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DTC codes / BMW codes / P1509

P1509 · BMWIdle Speed Control Valve Opening Solenoid Control Circuit Electrical

P1509 on BMW vehicles indicates that the engine control module (DME) has detected an electrical fault in the control circuit for the idle speed control valve's opening solenoid. The computer monitors the circuit for expected voltage or current and flags the code when the signal falls outside the valid range, which can prevent the valve from properly regulating idle speed.

SystemPowertrain
Code typeBMW specific
SeverityMedium
Fix difficultyIntermediate
AreaVehicle speed, idle control and auxiliary inputs
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