Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSHYUNDAI2009TUCSON LIMITED, 2.0 BREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISDTC TROUBLESHOOTING PROCEDURES (2.0L)TROUBLESHOOTING FOR DTCP0505 IDLE AIR CONTROL SYSTEMDTC DETECTING CONDITION

2009 Hyundai Tucson Limited, 2.0 B

P0505 Idle Air Control System: DTC Detecting Condition

2009 Hyundai Tucson Limited, 2.0 BSECTION DTC Detecting Condition

Item	Detecting Condition	Possible Cause
DTC Strategy	Plausibility check (Engine speed deviation monitor under cold start)	Restriction in intake or exhaust system Carbon or foreign objects Contact resistance in connectors Faulty ISC valve
Enable Conditions	No relevant failure Catalyst heating active Ambient Pressure > 800 hPa 11V < Battery voltage < 16V Under normal engine running conditions
Threshold Value	Integral of deviation between setpoint RPM and actual speed RPM is out of the threshold value.
Diagnostic Time	10~20 sec.
Mil On Condition	2 Driving Cycles

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.