P0505 on BMW — Idle Control System Malfunction
BMW
Verified1 source
1 source
- Official data (NHTSA)official_feed
What P0505 means
Caution — monitor closely
The ECU can't hold idle speed within its commanded range — usually a dirty throttle body or faulty idle control valve.
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General information, not a diagnosis or repair instruction. Always confirm with a qualified mechanic for your specific vehicle.
Common causes
- Dirty throttle body
Symptoms
- Повышенный расход топлива
- Fluctuating idle RPM
What to check first
- Clean the throttle body
- Check idle control valve
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