Toyota Camry P0505: Idle Air Control System- Failure

P0505 This OBDII code deals with the idle control system of the Toyota Camry.  It’s a generic code, which means that it has the same meaning for the Camry as it would any other vehicle (Camry or not).

P0505:  Idle Air Control System:  Malfunction

P0505 usually occurs due to a stuck idle valve, a blocked idle valve control valve, or an unattended vacuum leak.  Other causes can also be involved.  Although, they aren’t as prevalent.

P0505 Toyota Camry


Índice de Contenido
  1. P0505 Symptoms:  Toyota Camry
  2. Camry P0505 Causes
    1. Valve to control the idle airflow
    2. Vacuum Leak
    3. Carbon Buildup
  3. Conclusion

P0505 Symptoms:  Toyota Camry

This particular trouble code lets you know that there is something wrong with the idle air control system, but that’s about it.  The symptoms may vary.

These are the top symptoms of P0505.

  • Soon, Service engine light
  • It is a rough idle
  • Stalling
  • Very high idle speed 


Camry P0505 Causes

P0505 can usually be caused either by a vacuum leak or a problem in the idle air valve.  While replacing the idle air control valve seems like a good idea, it’s worth your time to check for a Leakage of vacuum first.

Toyota Camry P0505 Diagnosis

Valve to control the idle airflow

The idle air control valve’s primary job is to regulate the idle speed of your engine.  The idle air control valve regulates the engine's idle speed by controlling the amount of air that is allowed in.

You can either get the IAC valve stuck or dirty.  The IAC valve may require a replacement or cleaning may suffice.  Here’s a great Video from YouTube How to clean an idle air control valve  

They are available if you decide that an idle valve control valve is needed. It is very affordable.


Vacuum Leak

While the idle air control valve is often the cause of P0505, it’s a great idea to start diagnosing it by looking for a vacuum leak.  Check the vacuum tubes surrounding the IAC.  It may be necessary to replace them if they appear cracked or dry-rotted.

You can code your Camry with leaks in the intake and around the throttle bodies.  Here’s a great article from Popular Mechanics on How to locate a vacuum leak.


Carbon Buildup

Carbon buildup can occur around the IAC's inlet.  It is possible to fix this problem by checking the IAC inlet area for blocked passages.

The throttle body can become too dirty to allow air to enter the engine.  You can even throw P0505.  Often, when this is the case, you’ll feel the engine stall for a second before it recovers when slowing down.  

This happens because the engine can’t adjust to this problem fast enough.  It is possible to fix the problem by cleaning it from around the throttle blades.



It's possible to identify P0505 within your Camry.  Most of the time it’s a vacuum leak or the idle air control valve.  If you feel like there’s anything that you can add, please feel free to leave a comment below.

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