AutoCodes – Hyundai – P1505 Hyundai

P1505 Hyundai Code - Idle Speed Control Actuator Signal Low

Quick Answer

The Idle Speed Control Actuator (ISCA) valve is installed on the intake manifold and controls the intake airflow that is bypassed around the throttle plate to keep constant engine speed when the throttle valve is closed. Common causes include Faulty Idle Speed Control Actuator (ISCA) valve, Idle Speed Control Actuator (ISCA) valve harness is open or shorted, Idle Speed Control Actuator (ISCA) valve circuit 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: P1505 Hyundai indicates Idle Speed Control Actuator Signal Low.
Common causes: Common causes include Faulty Idle Speed Control Actuator (ISCA) valve, Idle Speed Control Actuator (ISCA) valve harness is open or shorted, Idle Speed Control Actuator (ISCA) valve circuit 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 43,414

How popular is this code, among other codes? Medium

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 25, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1505 Hyundai Description

The Idle Speed Control Actuator (ISCA) valve is installed on the intake manifold and controls the intake airflow that is bypassed around the throttle plate to keep constant engine speed when the throttle valve is closed. The function of the ISCA valve is to maintain idle speed according to various engine loads and conditions, and also to provide additional air during starting. The ISCA valve consists of an opening coil, a closing coil, and a permanent magnet. Based on information from various sensors, the Engine Control Module (ECM) controls both coils by grounding their control circuits. According to the control signals from the ECM, the valve rotor rotates to control the by pass airflow into the engine.

OBDII Code P1505 Hyundai - Idle Speed Control Actuator Signal Low - AutoCodes.com — P1505 Hyundai Code - Idle Speed Control Actuator Signal Low

What does this mean?

What are the Possible Causes of the DTC P1505 Hyundai?

Faulty Idle Speed Control Actuator (ISCA) valve
Idle Speed Control Actuator (ISCA) valve harness is open or shorted
Idle Speed Control Actuator (ISCA) valve circuit poor electrical connection

How to Fix the DTC P1505 Hyundai?

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 P1505 Hyundai 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 P1505 Hyundai Code

1. What are the common symptoms of OBDII code P1505 in a Hyundai related to the Idle Speed Control Actuator Signal Low?

The common symptoms include rough idling, stalling at stops, fluctuating idle speed, and potential issues with acceleration.

2. What are the possible causes of OBDII code P1505 in a Hyundai?

Possible causes may include a faulty idle speed control actuator, damaged wiring or connectors, a vacuum leak, or issues with the engine control module.

3. How can I diagnose the cause of OBDII code P1505 in my Hyundai?

You can start by checking the idle speed control actuator and its wiring for any visible damage. Perform a vacuum leak test, inspect the connectors for corrosion, and consider using a diagnostic scan tool to gather more information.

4. Can I drive my Hyundai with OBDII code P1505?

It is not recommended to drive your Hyundai with this code present, as it may lead to further damage or safety hazards. It's best to address the issue promptly.

5. How can I repair OBDII code P1505 in my Hyundai?

Repair options may include replacing the idle speed control actuator, repairing damaged wiring or connectors, fixing any vacuum leaks, or reprogramming the engine control module.

6. Will OBDII code P1505 cause my Hyundai to fail an emissions test?

Yes, this code can potentially cause your Hyundai to fail an emissions test due to improper idling and related issues affecting engine performance.

7. Are there any simple maintenance tips to prevent OBDII code P1505 in my Hyundai?

Regularly inspecting and maintaining the idle speed control system, checking for vacuum leaks, and ensuring proper engine maintenance can help prevent this code from appearing.

8. Can a DIY enthusiast fix OBDII code P1505 in a Hyundai?

Depending on your skill level and access to tools, DIY enthusiasts may be able to address this code by following repair guides and diagnostic steps. However, complex issues may require professional assistance.

9. How urgent is it to address OBDII code P1505 in a Hyundai?

It's important to address this code promptly to prevent potential engine damage, safety risks, and further issues with your Hyundai's performance.

10. Is it common for the Idle Speed Control Actuator Signal Low code to reappear after repairs in a Hyundai?

If the root cause of the issue is not fully addressed during repairs, the code may reappear. Thorough diagnosis and proper repair are key to preventing its recurrence.