p0505 error... after fender bender... hissing noise in front bumper area - Jeep Garage - Jeep Forum

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Old 04-24-2017, 01:48 PM
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p0505 error... after fender bender... hissing noise in front bumper area

I have a "new to me" 2000 Grand Cherokee - 113K miles -that I purchased form an auction - it had front passenger fender/bumper damage... According to carfax - it just passed emissions at 106Kmiles (about a year ago - so obviously no CEL) It currently has a CEL - p0505 code ... Idles fine and pretty smooth (about 700-800rmp), starts fine but I can occasionally get it to drop to very low even to a stall idle if I "bump" the gas and let off quick... not driving but just parked... One other note - I seem to hear a hissing /sucking behind passenger headlamp/bumper - in the area of the vacuum Reservoir

Questions:
1) If the Vacuum Reservoir was damaged - or has a leak would it cause a p0505 error?

2) if I replace the IAC with a new one or even clean my current one (battery disconnected) - should check engine light go away immediately if that is indeed the problem? Or do I need to reset something (other than clear the code with a obdII scanner.)

Thanks

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Old 04-24-2017, 03:36 PM
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Re: p0505 error... after fender bender... hissing noise in front bumper area

The P0505 code is set when the PCM sees voltage signals from the IAC which are not within the normal limits. The problem can be the IAC stepper motor itself, wiring or the PCM.
Disconnect the IAC connector, reset the fault code and start the engine. If the fault code doesn´t appear, then the IAC is the problem. If the code still appears, then the problem is with the wiring or the PCM.
A vacuum leak at the vacuum reservoir should not cause this fault code, but it could influence the IAC. So stop off the vacuum supply line to the reservoir and see what happens.
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Old 04-24-2017, 04:12 PM
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Re: p0505 error... after fender bender... hissing noise in front bumper area

Thanks Frank,

I did do that diagnostic originally (unplugged IAC, cleared the code then started it up) and the CEL was off for the next 3 or 4 times I drove it - and I thought "cool its just the IAC" - then on my way to buy a new IAC the CEL returned.... p0505! I also cleaned my original IAC and have tried an additional "used" one. Leading to my last question ... if it was solely the IAC motor itself - would a new one immediately keep the check engine light from returning or is there a "reprogramming / memory" issue that would cause it to falsely keep the CEL on?
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Old 04-24-2017, 11:04 PM
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So I found my vacuum leak... Looks like this side hose that comes off the vacuum reseviour t -connection broke the nipple off this plastic piece...(see the hole) Anyone know what that component is called? This is directly behind the passenger headlight ! Underneath the battery. Thanks
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Old 04-24-2017, 11:07 PM
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Here's an additional pic for reference... What is that component?
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Old 04-25-2017, 06:47 AM
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Re: p0505 error... after fender bender... hissing noise in front bumper area

Cruise control servo.........

Mopar Chrysler Dodge Eagle Plymouth Cruise Control Servo Speed Control # 4669977 | eBay

I am pretty sure you can repair yours with a nipple.
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Old 04-29-2017, 01:03 PM
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So I fixed the broken nipple..ie the vacuum leak at that connection. And I also replaced the IAC with a new one... Clear the check engine light.. Start it up... Light comes back on... P0505. And cruise control still not working... If I turn the truck off. Rest code and unplug (the now new) IAC start up the truck... The CEL stays off... At least for the 2 more times I drove it but how long that will stay off not sure... As I Did this same procedure with the original IAC And the CEL eventually came back on even with IAC unplugged... But maybe that's normal if you leave an IAC unplugged for that long... And the light will come back on immediately when I plug the IAC back in...

So... According to the web if you clear the code and unplug the IAC and the CEL stays off it's the IAC motor... But this one is brand new. I guess there could still be a vacuum leak... Since cruise doesn't work... I've also read on a few other thread that the computer takes some time to re learn the new IAC... So is it possible I just need to drive this around for a bit and the CEL will go off? I didn't disconnect battery when replacing new IAC... if that matters.

Any advice on how to narrow this down? Hoping it's not the PCM...

Thanks
John
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Old 04-30-2017, 08:43 AM
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Re: p0505 error... after fender bender... hissing noise in front bumper area

I would try a battery reset first. The PCM doesn´t know that you changed the IAC and will keep the previous settings in its memory. Resetting the battery, then the PCM looses its memory and the IAC settings will be lost. As soon as you connect the battery again, the PCM will move the IAC from full open to full close, so that it reckognizes this positions. It can take some starts for the PCM to relearn the idle setting.
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Old 04-30-2017, 07:42 PM
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Thanks... I disconnected the battery overnight and started it up... No check engine light... Idles around 700... Yeah! Drove it around the neighborhood... Stayed off... Came home turned it off... Started it again... Check engine light...p0505... Doh! So when you say it might take a few starts... Is that what your referring to? Should i just drove it this week and see if it clears. I appreciate your help.
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Old 04-30-2017, 08:31 PM
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Re: p0505 error... after fender bender... hissing noise in front bumper area

No, the relearn period is for the idle setting. I would measure the wires between the PCM and the IAC for continuity and short to ground. Do this, while fiddling with the wires, so that an eventual internal wire break can be discovered. Also check if the wire insulation is not damaged at any spot, especially where the bundle contacts metal parts.
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Old 05-18-2017, 10:37 AM
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Re: p0505 error... after fender bender... hissing noise in front bumper area

So - checked all wires - which were fine... ordered a pcm... no more p0505... So, from what I've read elsewhere also, I think if you have a persistent p0505 you can pretty much bet you need a new PCM.

Thanks for all the help.
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Old 05-18-2017, 01:09 PM
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Re: p0505 error... after fender bender... hissing noise in front bumper area

Good to hear its solved, happy jeeping.
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