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    Thread: 06 Jetta 2.5l with code P0507- idles funny

    1. Member nitrodub16's Avatar
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      06 jetta 2.5, 86 jetta 1.8, 69 karmann ghia
      02-24-2011 11:18 AM #1
      I recently purchased an 06 Jetta 61k 5 speed and there is a P0507 code for high idle issue. I noticed the rpm's not dropping, sometimes staying around 2-3k rpm when pushing clutch in while driving. Also the idle will float around 1,200 rpm and eventually dropping to 700. I can feel the vehicle holding rpm when leaving off the accelerator and suddenly letting go. Anyone have same issue or know of what I can check or replace? Any help would be greatly appreciated

    2. Member thygreyt's Avatar
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      02-24-2011 02:26 PM #2
      from here, http://www.obd-codes.com/p0507
      after a google search:

      Quote Originally Posted by http://www.obd-codes.com/p0507
      P0507 - Idle Air Control System RPM Higher Than Expected

      OBD-II Trouble Code Technical Description

      Idle Air Control (IAC) System RPM Higher Than Expected

      What does that mean?

      This P0507 code is one that's sometimes triggered on vehicles that have electronic throttle control. That is, they don't have a regular throttle cable from the accelerator pedal to the engine. They rely on sensors and electronics to control the throttle. In this case, the P0507 DTC (diagnostic trouble code) is triggered when the PCM (powertrain control module) detects an engine idle speed that is greater than the desired (pre-programmed) RPM. In the case of GM vehicles (and possibly others) if the idle speed is over 200 rpm higher than expected, this code will be set.

      Potential Symptoms

      Most likely you'll notice the idle speed is higher than normal. There are potentially other symptoms as well. Of course, when trouble codes are set, the MIL (malfunction indicator lamp, a.k.a. the check engine light) illuminates.

      Causes

      A P0507 DTC trouble code may be caused by one or more of the following:

      A vacuum leak
      Leaking air intake after the throttle body
      EGR valve leaking vacuum
      A faulty positive crankcase ventilation (PCV) valve
      Damaged/failed/dirty throttle body
      Failed EVAP system
      Failed IAC (idle air controller) or faulty IAC circuit
      Possible Solutions

      This DTC is more of an informational code, so if there are any other codes set, diagnose them first. If there are no other codes, inspect the intake air system for air or vacuum leaks and damage. If there are no symptoms other than the DTC itself, just clear the code and see whether it returns.

      If you have an advanced scan tool that can interact with the car, command the idle higher and lower to see if the engine responds appropriately. Also check the PCV valve to see if it's blocked and needs to be replaced. Check the IAC (idle air controller) if equipped, verify it's operation. If available, try swapping in a new throttle body to see if that fixes the problem. On Nissan Altimas and possibly other vehicles the problem may be fixed by having the dealer perform an idle air relearn procedure, or other relearn procedure
      just a note: we dont have an IAC.

    3. Member nitrodub16's Avatar
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      02-24-2011 04:25 PM #3
      wow fantastic info, thanks so much I think this will get me going in the right direction. I did move the idle up and down w/ VAG-COM and it responded fine. I'm thinking its a vac leak somewhere. Thanks again thygreyt

    4. Member thygreyt's Avatar
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      02-24-2011 06:15 PM #4
      if you run into any other issues, just post back.

      hopefully that will help you solve the problem

    5. 03-13-2011 11:04 AM #5
      My 06 2.5 threw that code a while back, and it ended up being the crankcase ventilation (PCV) valve. It's integral to the valve cover, so the entire cover gets replaced.

    6. Member thygreyt's Avatar
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      03-13-2011 04:25 PM #6
      great! thanks for sharing..!

    7. Member
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      2007 Jetta 2.5 Wolfsburg Edition
      03-13-2011 08:55 PM #7
      our cars also have "Rev Hang" also, I thought something was wrong with my car too, i bought it a month ago 2007 Jetta 2.5l 5 speed with 49k, then as i did some research it was "rev hang", but i'm getting a chip soon so that will be gone soon

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