Get the app
Quick access from your home screen.
P1447 on BMW vehicles means the Diagnostic Module Tank Leakage (DM-TL) pump reported a current or pressure reading that was too high during its switching phase, which is the moment the module toggles the pump to verify the evaporative system can hold a vacuum or pressure. The engine control module sets this code when the pump's electrical feedback or the resulting pressure change exceeds the expected window, indicating a restriction, a stuck pump, or a wiring fault rather than a simple leak.
Guidance is general and written for BMW vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
Get the app
Quick access from your home screen.