This indicates a fuel vapor leak in the evap control system.
Bmw x5 evap system.
It means a very small leak has been detected.
P0444 bmw description the evaporative emission system canister purge volume control solenoid valve uses a on off duty to control the flow rate of fuel vapor from the evap canister.
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The evap canister purge volume control solenoid valve is moved by on off pulses from the engine control module.
P2402 bmw description 5 hours after the ignition switch is turned off the electric vacuum pump creates negative pressure vacuum in the evap evaporative emission system.
The longer the on pulse the greater the amount of.