Honda CR-V P0505: Idle Air Control System- Malfunction

P0505 An OBDII Code that addresses the idle air control system within the Honda CR-V.  It’s a generic code, which means that it has the same meaning for the CR-V as it would any other vehicle (CR-V or not).

P0505:  Idle Air Control System:  Malfunction

P0505 triggers when there is either a stuck or clogged idle control valve, as well as a vacuum leak.  However, there are other possible causes.  Although, they aren’t as prevalent.

P0505 Honda CR-V


Índice de Contenido
  1. P0505 Symptoms:  Honda CR-V
  2. CR-V Causes
    1. Valve for Idle Air Control
    2. Vacuum Leak
    3. Carbon Buildup
  3. Conclusion

P0505 Symptoms:  Honda CR-V

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.

Below are some symptoms that P0505 is most commonly seen:

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


CR-V Causes

P0505 will usually indicate a vacuum leakage 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.

Honda CR-V P0505 Diagnosis

Valve for Idle Air Control

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.

It is possible for the IAC to become 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  

You may need to replace your idle air valve if you feel it is time. 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 vehicle by leaking around the throttle and intake leaks.  Here’s a great article from Popular Mechanics on How to spot a vacuum leak.


Carbon Buildup

It is possible for carbon to buildup in the IAC intake area.  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.



You will be able to diagnose P0505 on your CRV.  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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