p0505
Easy Fix
Toyota · Sedans
Idle Air Control System Malfunction
Quick Answer
Error code P0505 on your Toyota Sedans means: Idle Air Control System Malfunction. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
Avalon XLE 2022Camry XSE 2024Camry Hybrid SE 2024Corolla SE 2024Corolla Hybrid LE 2024Crown Platinum 2024Mirai Limited 2024Prius XLE 2024Camry LE 2023Camry LE 2024Camry SE 2023Camry SE 2024Camry TRD 2024Camry XLE 2024Corolla LE 2023Corolla LE 2024Corolla XSE 2024Crown Limited 2024Crown XLE 2024Prius LE 2024Prius Limited 2024
Likely Causes
How to Fix It
1
Remove and clean the idle air control valve with throttle body cleaner
2
Clean the throttle body bore and plate to remove carbon deposits
3
Inspect vacuum hoses near the throttle body for cracks or disconnections
4
Test IAC valve wiring for proper voltage and ground signals
5
Perform an idle relearn procedure after cleaning or replacement
Pro Tip
This is a common issue that most users can resolve without specialized tools. Try the first step before moving on to more complex solutions.
Parts You May Need
Idle air control valve
Throttle body cleaner
Throttle body gasket
Vacuum hoses
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