P0455 on a 2017 Hyundai Santa Fe Sport
P0455 means the EVAP system failed a leak check badly enough that the computer sees a large leak or no pressure/vacuum change.
Not your vehicle? See general P0455 info.
Most common causes on the 2017 Hyundai Santa Fe Sport
Ranked from 340 NHTSA owner complaints filed for this vehicle.
- 1
Charcoal canister damaged by road debris
High severityOne owner reports a rock strike cracked the charcoal canister, noting the platform has no protective skid plate over it; a cracked canister produces a large, steady leak.
Reported in 1 NHTSA complaintParts:charcoal canister - 2
EVAP line/fitting leak near the fuel tank/pump module
Medium severityOne owner reported a strong, persistent fuel odor after fuel-tank/pump recall service, consistent with a disturbed or poorly reseated EVAP line.
Reported in 1 NHTSA complaint - 3
Loose, missing, or faulty fuel filler cap
Low severityThe most common cause of a large-leak EVAP code industry-wide; confirm the cap seats and seals fully.
Common causeParts:fuel filler cap - 4
Disconnected or badly cracked EVAP hose
Medium severityA hose popped off a fitting or split open produces a large rather than small leak; trace all lines visually.
Common causeParts:EVAP hose - 5
Vent valve (canister vent solenoid) stuck open
Medium severityIf the vent path can't close, the system never seals for the leak test.
Common cause - 6
Purge valve stuck open
Medium severityContinuous unmetered air intake mimics a large leak.
Common causeParts:purge valve
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These causes are aggregated from NHTSA owner complaints and general repair knowledge — this is not a diagnosis. P0455 on your car still needs shop confirmation before any repair.
Common symptoms
- Check engine light
- Fuel smell
- Usually no performance issue
- Failed emissions readiness
What to check before replacing parts
Check the gas cap first
Look for: A loose, missing, or cross-threaded cap is by far the most common cause of a large EVAP leak code — if it doesn't click to full tightness or the seal is cracked, that's very likely the whole fault.
Inspect visible EVAP hoses
Look for: A large leak is often obvious: a hose disconnected at a fitting, split open, or chewed through (rodent damage is common) rather than a hairline crack.
Command the purge and vent valves with a scan tool
Look for: A valve that doesn't respond at all when commanded open/closed, or stays open when it should seal, prevents the system from holding pressure/vacuum and reads as a large leak.
Smoke-test the system
Look for: With a large leak, expect an obvious plume of smoke or a clearly audible hiss at the fault location — it should be easy to spot compared to a small-leak diagnosis.
Inspect the canister and filler neck
Look for: A cracked charcoal canister housing or a corroded/rusted-through filler neck (common on older vehicles) can leak enough to prevent the system from ever holding vacuum.
Rather have a pro handle it? Find a vetted local mechanic.