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P1444 on a BMW means the engine control module (DME) has detected an open circuit in the control wire for the Diagnostic Module Tank Leakage (DM-TL) pump, which is the pump used during the evaporative emission system leak test. The computer commands the pump on and monitors the circuit, but it sees no current flow or an unexpected voltage, so it flags the control circuit as open.
Guidance is general and written for BMW vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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