AutoCodes – Toyota – P0505 2018 Toyota RAV4

P0505 2018 Toyota RAV4 Code - Idle Air Control System

Quick Answer

The idle speed is controlled by the Electronic Throttle Control System (ETCS). Common causes include Dirty Throttle Body, Faulty Electronic Throttle Control System (ETCS) (Throttle Body), Electronic Throttle Control System harness is open or shorted. 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 2018 Toyota RAV4 indicates Idle Air Control System.
Common causes: Common causes include Dirty Throttle Body, Faulty Electronic Throttle Control System (ETCS) (Throttle Body), Electronic Throttle Control System harness is open or shorted.
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.

Save to My Repairs Step-by-Step Diagnostic Guide My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 632

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 01, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P0505 2018 Toyota RAV4 Description

The idle speed is controlled by the Electronic Throttle Control System (ETCS). The ETCS is comprised of 1) the one valve type throttle body; 2) the throttle actuator, which operates the throttle valve; 3) the throttle position sensor, which detects the opening angle of the throttle valve; 4) the accelerator pedal position sensor, which detects the accelerator pedal position; and 5) the Engine Control Module (ECM), which controls the ETCS. Based on the target idle speed, the ECM controls the throttle actuator to provide the proper throttle valve opening angle.
The ECM monitors the idle speed and idling airflow volume to conduct Idle Speed Control (ISC). The ECM determines that the ISC system is malfunctioning if the Idle speed continues to vary greatly from the target idle speed.

OBDII Code P0505 2018 Toyota RAV4 - Idle Air Control System - AutoCodes.com — P0505 2018 Toyota RAV4 Code - Idle Air Control System

What does this mean?

What are the Possible Causes of the DTC P0505 2018 Toyota RAV4?

Dirty Throttle Body
Faulty Electronic Throttle Control System (ETCS) (Throttle Body)
Electronic Throttle Control System harness is open or shorted
Electronic Throttle Control System circuit poor electrical connection
Air Induction System (Intake leak)
PCV hose connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0505 2018 Toyota RAV4?

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 2018 Toyota RAV4 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.

Need more information about the P0505 2018 Toyota RAV4 code?

Need more information on how to fix the P0505 2018 Toyota RAV4 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0505 2018 Toyota RAV4 code diagnosed by a professional: Find a repair shop in your area

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 2018 Toyota RAV4 Code

1. What does OBDII code P0505 indicate in a 2018 Toyota RAV4?

P0505 indicates a malfunction in the Idle Air Control (IAC) system of the vehicle.

2. What are the common symptoms of a P0505 code in a 2018 Toyota RAV4?

Common symptoms include erratic idling, stalling at idle, and potential difficulty starting the vehicle.

3. What are the possible causes of a P0505 code in a 2018 Toyota RAV4?

Potential causes include a faulty IAC valve, carbon buildup in the throttle body, vacuum leaks, or issues with the wiring or connectors.

4. How can I diagnose the source of a P0505 code in my 2018 Toyota RAV4?

Diagnosis typically involves checking the IAC valve for proper operation, inspecting the throttle body for carbon buildup, and testing for vacuum leaks using a smoke machine.

5. Can a P0505 code be fixed at home, or is professional repair recommended for a 2018 Toyota RAV4?

Simple cases like cleaning the throttle body or replacing a faulty IAC valve can be done at home, but more complex issues may require professional diagnosis and repair.

6. Is it safe to continue driving my 2018 Toyota RAV4 with a P0505 code?

It is generally not recommended to drive with a P0505 code as it can lead to further engine performance issues and potential safety concerns.

7. Will resetting the OBDII system clear the P0505 code in a 2018 Toyota RAV4?

Resetting the system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear.

8. How much does it typically cost to repair a P0505 code in a 2018 Toyota RAV4?

The cost of repair can vary depending on the exact cause of the issue, but it can range from a simple DIY fix to a few hundred dollars for professional diagnosis and repair.

9. Can a P0505 code affect the fuel efficiency of a 2018 Toyota RAV4?

Yes, a malfunctioning IAC system can impact fuel efficiency as it may lead to improper air-fuel mixture and engine performance.

10. How often does the Idle Air Control system need maintenance in a 2018 Toyota RAV4?

Regular maintenance of the IAC system, including cleaning the throttle body and checking for vacuum leaks, can help prevent issues like the P0505 code from occurring.