garajizOBD-II code · generic
P0509
Idle Air Control System Circuit High
- System
- P0 — Powertrain (generic)
- Severity
- Minor (2/5)
- Can I keep driving?
- Usually safe to drive
What does P0509 mean?
P0509 is defined as “Idle Air Control System Circuit High”.
You can usually keep driving, but have it checked soon so a small fault doesn’t become a bigger one.
Manufacturer-specific meanings
The same code can mean something different on some makes.
- Subaru: Idle control system circuit high input
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This page is general information; an exact diagnosis needs measurements and a technician’s check.