What does code P1502 mean?

P1502 · BMWIdle Speed Control Valve Closing Solenoid Control Circuit Signal High Or Low

P1502 on a BMW indicates that the engine control module (DME) has detected an abnormal voltage signal on the control circuit for the closing solenoid inside the idle speed control valve. The DME expects a specific current draw or voltage pattern when commanding the valve to close, and the measured signal is either too high (open circuit) or too low (short to ground or excessive current).

SystemPowertrain

Code typeBMW specific

SeverityMedium

Fix difficultyIntermediate

AreaVehicle speed, idle control and auxiliary inputs

Guidance is general and written for BMW vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.