P1530 on a BMW means the engine control module (DME) has detected an abnormally high voltage on the control circuit for the Bank 1 B camshaft position actuator, which is the solenoid that adjusts the intake or exhaust cam timing on that bank. The circuit is seeing a signal above the expected range, so the DME cannot reliably command the actuator and sets this fault.
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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