How much does it cost to fix P0456?

Typical repair cost is $20–$600.

P0456 — Evaporative Emission System — Very Small Leak

Low Severity · Emissions

OBD-II code P0456 means your vehicle's ECU detected: Evaporative Emission System — Very Small 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

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Common Causes of P0456

Tiny crack in EVAP system
Gas cap seal worn

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How to Fix Code P0456

Replace gas cap first ($15)

Smoke test to find micro-leak

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FAQ — Code P0456

What does OBD-II code P0456 mean?

P0456 means your vehicle's onboard computer detected: Evaporative Emission System — Very Small Leak. This is a low-severity code in the Emissions category.

How much does it cost to fix code P0456?

Typical repair cost for P0456 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 P0456?

Code P0456 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 P0456?

The most common causes are: Tiny crack in EVAP system, Gas cap seal worn. Always start with the cheapest diagnosis step before replacing parts.

Will code P0456 clear itself?

Code P0456 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 P0456 showing on your car?

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

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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.