How much does it cost to fix P0455?

Typical repair cost is $20–$600.

P0455 — Evaporative Emission System — Large Leak

Low Severity · Emissions

OBD-II code P0455 means your vehicle's ECU detected: Evaporative Emission System — Large Leak. Below: causes, step-by-step fixes, and repair cost — free, no signup needed.

Low severity — safe to drive in most cases. Clear the code and monitor. If it returns, have it inspected.

Typical Repair Cost

$20–$600

Parts + labor, national average

Severity

Low

Monitor — low urgency

🔍

Common Causes of P0455

Missing or very loose gas cap
Large crack in EVAP line
Failed purge valve stuck open

🔧

How to Fix Code P0455

Check gas cap immediately

Visual inspection of all EVAP lines

Test purge valve for proper operation

❓

FAQ — Code P0455

What does OBD-II code P0455 mean?

P0455 means your vehicle's onboard computer detected: Evaporative Emission System — Large Leak. This is a low-severity code in the Emissions category.

How much does it cost to fix code P0455?

Typical repair cost for P0455 is $20–$600 including parts and labor. Costs vary by vehicle make, model, and location. A free scan at AutoZone or O'Reilly is a good first step.

Can I drive my car with code P0455?

Code P0455 is low severity. In most cases you can drive normally, but clear the code and monitor whether it returns.

What are the most common causes of P0455?

The most common causes are: Missing or very loose gas cap, Large crack in EVAP line, Failed purge valve stuck open. Always start with the cheapest diagnosis step before replacing parts.

Will code P0455 clear itself?

Code P0455 will clear itself after the underlying issue is fixed and the ECU completes several successful drive cycles. Clearing it without fixing the root cause only masks the problem temporarily.

Is P0455 showing on your car?

Enter your VIN for a free vehicle-specific report — recalls, specs, and market value. No signup required.

🔗

Related Emissions Codes

P0400Exhaust Gas Recirculation Flow Malfunction P0401EGR Flow Insufficient P0402EGR Flow Excessive P0403EGR Control Circuit Malfunction P0404EGR Control Circuit Range/Performance P0410Secondary Air Injection System Malfunction

OBD-II code data is based on SAE J2012 standards and general repair industry data. Repair costs are national averages and vary by vehicle, location, and shop. Always consult a qualified mechanic for a diagnosis specific to your vehicle.