A small leak has been detected in the evaporative emission system.
Informational only. Consult a qualified mechanic.
Tighten gas cap and clear code. If it returns, smoke test the EVAP system.
The P0442 OBD-II diagnostic trouble code (DTC) indicates: evap system small leak. This is a low-severity powertrain code that your vehicle's onboard diagnostics system triggers when a small leak has been detected in the evaporative emission system. If your check engine light is on with this code, the vehicle is generally safe to drive, but you should have it inspected soon.
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