Question about 2006 Chevrolet Trailblazer Ext

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Got the codes P0506 and P1400 on an 07' 6-cyl trailblazer??? Any ideas?

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

What does that mean?
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.

Posted on May 29, 2010

  • ZJ Limited
    ZJ Limited May 29, 2010

    P1400 - Cold Start Emission Reduction Control System

    2007 GMC Truck Envoy - 2WD | Envoy, Rainier, TrailBlazer, Ascender (VIN S/T) Service Manual | Document ID: 1655997

    DTC P1400 - Diagnostic Instructions
    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    • Diagnostic Procedure Instructions provides an overview of each diagnostic category.

    Circuit/System Description
    The catalytic converter must be warmed to efficiently reduce the emissions. The cold start strategy is to reduce the amount of time it takes to warm the catalytic converter. During a cold start, the engine idle speed is elevated and spark timing is retarded to allow the catalyst to warm quickly. This diagnostic monitors the following to build an exhaust energy model:
    • Engine speed
    • Spark advance
    • Throttle position
    • Engine airflow
    • Engine coolant temperature
    • Engine runtime
    • Park/neutral position
    • Vehicle speed

    The actual model is then compared to the expected exhaust energy model.

    Conditions for Running the DTC
    • A cold start has been detected.
    • The vehicle speed is less than 2 km/h.
    • The engine is at idle with no input from the accelerator pedal.
    • The airflow per cylinder is greater than 80 mg/cylinder.
    • DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0220, P0222, P0223, P0201, P0202, P0203, P0204, P0205, P0206, P0300, P0335, P0336, P0351, P0352, P0353, P0354, P0355, P0356, P0502, P0506, P0507, P0601, P0602, P0603, P0604, P0606, P0607, P062F, P0641, P0651, P1101, P1516, P1682, P2101, P2119, P2120, P2122, P2123, P2125, P2127, P2128, P2135, P2138, P2176, P2610 are not set.
    • This DTC runs for 15 seconds within the first 70 seconds of start up. This diagnostic runs once per trip when a cold start has been determined.

    Conditions for Setting the DTC
    The actual exhaust energy model does not match the expected exhaust energy model.

    Action Taken When the DTC Sets
    • The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
    • The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.

    Conditions for Clearing the MIL/DTC
    • The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
    • A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
    • A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
    • Clear the MIL and the DTC with a scan tool.

    Diagnostic Aids
    Any loading of the engine that lowers engine RPM, such as with partial application of the clutch, during the first 70 seconds of engine run time may set this DTC.

    Circuit/System Verification
    Allow the engine to cool. Monitor the Cold Startup parameter. This should indicate Yes. Start and idle the engine for at least 2 minutes. DTC P1400 should run and pass.

    Circuit/System Testing
    • Inspect the air intake system for the following:
    - If any other DTCs are set, diagnose them first. Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
    - Modified, damaged, or restricted
    - Dirty or deteriorating air filter element
    - Crankcase ventilation system for correct operation--Refer to Crankcase Ventilation System Inspection/Description .
    - Water intrusion
    - Vacuum leak and other un-metered air downstream of the mass air flow (MAF) sensor
    - Intake manifold leak

    • Inspect the exhaust system for the following:
    - Water intrusion
    - Exhaust leak
    - Damaged, restricted, modified or enhanced exhaust system--Refer to Symptoms - Engine Exhaust .

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  • Contributor
  • 9 Answers

Clean the Throttle Body.
Lynn Auto Repair
Jackson,TN

Posted on Jun 11, 2013

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2006 chevy trailblazer 6 cylinder fault code 506,what do i check


506 ? do you mean P0506 ? because there isn't a just 506 code .

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I am getting codes p0403 and code p0506 on my 2001 dodge stratus se 6 cyl 30 what is the best possible solution to a quick fix because i need to pass emissions i have a newborn on the way in 2 weeks help...


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Dealer says code P0506 for my check engine light and that it is caused by air pump emmisions


Just my opinion, but dealer is blowing smoke up there! Clean your throttle body. This is idler control code. It is VERY common for our TB's throttle body to gum up and get clogged with carbon, because we don't have a pcv system. Disconnect the battery, clean the throttle body, best done if you remove the throttle body. You can even re-use the plastic o-ring/gasket many times over. I find that using Seafoam to clean with plastic bristled brush is the best. Seafoam is sensor safe and cost about $9 a can. Look up on the TUBE, there are many videos there showing how to clean a Trailblazer/Envoy throttle body. Very easy and inexpensive. After that's done, clean that throttle body at least once a year. You'll get better gas mileage with it clean.

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1 Answer

Code p0506


Check Engine light Code P0506 Throttle Body Idle Air Control (IAC) System RPM Lower Than Expected, Do not waste your money Solve the problem of code Throtte Body P0506 with three dollars video Part #1 Remove Throttle Body

Oct 23, 2013 | Cars & Trucks

1 Answer

06 chevy trailblazer idle control system RPM lower than expected


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

What does that mean?
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.

Other related DTCs: P0507

Jul 13, 2010 | 2006 Chevrolet Trailblazer

1 Answer

Code P0506


idle control rmp low check air filter pcv valve and fuel pressure from fuel pump

Sep 28, 2009 | 2006 Chevrolet Trailblazer

3 Answers

What does it mean code 300 and code 506. Thank you.


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 is triggered when the PCM detects an engine idle speed that is lower than the desired (pre-programmed) RPM.

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 illuminates. Such as the P0300 which is an indication of multiple misfires to the spark plugs. 

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

Hope this helps, keep me posted if you have any more questions. Be glad to help you get your blazer running 100% again. 

Aug 31, 2009 | 2006 Chevrolet Trailblazer

1 Answer

Idle problem on a 2006 chevy trailblazer 4.2


The code indicates an issue with the Throttle Actuator control. This is a little motor on the throttle body that opens the throttle plates at idle. That control motor may be bad and thus, causing a low idle.

I hope this helps.

Jul 21, 2009 | 2006 Chevrolet Trailblazer

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