What Does P1456 Mean?
A small leak has been detected in the fuel tank portion of the evaporative emission control system. This code indicates a minor but persistent vapor leak that allows fuel vapors to escape.
Common Causes
35%
Faulty or worn fuel cap seal
25%
Small crack or pinhole in EVAP hoses or lines
20%
Leaking fuel tank pressure sensor or grommet
12%
Faulty vent valve not sealing properly
8%
Small leak at fuel pump module seal
Diagnostic Steps
1
Step 1: Inspect fuel cap and gasket for damage, replace and clear codes to retest
2
Step 2: Perform smoke test on EVAP system focusing on fuel tank components
3
Step 3: Inspect fuel tank pressure sensor and mounting grommet for leaks
4
Step 4: Check EVAP vent valve sealing using vacuum test or scan tool commands
5
Step 5: Examine fuel pump module seal and connections for small leaks
Estimated Repair Cost
$75 - $600
Parts + labor, varies by vehicle and location
A small leak has been detected in the fuel tank portion of the evaporative emission control system. This code indicates a minor but persistent vapor leak that allows fuel vapors to escape.
The most common cause of P1456 (EVAP Emission Control System Leak Detected (Fuel Tank System)) is: Faulty or worn fuel cap seal
Typical repair costs for P1456 range from $75 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive with minimal risk. May notice slight fuel odor and will fail emissions inspection.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1456 to identify the root cause.
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Quick Info
Category
Powertrain
System
Evaporative Emission Control System
Difficulty
Type
Manufacturer
Recommended Tools
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