P0456

Low Severity

EVAP System Very Small Leak Detected

EVAP System

What Does P0456 Mean?

A very small leak in the EVAP system — smaller than P0442.

Common Fix

Replace gas cap

Estimated Cost (DIY)

$5 - $15

Symptoms

  • ⚠️Check engine light
  • ⚠️No driveability symptoms

Related Symptoms

Check engine light on

Common Causes

Aging gas cap seallikely
Tiny crack in EVAP hosepossible
Micro-crack in canisterunlikely

How to Diagnose P0456

  1. 1Replace gas cap first
  2. 2Smoke test if cap replacement does not fix it
  3. 3Inspect all hose connections closely

OEM Diagnostic Flowchart

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Read live data and freeze frame for P0456 to pinpoint the cause before buying parts.

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Related Resources

Repair guides, symptom pages, and wiring diagrams related to P0456.

OEM Manual Evidence

Browse →
2013 Nissan-Datsun Truck Rogue 2WD L4-2.5L (QR25DE) A L L Diagnostic Trouble Codes ( DTC )OEM Manual

A L L Diagnostic Trouble Codes ( DTC ) — 2013 Nissan-Datsun Truck Rogue 2WD L4-2.5L (QR25DE) Service Manual | Operation CHARM Operation CHA...

2013 Infiniti G37 Convertible V6-3.7L (VQ37VHR) A L L Diagnostic Trouble Codes ( DTC )OEM Manual

A L L Diagnostic Trouble Codes ( DTC ) — 2013 Infiniti G37 Convertible V6-3.7L (VQ37VHR) Service Manual | Operation CHARM Operation CHARM :...

2013 Infiniti G37 Coupe V6-3.7L (VQ37VHR) A L L Diagnostic Trouble Codes ( DTC )OEM Manual

A L L Diagnostic Trouble Codes ( DTC ) — 2013 Infiniti G37 Coupe V6-3.7L (VQ37VHR) Service Manual | Operation CHARM Operation CHARM : Car r...

2013 Infiniti G37 Sedan V6-3.7L (VQ37VHR) A L L Diagnostic Trouble Codes ( DTC )OEM Manual

A L L Diagnostic Trouble Codes ( DTC ) — 2013 Infiniti G37 Sedan V6-3.7L (VQ37VHR) Service Manual | Operation CHARM Operation CHARM : Car r...

Related Symptoms

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Check engine light onSymptom Hub

A check-engine light is a graph entry point into code pages, symptom-specific diagnosis, and the exact repair categories most often associated with those failures.

Exact Vehicle Hubs

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2013 Infiniti G37 Convertible V6 3.7l (Vq37vhr) Repair HubManual

Open the exact vehicle hub grounded by OEM manual evidence related to P0456.

2013 Infiniti G37 Coupe V6 3.7l (Vq37vhr) Repair HubManual

Open the exact vehicle hub grounded by OEM manual evidence related to P0456.

2013 Infiniti G37 Sedan V6 3.7l (Vq37vhr) Repair HubManual

Open the exact vehicle hub grounded by OEM manual evidence related to P0456.

2013 Nissan Datsun Truck Rogue 2wd L4 2.5l (Qr25de) Repair HubManual

Open the exact vehicle hub grounded by OEM manual evidence related to P0456.

Related Codes

P0455: EVAP System Large Leak DetectedRelated

A significant leak in the EVAP system. Often a loose gas cap or a disconnected hose.

P0442: EVAP System Small Leak DetectedRelated

A small leak in the EVAP system, often a deteriorated gas cap seal or a tiny crack in a hose.

P0440: EVAP System MalfunctionRelated

General EVAP system fault — the system that captures fuel vapors is not working properly.

Frequently Asked Questions

Is P0456 hard to find?
Very small leaks can be difficult to find. A professional-grade smoke test machine is often needed.
Can temperature changes cause P0456?
Cold weather can temporarily trigger EVAP codes as seals contract. If it only appears in winter, the gas cap seal may be marginal.

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