AutoCodes – KIA – P0505 KIA

P0505 KIA Code - Idle Air Control System

Quick Answer

This system automatically controls engine idle speed to a specified level. Common causes include Faulty Idle Air Control valve, Idle Air Control valve harness is open or shorted, Idle Air Control valve poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0505 KIA indicates Idle Air Control System.
Common causes: Common causes include Faulty Idle Air Control valve, Idle Air Control valve harness is open or shorted, Idle Air Control valve poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 10,261

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

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Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0505 KIA Description

This system automatically controls engine idle speed to a specified level. Idle speed is controlled through fine adjustment of the amount of air which by-passes the throttle valve via Idle Air Control Valve IACV) and Auxiliary Air Control AAC) Valve. The IACV-AAC valve changes the opening of the air by-pass passage to control the amount of auxiliary air. This valve is actuated by a step motor built into the valve, which moves the valve in the axial direction in steps corresponding to the Engine Control Module (ECM) output signals.
One step of IACV-AAC valve movement causes the respective opening of the air by-pass passage. (i.e. when the step advances, the opening is enlarged.) The opening of the valve is varied to allow for optimum control of the engine idling speed. The crankshaft position sensor (POS) detects the actual engine speed and sends a signal to the ECM. The ECM then controls the step position of the IACV-AAC valve so that engine speed coincides with the target value memorized in ECM. The target engine speed is the lowest speed at which the engine can operate steadily. The optimum value stored in the ECM is determined by takig into consideration various engine conditions, such as during warm up, deceleration, and engine load (air conditioner, power steering and cooling fan operation).

OBDII Code P0505 KIA - Idle Air Control System - AutoCodes.com — P0505 KIA Code - Idle Air Control System

What does this mean?

What are the Possible Causes of the DTC P0505 KIA?

Faulty Idle Air Control valve
Idle Air Control valve harness is open or shorted
Idle Air Control valve poor electrical connection

How to Fix the DTC P0505 KIA?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0505 KIA code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0505 KIA Code

1. What does the OBD-II code P0505 mean on a Kia?

P0505 indicates a problem with the Idle Air Control (IAC) system, which regulates the engine's idle speed.

2. What are the common symptoms of code P0505 in a Kia vehicle?

Symptoms include irregular or high idle, engine stalling, poor fuel economy, and difficulty starting the car.

3. What causes the P0505 code to appear in a Kia?

Common causes include a faulty Idle Air Control (IAC) valve, clogged air passages, vacuum leaks, a dirty throttle body, or faulty wiring.

4. Can a dirty throttle body trigger code P0505 in my Kia?

Yes, a dirty or carbon-clogged throttle body can restrict airflow and cause the IAC system to malfunction, triggering the code.

5. How do I fix the P0505 code on a Kia?

Start by cleaning the throttle body and IAC valve, checking for vacuum leaks, and inspecting wiring. If the issue persists, the IAC valve may need replacement.

6. Can driving with the P0505 code damage my Kia?

While it may not immediately cause damage, driving with an unstable idle can lead to stalling, reduced performance, and increased wear on engine components.

7. How much does it cost to fix a P0505 code on a Kia?

The cost depends on the issue, ranging from $100 for throttle body cleaning to $300-$500 for IAC valve replacement, excluding labor.

8. How do I know if the IAC valve is faulty and causing P0505?

A faulty IAC valve often causes erratic idling, engine stalling, and may fail to respond to idle speed adjustments during testing.

9. Can a vacuum leak cause the P0505 code on my Kia?

Yes, vacuum leaks disrupt the IAC system's ability to control idle speed, leading to the P0505 code.

10. Is it safe to reset the P0505 code without fixing the issue?

Resetting the code without addressing the underlying issue may temporarily clear the warning but won't fix the problem, and the code is likely to return.