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TuningBot DTC Database · v4.37.14

P0442 Evaporative Emission Control System leak Detected (small leak)

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

P · PowertrainEmissionsOBD2
Brand pages:Ford

Generic (OBD-II) interpretation

P0442
Evaporative Emission Control System leak Detected (small leak) Generic · emissions Data confidence 90%

The control module detected a leak in the Evaporative Emission Control System during the system leak monitor.

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
P0442:00
EVAP System Leak Detected (small leak) (0.040” leak) Ford · emissions Data confidence 94%

Ford documents P0442:00 (no sub type information) for its 2024-2025 gasoline-engine OBD monitor strategy as evap system leak detected (small leak) (0.040” 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 P0442

P

Powertrain: engine, transmission and driveline systems.

0

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

442

Specific fault index within the subsystem.

Frequently asked questions about P0442

What does P0442 mean?

Evaporative Emission Control System leak Detected (small leak). The control module detected a leak in the Evaporative Emission Control System during the system leak monitor.

Is P0442 generic or manufacturer-specific?

P0442 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 P0442 at file level?

If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry and, where the ECU needs it, corrects the checksum too. 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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