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Engine-Codes – Generic – P0505

P0505 Code - Idle Control System Malfunction

Quick Answer

The P0505 diagnostic trouble code (DTC) indicates an issue with the idle control system in a vehicle. Common causes include Faulty idle air control valve, Dirty or clogged throttle body, Vacuum leaks in the intake system. 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 indicates Idle Control System Malfunction.
Common causes
Common causes include Faulty idle air control valve, Dirty or clogged throttle body, Vacuum leaks in the intake system.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code P0505 Description

The P0505 diagnostic trouble code (DTC) indicates an issue with the idle control system in a vehicle. This code is triggered when the Engine Control Module (ECM) detects that the idle speed control system is not functioning properly. The idle control system is responsible for maintaining a consistent and stable idle speed when the vehicle is at a standstill. When this system malfunctions, it can lead to erratic idle speeds, stalling, or even engine shutdown.

OBDII Code P0505 - Idle Control System Malfunction
P0505 Code - Idle Control System Malfunction

Common Causes of P0505

  1. Faulty idle air control valve
  2. Dirty or clogged throttle body
  3. Vacuum leaks in the intake system
  4. Faulty throttle position sensor
  5. Wiring or electrical issues in the idle control system

Symptoms of P0505

  1. Fluctuating idle speed
  2. Engine stalling at idle
  3. Rough idle
  4. Engine surging
  5. Check Engine Light illuminated

How to Fix P0505

  1. Diagnose the issue by scanning the vehicle's ECM for trouble codes and performing a visual inspection of the idle control system components.
  2. Clean or replace the idle air control valve to ensure proper functioning.
  3. Clean the throttle body to remove any carbon buildup or debris that may be affecting idle speed.
  4. Check for vacuum leaks in the intake system and repair as necessary.
  5. Test the throttle position sensor and replace if faulty.

Cost to Fix P0505

The cost of repairing a P0505 code can vary depending on the specific cause of the issue and the labor rates in your area. On average, the cost of parts for this repair can range from $50 to $200, with labor costs adding an additional $100 to $300. Keep in mind that diagnostic time and labor rates at auto repair shops can vary, so it's best to check with local shops for a more accurate estimate.

What does this mean?

Tech Notes for P0505

















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When is the Code Detected?

The P0505 code is set when the IACV-AAC valve does not operate properly.

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Code P0505 Information for Specific Makes

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.

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