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P1550 on BMW vehicles indicates that the engine control module (DME) has detected an electrical fault in the control circuit for the closing solenoid of the idle speed control valve. The computer monitors the circuit for expected voltage or current and flags the code when the signal is out of range, which can prevent the valve from closing properly and affect idle quality.
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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