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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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Old 05-03-2013, 08:43 AM
blanderson blanderson is offline
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Mein Auto: 2003 BMW 330 CI
2003 330 ci

Hello, I have codes p0505 and p0456. I had the icv changed out don't know why I'm getting these two codes. Could someone tell me what this could be and dose it cost a lot of money? Thank you.
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Old 05-03-2013, 11:16 AM
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Mein Auto: 2004 330Ci ZHP 3 pedals
Check the ICV wiring....make sure everything is properly connected and tight.
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Old 05-03-2013, 02:21 PM
blanderson blanderson is offline
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I just got back from a mechanic they said I needed a cvv. He said the icv was good. I had the change the cvv and the hoses and I still have the same code p0505. Please help?
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Old 05-03-2013, 09:07 PM
QAfred QAfred is offline
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Mein Auto: 328i, 330ci, R1200C
OBD Code P0505 refers to the IAC (Idle Air Control) valve which controls the idle speed of the engine. At idle the throttle plate is closed, of course. The IAC is computer controlled and allows only a certain amount of air around the throttle plate. This metered air controls the idle speed. The IAC has a "plunger" or "shutter" that moves to open or close the bypass air passageway. The more air the IAC allows around the throttle plate, the higher the idle. The PCM (Powertrain Control Module) uses the IAC valve to keep the idle speed correct with varying engine demands. Can be a three or four wire sensor depending on the model. The PCM monitors voltages of the IAC circuits and if it detects an incorrect voltage on one or more of the IAC motor circuits it will set P0505. NOTE: Problems with the IAC would only be noticeable at idle or when throttle is closed.

Symptoms should include: MIL illumination / Engine stalls and may not idle unless the throttle is depressed and/or intermittently stalls when letting off the throttle or the engine may idle too high

Potential causes include: IAC motor connector is damaged (check connector and pins for damage, and moisture) One or more IAC circuits are open or shorted to ground or one or more IAC circuits are shorted to voltage - IAC has failed or PCM has failed .


This should be a fairly straightforward diagnosis. Start by clearing the fault codes. Then unplug the IAC and start the engine (This may cause other IAC codes to set. Just ignore them for now). If the P0505 code doesn't reset, replace the IAC. It is internally shorting one of the IAC circuits. If the code DOES return after unplugging the IAC and starting the engine, then you know it isn't the IAC motor.

Visually check the wiring harness all the way back to the PCM. You may need to visually inspect the harness by removing all the insulation off the wires. It is possible that the wires could be shorting to each other or to other wires in the harness. If there are no wiring problems, and the code keeps returning with the IAC unplugged, you can check the PCM by removing the IAC wires from the PCM connector (or clipping the wires in a location where they can be repaired easily) and then start the engine (If you're not sure, don't do it. Take it to a qualified professional).

Now if the code doesn't reset there is a problem with the wiring. Check for continuity on all the IAC wires. Any resistance points to a problem. Check for voltage on any(At this point there shouldn't be any voltages on the wires because they're clipped at one end and unplugged at the IAC). Repair as necessary.

If the P0505 code DOES reset after removing the IAC wires from the PCM connector(or clipping them), replace the PCM, there's a problem internally on the IAC control circuit.

Last edited by QAfred; 05-03-2013 at 09:17 PM.
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