AutoCodes – Lexus – P0505 Lexus

P0505 Lexus 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 Lexus 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.

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Code Popularity 29,053

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
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Code P0505 Lexus 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 Lexus - Idle Air Control System - AutoCodes.com — P0505 Lexus Code - Idle Air Control System

What does this mean?

What are the Possible Causes of the DTC P0505 Lexus?

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 Lexus?

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 Lexus 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 Lexus Code

1. What are the common symptoms of OBDII code P0505 in a Lexus related to the Idle Air Control System?

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

2. What are some possible causes of the OBDII code P0505 in a Lexus?

- Common causes include a faulty idle air control valve, a dirty throttle body, vacuum leaks, or issues with the wiring or connectors.

3. How can I diagnose the OBDII code P0505 in my Lexus related to the Idle Air Control System?

- Diagnosis involves checking for vacuum leaks, inspecting the idle air control valve and throttle body, and testing the wiring and connectors for any faults.

4. Can a dirty throttle body cause the OBDII code P0505 in a Lexus?

- Yes, a dirty throttle body can restrict airflow and cause the idle air control system to malfunction, triggering the P0505 code.

5. What are some repair tips for fixing the OBDII code P0505 in a Lexus?

- Cleaning the throttle body, replacing the idle air control valve, checking for vacuum leaks, and ensuring all wiring and connectors are in good condition are common repair steps.

6. Is it safe to continue driving my Lexus with the OBDII code P0505 related to the Idle Air Control System?

- It is not recommended to drive with this code as it can lead to issues with idling and potentially affect the overall performance of the vehicle.

7. Can a DIY enthusiast fix the OBDII code P0505 in a Lexus at home?

- Depending on your experience level, some simple tasks like cleaning the throttle body can be done at home, but diagnosing and replacing components may require professional help.

8. How important is it to address the OBDII code P0505 in a Lexus promptly?

- It is crucial to address this code promptly to prevent potential stalling or starting issues that can impact the drivability and safety of your Lexus.

9. Will resetting the OBDII code P0505 in a Lexus resolve the issue temporarily?

- Resetting the code may temporarily turn off the check engine light, but if the underlying issue is not fixed, the code is likely to reappear.

10. How can I prevent the OBDII code P0505 related to the Idle Air Control System in my Lexus from occurring in the future?

- Regular maintenance, such as cleaning the throttle body and ensuring all components are in good working order, can help prevent the recurrence of the P0505 code.