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What is OBD code P0505 and how or what do I need to do to fix

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It's a code for a malfunctioning idle air control valve. Buy a new part and replace the defective unit. They cannot be taken apart and cleaned successfully.

Posted on Apr 21, 2014

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2001 maxima engine service light for p505 looking to find out how much would this cost for repair


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 eachother 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. But 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.

Around $200.00 for parts, labor and fees.

Apr 14, 2011 | 2001 Nissan Maxima

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When engine gets hot, idle is up and down with the engine light on. OBD code gives a P0505 code.


per this address "http://www.obd-codes.com/trouble_codes/" p0505 is a "IAC (Idle Air Control) System Malfunction" it gives some good suggestions to look at to find a solution for your problem.

Dec 14, 2010 | 2002 Honda Odyssey

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Check engine light on. The codes are P0420 catalyst efficiency and P0505 idle control system. What do I need to do to fix this??


You need a catalitic converter p0420. Possible iac motor p0505...need to diagnose this recommend dealer

Oct 05, 2010 | 2000 Toyota Camry

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