P0457: Evaporative Emission Control System Leak Detected (Fuel Cap Loose/Off)
Can you still drive? Yes, simply tighten or replace the gas cap. The code should clear on its own after a few drive cycles.
What Does P0457 Mean?
Code P0457 specifically indicates that the EVAP system has detected a leak consistent with a loose or missing fuel cap. Unlike the generic leak codes, P0457 is designed to alert the driver that the fuel cap was not properly tightened. Many vehicles will display a separate fuel cap warning message alongside the check engine light.
Need to read your codes?
An OBD-II scanner lets you read and clear diagnostic trouble codes from your vehicle's computer. Most scanners work with any car made after 1996.
Browse OBD-II Scanners on AmazonCommon Causes
- Gas cap not tightened until clicking
- Damaged gas cap seal
- Cracked or cross-threaded gas cap
- Damaged fuel filler neck threads
Symptoms
- Check engine light on
- Fuel cap warning message on dashboard
- Possible faint fuel odor
Diagnostic Steps
- 1Remove and reseat gas cap, tightening until it clicks
- 2Inspect gas cap seal for damage or wear
- 3Check fuel filler neck for damage or debris
- 4Clear code and monitor for return
- 5If code returns with new cap, inspect filler neck seal
Recommended Parts & Tools
Estimated Repair Cost
| Type | Estimated Cost |
|---|---|
| Total Repair Cost Range | $10 - $150 |
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Chat with AI About P0457Commonly Affected Vehicles
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Frequently Asked Questions
How do I fix P0457?
Tighten your gas cap until it clicks. If the cap is old or damaged, replace it with a new OEM cap. The code will typically clear after a few drive cycles.
Can P0457 come from getting gas?
Yes, if the gas cap is not fully tightened after refueling, P0457 can set within one or two drive cycles. Always tighten the cap until you hear it click.
Community Fix Reports
Community reports are user-submitted and not verified by Auto AI Buddy. Results may vary.
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