P0505Severity: Medium
P0505 – Idle Air Control System
Idle speed control (IAC) is not working as expected.
What it means
The ECU cannot regulate idle speed. A dirty idle air control (IAC) valve or carbon on the throttle body are common causes.
Symptoms
- Rough/surging idle
- Stalling
- High or low idle
- Hard starting
Common causes
- Dirty throttle body/IAC valve
- Vacuum leak
- Faulty IAC motor
- Wiring issue
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Frequently asked questions
What does trouble code P0505 mean?
P0505 – Idle Air Control System. The ECU cannot regulate idle speed. A dirty idle air control (IAC) valve or carbon on the throttle body are common causes.
Can I drive with a P0505 code?
You can usually drive short distances, but it's best to have it checked before it gets worse.