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Pinpoint Test BZ: P0A94

  1. NOTE: The Inverter System Controller (ISC) is referred to as the SOBDMC (Secondary On-Board Diagnostic Control Module C) in the scan tool.

    Normal Operation and Fault Conditions 

    REFER to: Electric Powertrain Control - System Operation and Component Description .

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    SOBDMC P0A94:00 DC/DC Converter 'A' Performance: No Sub Type Information This DTC sets when an internal issue with inductor current sensor (not serviceable) is detected.

    Possible Causes 

    • Inverter System Controller (ISC) calibration
    • Transmission
    • Inverter System Controller (ISC)

  2. BZ1 CHECK THE INVERTER SYSTEM CONTROLLER (ISC) CALIBRATION LEVEL

    • Verify the Inverter System Controller (ISC) is at the latest calibration level.

    Is the Inverter System Controller (ISC) at the latest calibration level? 

    Yes  GO to  BZ2
    No  UPDATE the Inverter System Controller (ISC) to the latest calibration level.

  3. BZ2 TEST DRIVE THE VEHICLE

    • Clear the Inverter System Controller (ISC) DTC s.

    • Drive the vehicle at speeds above 45 mph and aggressive acceleration in an attempt to duplicate the concern

    • Using a diagnostic scan tool, run the Inverter System Controller (ISC) self-test.

    Is DTC P0A94 present? 

    Yes  If the vehicle exhibits noticeably decreased performance compared to a similarly equipped vehicle or exhibits noticeably increased engine speed flares (different than a similarly equipped vehicle), INSTALL a new transmission, this does not and should not include a new Inverter System Controller (ISC)/SOBDMC. REFER to: Transmission . CLEAR the Inverter System Controller (ISC) DTC s. REPEAT the self-test. If the vehicle performance is comparable to a similarly equipped vehicle, CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new Inverter System Controller (ISC). REFER to: Inverter System Controller [SOBDMC] .
    No  GO to  BZ3

  4. BZ3 CHECK THE VEHICLE SERVICE HISTORY

    • CHECK the vehicle service history for recent service actions related to the Inverter System Controller (ISC).

    Has the Inverter System Controller (ISC) been recently been replaced for DTC s P0A7A:96 or P0A78:96? 

    Yes  INSTALL a new transmission, this does not and should not include a new Inverter System Controller (ISC)/SOBDMC. REFER to: Transmission .
    CLEAR the Inverter System Controller (ISC) DTC s. REPEAT the self-test.
    No  REFER to: Powertrain Control Module (PCM) Input and Output Controls .
    Pinpoint Test Z.
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