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Pinpoint Test U: P0A3C:94

WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
  1. Normal Operation and Fault Conditions 

    REFER to: Electric Powertrain Control - Component Location .

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    SOBDMC P0A3C:94 Drive Motor "A" Inverter Over Temperature: Unexpected Operation This DTC sets when the module senses an elevated internal temperature

    Possible Sources 

    • Wiring, terminals or connectors
    • Electric powertrain cooling concern
    • Temperature sensor
    • Inverter System Controller (ISC)

  2. U1 CHECK THE COOLING FAN OPERATION

    NOTE: Verify cooling fan operation before proceeding with this test

    • Verify the cooling fan operates.

    Does the cooling fan operate? 

    Yes  GO to  U2
    No  REFER to: Electric Powertrain Cooling - Overview .

  3. U2 CHECK THE COOLANT LEVEL

    • Inspect the coolant.

    Is the coolant at the correct level? 

    Yes  GO to  U3
    No  REFER to: Cooling System Filling and Bleeding .

  4. U3 INSPECT THE COOLANT FOR CONTAMINATION

    • Inspect the coolant.

    Is the coolant contaminated? 

    Yes  REFER to: Cooling System Filling and Bleeding .
    No  GO to  U4

  5. U4 INSPECT THE RADIATOR

    • Inspect the radiator for any obstruction.

    Is the radiator obstructed? 

    Yes  REPAIR as necessary.
    No  GO to  U5

  6. U5 INSPECT THE MOTOR ELECTRONICS COOLING SYSTEM HOSES

    • Inspect the motor electronics cooling system hoses.

    Is a concern present? 

    Yes  REPAIR as necessary.
    No  GO to  U6

  7. U6 INSPECT FOR INTERNAL AND EXTERNAL COOLANT LEAKS

    • Inspect the coolant system for leaks.

    Are any leaks present? 

    Yes  REPAIR as necessary.
    No  GO to  U7

  8. U7 PERFORM THE BECM (BATTERY ENERGY CONTROL MODULE) SELF-TEST

    • Ignition ON.

    • Access the BECM and control the COOL_PMP_B_CMD (%) PID

    • Using the scan tool, active command the coolant pump to 100% for 5 minutes. Confirm if the affected coolant pump (the Motor Electronics Coolant Pump) is running by feeling the pump for vibration.

    • Using a diagnostic scan tool, perform the BECM self-test.

    Is DTC P0A06:00, P0A07:00, P0C73:00, P2D00:00, P2D01:00, P2D02:00, P2D03:00, and/or P2D04:00 present OR is the affected coolant pump inoperative? 

    Yes  DIAGNOSE the BECM DTC's. REFER to: High Voltage Battery, Mounting and Cables .
    No  GO to  U8

  9. U8 CHECK FOR INVERTER SYSTEM CONTROLLER (ISC) TEMPERATURE SENSOR CORRELATION

    • Cold soak the vehicle at ambient temperature for at least 6 hours.

    • Ignition ON.

    • Access the SOBDMC and monitor the G_PHTMP (Deg C) PID

    • Road test the vehicle while monitoring the PID.

    Does the temperature PID indicate greater than 115 deg.C (239 deg.F)? 

    Yes  REFER to: Electric Powertrain Cooling .
    No  GO to  U9

  10. U9 CHECK FOR CORRECT INVERTER SYSTEM CONTROLLER (ISC) OPERATION

    • Ignition OFF.

    • Disconnect and inspect all Inverter System Controller (ISC) connectors.

    • Repair:

      • corrosion (install new connector or terminals - clean module pins)
      • damaged or bent pins - install new terminals/pins
      • pushed-out pins - install new pins as necessary

    • Reconnect the Inverter System Controller (ISC) connectors. Make sure they seat and latch correctly.

    • Ignition ON.

    • Clear the Inverter System Controller (ISC) DTCs.

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

    Is DTC P0A3C present? 

    Yes  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  The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.
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