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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, 01:34 PM   #1
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The Output Driver Module (ODM) is used by the PCM to turn on
many of the current-driven devices that are needed to control various
engine and transaxle functions. Each ODM is capable of controlling up
to 7 separate outputs by applying ground to the device which the PCM
is commanding on. ODM have the capability of diagnosing each output
circuit individually.

You likely won't notice any drivability problems.


  • Improper voltage level detected on output circuit controlling
    EVAP canister vent valve.

  • Check for shorts or bad connections on EVAP
  • Replace EVAP canister vent valve.
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