P0457 — Evaporative Emission Control System Leak Detected (Fuel Cap Loose/Off)
Category: Powertrain Severity: Low
Updated:
DTC code P0457 means: Evaporative Emission Control System Leak Detected (Fuel Cap Loose/Off). It falls under the "Powertrain" category, with an estimated severity of Low. Common causes include loose or missing fuel cap, damaged cap seal and non-OEM or faulty cap; it's worth confirming the diagnosis before replacing parts.
Possible causes
- Loose or missing fuel cap
- Damaged cap seal
- Non-OEM or faulty cap
- Damaged filler neck
Symptoms
- Check engine light after refueling
- Check fuel cap message (some models)
- Slight fuel smell
How to diagnose it step by step
- Remove and refit the cap until it clicks.
- Inspect the rubber seal.
- Drive for a few days and see if the light goes off.
- Replace the cap if the code returns.
How to fix it
Tighten the cap until it clicks and inspect its seal. The code clears by itself after several drive cycles; if it returns, replace the cap.
Estimated repair cost
New fuel cap: $10–40.
Frequently asked questions
What does DTC code P0457 mean?
Evaporative Emission Control System Leak Detected (Fuel Cap Loose/Off).
Is code P0457 serious?
Severity Low. Usually a minor fault; check the causes listed.
Can I keep driving with code P0457?
Yes, with no risk.
Related codes
P0456 P0455 P0453 P0452 P0449 P0447 P0446 P0443 P0442 P0441
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