Question about 2005 Dodge Grand Caravan

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1996 Dodge Grand Caravan 3.3 shows trouble code P0505 Idle Control System Malfunction. What is the best fix for this problem as the vehicle needs to pass smog. Thanks for your assistance!

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Sometimes that code is generated when the charging voltage from the charging circuit is too low and the minimum airflow spec gets lost by the pcm. This can be a bad alternator, battery etc. As well if someone has adjusted the set screw in the throttle body trying to fix the code then I'd suggest retesting with a used throttle body. As well one last thing the intake gaskets/plenum pan on those engines blow out and cause a vaccum leak that can cause spark knock and oil consumption. If that vaccum leak was large enough it could cause your low vaccum reading and that code. As always check the accuracy of the map sensor and tps when dealing with idle speed issues

Posted on Jul 14, 2010

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