P0455
Category: Powertrain
Urgency:
Moderate Severity
P0455: EVAP Control System Leak Detected (Gross Leak / No Flow)
Code P0455 indicates a large vapor leak in the fuel evaporative emission system, commonly triggered when the gas cap is completely open or an EVAP line is detached.
Common Symptoms of P0455
- • Check Engine Light illuminated
- • Distinct gasoline smell around the car
- • Failed emissions inspection
Root Causes for Code P0455
- • Missing or improperly closed gas cap
- • Disconnected EVAP vent hose or vacuum line
- • Stuck open EVAP purge or vent valve
- • Damaged fuel filler neck or fuel tank seal
Step-by-Step DIY Diagnostic & Inspection Guide
1
Ensure the gas cap is securely tightened.
2
Inspect the EVAP purge solenoid under the hood for cracks.
3
Test EVAP vent valve operation.
Estimated Repair Costs
Replacement Parts:
$15 - $150
Shop Diagnostic / Labor:
$60 - $180
Total Estimated Cost:
$75 - $330
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