapors from escaping into the atmosphere. A large leak indicates a significant failure in the system's ability to contain these vapors.
The P0455 code is triggered when the powertrain control module (PCM) detects a large leak in the EVAP system. This could be due to a loose or missing gas cap, a cracked or disconnected hose, or a faulty component within the system that allows fuel vapors to escape.
• Check gas cap for tightness and condition
• Inspect EVAP hoses for cracks or disconnections
• Perform a smoke test to locate leaks in the EVAP system
• Tighten or replace the gas cap
• Repair or replace damaged EVAP hoses
• Replace faulty EVAP canister or vent valve
• OBD-II scanner
• Smoke machine
• Basic hand tools
$50 to $200
Moderate
• Toyota Camry
• Ford F-150
• Honda Accord
• Ensure gas cap is properly tightened after refueling
• Regularly inspect EVAP hoses for wear
• Replace gas cap periodically
Emission Control Issue
• Check and tighten your gas cap first
• Visit a mechanic if the light remains on
EVAP system components may be covered under emissions warranty, typically up to 8 years or 80,000 miles.
The P0455 code has been common since the introduction of OBD-II systems in 1996, as emissions standards have become stricter.
Moderate – While not immediately critical, it can affect emissions and fuel efficiency.
Driving with an EVAP leak can lead to increased emissions and may fail emissions testing.
• Vehicle at operating temperature
• Fuel level between 15% and 85%
The EVAP system components are typically located near the fuel tank and engine bay.
Q: Can I drive with a P0455 code?
A: Yes, but it's best to fix it soon to avoid emissions issues.
Q: Will a loose gas cap cause a P0455 code?
A: Yes, a loose gas cap is a common cause of this code.
