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P1743 on a BMW indicates that the transmission control module (TCM) has detected an electrical fault in the circuit for pressure control solenoid E, which is one of the solenoids inside the automatic transmission valve body that regulates hydraulic pressure. The TCM monitors the solenoid's electrical current and voltage and sets this code when the readings fall outside the expected range, indicating an open circuit, short circuit, or excessive resistance. This fault can affect shift quality and transmission operation, but the vehicle may still be drivable depending on the failure mode.
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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