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Fix code 506 - 2005 GMC Canyon

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Po 506 computer detects idle is to low.may have bad idle air control valve or needs cleaning,also make sure throttle body is clean.

Posted on Sep 30, 2009

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Code 506 means the engine computer can not maintain normal engine RPM at idle. Could be a problem with the idle air control valve, or something else.

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I am getting codes PO 128, PO 300 and PO 506 on my chevy Impala, 2002, LS 3.8


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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. 

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