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TuningBot DTC Database · v4.37.15

P0455 Evaporative emission (EVAP) system - large leak detected

Generic (OBD-II) interpretation + 1 manufacturer-specific in the TuningBot DTC database.

P · PowertrainEmissionsOBD2
Brand pages:Ford

Generic (OBD-II) interpretation

P0455
Evaporative emission (EVAP) system - large leak detected Generic · emissions Data confidence 85%

The control module detected a condition consistent with a leak affecting the Evaporative emission (EVAP) system - large.

Symptoms

  • MIL illuminated
  • Possible fuel smell in case of larger leaks

Possible causes

  • Hose connection(s)
  • intake leak
  • EVAP canister
  • EVAP canister purge valve

Recommended checks

  • Check fuel filler cap seating first
  • Read fuel tank pressure sensor values
  • Actuate purge and vent valves and verify response
  • Smoke-test the EVAP system for leaks

Manufacturer-specific interpretations

Ford

1 interpretation
P0455:00
EVAP System Leak Detected (large leak) Ford · emissions Data confidence 94%

Ford documents P0455:00 (no sub type information) for its 2024-2025 gasoline-engine OBD monitor strategy as evap system leak detected (large leak). This three-byte interpretation is application-specific and identifies the detected monitor condition rather than a confirmed failed component.

Recommended checks

  • Perform a full module scan
  • Review freeze-frame and occurrence data
  • Compare commanded and measured values
  • Check applicable OEM service information
Applies to Ford gasoline-engine OBD applications|2024-2025 model years

Related and nearby codes

P04 range
P0400P0401P0402P0403P0404P0405P0406P0407P0408P0409P040AP040BP040CP040DP040EP040FP0410P0411

How to read P0455

P

Powertrain: engine, transmission and driveline systems.

0

Generic SAE-standard code: same meaning on every make.

455

Specific fault index within the subsystem.

Frequently asked questions about P0455

What does P0455 mean?

Evaporative emission (EVAP) system - large leak detected. The control module detected a condition consistent with a leak affecting the Evaporative emission (EVAP) system - large.

Is P0455 generic or manufacturer-specific?

P0455 exists both as a generic OBD-II code (same meaning on every make) and with 1 manufacturer-specific interpretation(s): Ford. Always read it in the context of your vehicle.

Can TuningBot remove P0455 at file level?

If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry. Checksum correction is not included: it is a separate, optional service. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.

Other file services

Stage 1/2/3 TuningDPF RemovalEGR RemovalAdBlue / SCR RemovalDTC RemovalIMMO OFFSpeed Limiter (Vmax)

Understand the system behind this code: EVAP System

ECU tuningStage 1 dyno results for Ford engines See the results →

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