What does code P1503 mean on BMW vehicles?
The ECU detects a low signal condition in the closing solenoid control circuit of the idle speed control valve.
OBD-II Code BMW
P1503 — BMW — Idle Speed Control Valve Closing Solenoid Control Circuit Signal Low
The ECU detects a low signal condition in the closing solenoid control circuit of the idle speed control valve.
Common symptoms
- Unstable idle speed
Possible causes
- Open circuit
- high resistance wiring
- faulty solenoid
Initial recommendation
Check wiring continuity and solenoid operation.
Safety notice
This information is for guidance only. Brand-specific codes may vary by model, year, engine, transmission and vehicle configuration. It does not replace a physical inspection or diagnosis by a qualified mechanic. If the vehicle is unsafe to operate, avoid driving it and seek professional inspection.
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