What are the common causes of P0457?

Fuel cap not tightened after fueling. Damaged or missing fuel cap. Incorrect aftermarket fuel cap. Fuel cap seal worn or cracked. Filler neck damage preventing a proper seal.

Tighten the fuel cap and clear the code. Run a drive cycle to confirm the code does not return. Inspect the fuel cap for damage and replace with an OE cap if worn. Check the filler neck for damage. Smoke test the filler area if the issue persists.

P0457

Evaporative Emission Control System Leak Detected (Fuel Cap Loose/Off)

System: Auxiliary emission controls (P code)
Lamp: Check Engine Light
Category: Powertrain - Auxiliary Emissions Controls

What it means

P0457 means Evaporative Emission Control System Leak Detected (Fuel Cap Loose/Off).

Check these first

Fuel cap not tightened after fueling
Damaged or missing fuel cap
Incorrect aftermarket fuel cap
Fuel cap seal worn or cracked
Filler neck damage preventing a proper seal

What to do next

Tighten the fuel cap and clear the code
Run a drive cycle to confirm the code does not return
Inspect the fuel cap for damage and replace with an OE cap if worn
Check the filler neck for damage
Smoke test the filler area if the issue persists

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Updated

Generic SAE J2012 definition. Last updated 2026-08-30.