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Pinpoint Test T: P0A40, P0A4C

  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 P0A40:00 Drive Motor 'A' Position Sensor Circuit Range/Performance: No Sub Type Information This DTC sets when an intermittent resolver wiring concern is detected.
    SOBDMC P0A4C:00 Generator Position Sensor Circuit Range/Performance: No Sub Type Information This DTC sets when an error is detected with the position reading's rationality check.

    Possible Causes 

    • Inverter System Controller (ISC)

  2. T1 CHECK FOR INVERTER SYSTEM CONTROLLER (ISC) DIAGNOSTIC TROUBLE CODES (DTCS)

    NOTE: Wiring overlays or repinning of circuits are NOT appropriate for DTCs P0A40 or P0A4C due to risk of hardware damage.

    • Ignition ON.

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

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

    Are DTC s P0A40 or P0A4C the only DTC s present? 

    Yes  GO to  T2
    No  DIAGNOSE all other Inverter System Controller (ISC) DTC s. REFER to the DTC chart in This Service Information.

  3. T2 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  T4
    No  UPDATE the Inverter System Controller (ISC) to the latest calibration level. GO to  T3

  4. T3 TEST DRIVE VEHICLE

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

    • Test drive the vehicle, accelerate and decelerate quickly.

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

    Are DTC s P0A40 or P0A4C present? 

    Yes  GO to  T4
    No  The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

  5. T4 CHECK FOR APPLICABLE SERVICE ARTICLES

    • CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA.

    Was a service article found? 

    Yes  DISCONTINUE this test and FOLLOW the service article instructions.
    No  If DTC s P0A40 or P0A4C are the only DTC s present, INSTALL a new Inverter System Controller (ISC). REFER to: Inverter System Controller [SOBDMC] .
    If DTC s P0A40 or P0A4C are not the only DTC s present, DIAGNOSE all other Inverter System Controller (ISC) DTC s. REFER to the DTC chart in This Service Information.
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