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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, 01:56 PM   #1
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Output Driver Modules (ODM) are used by PCM to turn on
current-driven devices needed to control various engine and transaxle
functions. Each ODM can control up to 7 outputs, including EVAP vent
solenoid driver circuit, by supplying ground to device PCM is
commanding on. ODMs can diagnose each circuit individually. If ODM
output (EVAP vent solenoid driver circuit) detects an improper voltage
level, DTC will set.

You likely won't notice any drivability problems.


  • An improper voltage level has been detected on EVAP purge
    solenoid control circuit.

  • Check for shorts or bad connections in EVAP circuit.
  • Replace EVAP purge valve.
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