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Code p0505 check engine light on wont start right up

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I have a 98 Mazda 626, error codes p0420 and p0505, anything that could cause both?


P0505 - Idle Control System Malfunction P0420 - Catalyst System Efficiency Below Threshold (Bank 1)

Apr 22, 2014 | 1999 Mazda 626

1 Answer

Engine surgeing and wont go over 3000 rpm


TDC sensor bad or wire to it mangled.
http://honda-tech.com/tags.php?tag=p1362

505 is (bad idle)
http://honda-tech.com/tags.php?tag=p0505

TDC is big time bad, idle speeds are the last to work right
on any EFI engine... its a side show.

Jan 09, 2014 | 2000 Honda Accord

1 Answer

Check engine light on and was reading a p0505 code drove to the store and engine like started blinking got home hooked the code reader and now have another code of p0309 and p1399


Code 505 is a problem with the idle air control valve.
Code 309 is noting a cylinder 9 missfire on engines with 10 cylinders which would not include yours. That may be a fluke or not the right number.
Code p1399 is brand specific and for Honda it usually means random miss.
The code 505 could be the idle control valve or a vac leak. The computer can not control idle speed by using the valve.
The miss codes mean the cylinders are not producing power when they should be. Which may or may not be ignition. It could also be fuel or mechanical problems.
If you have not replaced the plugs and done the usual maintenance stuff in the past year or two, I would start with the basics.
Be sure and look at the inside of the dist cap and rotor.

Jan 18, 2013 | 1998 Honda Civic

1 Answer

2000 honda accord ex with code p0505


For a 2000 Honda Accord LX, the check engine code P1456 simply means that your gas cap is off or isn't tight enough. It wont go off immediately. It make take up to a weak for the check engine light to turn off once the gas cap is tightened enough.-------------------------------------------------------------------------------------
Renault CAN Clip

Dec 10, 2012 | Cars & Trucks

1 Answer

1999 dodge durango 5.2l code po505


P0505 - Idle Control System Malfunctionxicon.jpghttp://engine-codes.com/p0505.htmlForum CodePossible causes- IACV-AAC valve harness is open or shorted
- IACV-AAC valve poor electrical connection
- Faulty IACV-AAC valve

Read more: http://engine-codes.com/p0505.html#ixzz1zVJIt34L

Jul 02, 2012 | 1999 Dodge Durango

2 Answers

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

1 Answer

Vehicle idle very low code p0505 said idle system control problem what part can b bad and check engine light is on


Causes: Potential causes of an P0505 code include:
* IAC motor connector is damaged (check connector and pins for damage, and moisture)
* One or more IAC circuits open or shorted to ground
* One or more IAC circuits are shorted to voltage
* IAC has failed
* PCM has failed

Possible Solutions:
* 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.

Hope helps (remember to rate and comment this).

Dec 24, 2010 | 2000 Chevrolet Prizm

3 Answers

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

2 Answers

2001 Toyota Sequoia is showing a P0505 and PO420 error code; how do you correct these issues.


P0505 Idle Control System Malfunction

IACV or Idle Air Control Valve if equipped is malfunctioning.

P0420 Catalyst System Efficiency Below Threshold (Bank #1)
The Catalytic converter is not working up to par in Bank#1.

I think this will point you in the right direction..



Jul 16, 2010 | 2001 Toyota Sequoia

1 Answer

Engine Code P0505


After the IAC is replaced it is not enough to clear the code you must also reset the IAC learned adaptive. To do this you will need a higher end scanner like snap-on or such.

Apr 18, 2009 | Dodge Durango Cars & Trucks

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