Basic checks
Veepeak OBDCheck BLE
A Bluetooth LE adapter for reading standard engine codes and supported live data.
View on AmazonP0455
Evaporative Emission System Leak Detected (Large Leak)
Moderate severity
This means your car's computer has found a significant leak in the system designed to capture fuel vapors, often indicating a loose gas cap or a larger crack in a hose.
The Powertrain Control Module (PCM) has detected a large leak in the Evaporative Emission (EVAP) system.
Common causes
- high
Loose, missing, or faulty gas cap
This is the most common and easiest fix; check the gas cap for proper sealing and tightness.
Typical part cost: $0-30 part
- medium
Cracked or disconnected EVAP hose
Inspect all visible EVAP hoses for cracks, breaks, or disconnections, especially near the fuel tank and engine.
Typical part cost: $20-100 part
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First things to check
- 1Tighten or replace gas cap
- 2Visually inspect all EVAP hoses for cracks or disconnections
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Tools you may need
Already have a compatible scanner? Use it. If not, a Bluetooth OBD2 adapter can help you confirm engine codes and check supported live sensor data before replacing parts.
Regular diagnostics
vgate iCar Pro BLE 4.0
A Bluetooth LE adapter with an automatic sleep feature for routine code and sensor checks.
View on AmazonAnother option
OBDLink CX
A Bluetooth LE adapter to consider when comparing supported vehicles and diagnostic apps.
View on AmazonIllustrations shown, not product photos. Check vehicle, phone and app compatibility before buying. These adapters do not guarantee access to ABS, airbags or manufacturer-specific systems. Clearing a code does not repair the fault and can reset emissions readiness monitors.
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Related codes
See related trouble codes
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Frequently asked questions
Will a P0455 code cause my car to fail emissions?
Yes, a P0455 code indicates an EVAP system fault, which is a common reason for failing emissions tests.
Can I fix a P0455 myself?
Often, yes. Checking and replacing the gas cap or a visibly cracked hose are common DIY fixes. More complex issues may require professional tools like a smoke machine.
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