DTC P0456 — EVAP Emission Control System Leak Detected (Very Small Leak)
P0456 indicates: EVAP Emission Control System Leak Detected (Very Small Leak).
Diagnostic summary
P0456
What it means
EVAP Emission Control System Leak Detected (Very Small Leak)
Can you drive?
✅ Safe to drive
Urgency
Low 3/10
Typical price
$20 – $250
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Updated Jun 12, 2026 Seen on Powertrain
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ℹ️ What does it mean?
EVAP Emission Control System Leak Detected (Very Small Leak)
🔍 Symptoms
- • Check Engine Light on
- • Reduced engine performance
- • Increased fuel consumption
- • Unusual engine behavior
⚠️ Possible Causes
- ⚠ Worn gas cap seal
- ⚠ Micro crack in EVAP line
- ⚠ Aged hose connection
🚗 Can I drive with this code?
Safe to drive
Generally safe to drive. Fix at your convenience.
🔧 How to Diagnose
- 1 Read DTCs with OBD-II scanner
- 2 Check freeze frame data
- 3 Inspect related components
- 4 Clear codes and test drive
🛠️ How to Fix
- 1 Replace gas cap
- 2 Smoke test EVAP system
- 3 Replace aged hoses
💰 Estimated Repair Cost
Repair cost by car / region
Early rough estimate. Accuracy improves as more real repair stories are added.
DIY / parts$7 – $163
Mechanic / labor$9 – $188
Repair range$20 – $250
❓ FAQ
What does P0456 mean?
EVAP Emission Control System Leak Detected (Very Small Leak)
How serious is P0456?
Severity: low. Generally safe to drive. Fix at your convenience.
How much does it cost to fix P0456?
Estimated repair cost: $20–$250 depending on vehicle and region.
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