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OBD-II Trouble Shooting Got a code reader? Find out what your GM car's Check Engine light is trying to tell you (and then turn Check Engine light off).

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Old 09-27-2009, 02:58 PM   #1
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Default P0405



PCM monitors EGR valve pintle position input to ensure that
valve responds properly to commands from PCM and to detect a fault if
pintle position sensor circuit is open or shorted. If PCM detects an
excessively low EGR feedback signal voltage, DTC will set.

You likely won't notice any drivability problems.

  • EGR feedback is less than .14 volt at anytime.

Possible Solutions
  • Check for poor terminal connections at EGR valve.
  • Check for excessive deposits on EGR valve pintle or seat.
  • Replace EGR
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