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05 Subaru Imprezza gives code p0506, car is idling very low. It has stalled a few times, is it most likely a vacuum leak, or what are items on a first check list I should look at.I realize it could be maybe worst case internal engine problem but want to rule out simpler things first. I am going to start looking for possible vacuum leaks. Thanks Bob

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Posted on Dec 21, 2008

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emissionwiz
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SOURCE: Need to reset check engine light on 2002 Subaru Imprezza 2.5

1st u need to know if the check engine light comes on there is a fault present, you need to have the system computer tested to get the fault code that is set with the check engine light illumination. the system in your car is very sophisticated and has the ability to work round most system problems, this means u will feel no diff in the way the car runs, u can reset the light by just disconnecting the battery negative for 5 min's, but the light will come back on if the fault is still present.

Posted on May 06, 2009

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2002 forester CEL on (EVAP Leak) and stalling at start?


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Code p0506 subaru after disconnecting battery


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P0506


P0506 - Idle Air Control (IAC) System RPM Lower Than Expected

This P0506 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 P0506 DTC (diagnostic trouble code) is triggered when the PCM (powertrain control module) detects an engine idle speed that is lower than the desired (pre-programmed) RPM.
Potential Symptoms Most likely the only thing you'll notice is the idle speed is lower than normal so it will likely be rougher. 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 P0506 DTC trouble code may be caused by one or more of the following:
  • A vacuum leak
  • An air restriction in the intake air path or exhuast
  • A faulty positive crankcase ventilation (PCV) valve
  • Damaged/failed/dirty throttle body
  • Internal engine problem
  • Failed PCM
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 for vacuum leaks, restrictions, and damage. If there are no symptoms other than the DTC itself, just clear the code and see whether it returns.

Jun 20, 2011 | 2001 Saturn L-Series

1 Answer

P0506 on 2003 expedtion


P0506 - Idle Air Control (IAC) System RPM Lower Than Expected

This P0506 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 P0506 DTC (diagnostic trouble code) is triggered when the PCM (powertrain control module) detects an engine idle speed that is lower than the desired (pre-programmed) RPM.

Potential Symptoms: Most likely the only thing you'll notice is the idle speed is lower than normal so it will likely be rougher. 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 P0506 DTC trouble code may be caused by one or more of the following:
* A vacuum leak
* An air restriction in the intake air path or exhuast
* A faulty positive crankcase ventilation (PCV) valve
* Damaged/failed/dirty throttle body
* Internal engine problem
* Failed PCM

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 for vacuum leaks, restrictions, and damage. If there are no symptoms other than the DTC itself, just clear the code and see whether it returns.

Hope helps.

Jul 31, 2010 | 2003 Ford Expedition

2 Answers

Code po506 shows up how do i fix it


This P0506 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 P0506 DTC (diagnostic trouble code) is triggered when the PCM (powertrain control module) detects an engine idle speed that is lower than the desired (pre-programmed) RPM.
Causes:
A P0506 DTC trouble code may be caused by one or more of the following:
· A vacuum leak
· An air restriction in the intake
·
· air path or exhaust
· A faulty positive crankcase ventilation (PCV) valve
· Damaged/failed/dirty throttle body
· Internal engine problem
· Failed PCM

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 for vacuum leaks, restrictions, and damage. If there are no symptoms other than the DTC itself, just clear the code and see whether it returns

Nov 21, 2009 | 2004 GMC Canyon

1 Answer

2006 Canyon 4cyl has extremely low idle. Autozone Diagnostics gives code:P0506. Idles low if at all.


Could be:
  • A vacuum leak
  • An air restriction in the intake air path or exhuast
  • A faulty positive crankcase ventilation (PCV) valve
  • Damaged/failed/dirty throttle body
  • Internal engine problem
  • Failed PCM (powertrain control module)
I say back to the shop if its a real problem, if at all to just clear the code to see if it comes back. That code is just an informational code. Just says what the car is doing :\ . My first guess would be a vacuum leak somewhere followed by a throttle body issue.

Sep 15, 2009 | 2006 GMC Canyon

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