Engine-Codes - Toyota - P0505 Toyota

P0505 Toyota Code - Idle Air Control System

- Code Popularity: 156,689 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents
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What are the Possible Causes of the DTC P0505 Toyota?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • 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)

Code Tech Notes

There is a factory service bulletin for the following Toyota vehicles:

2005-2009 Toyota Avalon
2007-2010 Toyota Camry
2008-2009 Toyota Highlander
2006-2009 Toyota RAV4
2007-2010 Toyota Sienna
2009 Toyota Venza
Toyota Factory Service Bulletin OBDII Code P0505





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How to Fix the DTC P0505 Toyota?

Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Search for P0505 Toyota Questions and Answers: Search here →

What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the P0505 Toyota code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Engine hard to start
  • Rough or erratic idle speed

What Does the P0505 Toyota Code Mean?

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.

P0505 Toyota Code - Idle Air Control System

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