LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Ford >> 2020 >> Escape Titanium Plug-In Hybrid >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Electric Powertrain Control (2 Of 2) >> Diagnosis And Testing >> Electric Powertrain Control >> Pinpoint Tests >> Pinpoint Test Bu : P0A0A:13
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Pinpoint Test Bu : P0A0A:13

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

    Refer to Charging System for schematic and connector information.

    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 P0A0A:13 High Voltage System Interlock Circuit "A": Circuit Open This DTC sets when a high voltage interlock circuit at the Inverter System Controller (ISC) goes open.

    Possible Sources 

    • Wiring, terminals or connectors
    • Inverter System Controller (ISC)

  2. WARNING: To prevent the risk of high-voltage shock, always follow precisely all warnings and service instructions, including instructions to depower the system. The high-voltage system utilizes approximately 300 volts DC, provided through high-voltage cables to its components and modules. The high-voltage cables and wiring are identified by orange harness tape or orange wire covering. All high-voltage components are marked with high-voltage warning labels with a high-voltage symbol. Failure to follow these instructions may result in serious personal injury or death.
  3. NOTE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

  4. BU1 REVIEW AND RECORD THE INTERLOCK DIAGNOSTIC TROUBLE CODES (DTCS)

    • Ignition ON.

    • Using a scan tool, clear all DTCs.

    • Using a scan tool, perform the Inverter System Controller (ISC) self-test and record the DTCs.

    Is DTC P0A0A:13 present? 

    Yes  GO to  BU3
    No  The concern is not present at this time. The concern may be have been related to prior repair or service that included disconnecting the service disconnect or a high voltage cable.

  5. BU2 INSPECT THE INVERTER SYSTEM CONTROLLER (ISC) CONNECTOR

    • Ignition OFF.

    • Check that the Inverter System Controller (ISC) C199C is fully seated.

    Is the connector fully seated? 

    Yes  GO to  BU3
    No  Repair as necessary. CLEAR the DTCs and REPEAT the self-test.

  6. BU3 CHECK FOR AN OPEN IN THE HIGH VOLTAGE CABLE INTERLOCK STAPLE FOR THE INVERTER SYSTEM CONTROLLER (ISC)

    • Disconnect Inverter System Controller (ISC) C199C.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C199C-2
      GFD472563Courtesy of FORD MOTOR COMPANY
      		 C199C-3

    Is the resistance less than 3 ohms? 

    Yes  GO to  BU4
    No  INSTALL a new (14B322) High Voltage cable assembly.

  7. BU4 CHECK FOR CORRECT INVERTER SYSTEM CONTROLLER (ISC) OPERATION

    • Inspect Inverter System Controller (ISC) C199C interlock pins.

    • For:

      • corrosion
      • damaged or bent pins
      • pushed-out pins

    • Reconnect the Inverter System Controller (ISC) SOBDMC connector. Make sure it seats and latches correctly.

    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  GO to  BU5
    No  The system is operating correctly at this time. The concern may have been caused by module connections. Address the root cause of any connector or pin issues.

  8. BU5 CHECK FOR AN OPEN IN THE HIGH VOLTAGE INTERLOCK STAPLE FOR THE INVERTER SYSTEM CONTROLLER (ISC)

    • Ignition OFF.

    • Remove the Inverter System Controller (ISC) side cover. When removing side cover, pull cover straight out approximately 2 inches before moving upwards or damage to the high voltage interlock connector may occur. REFER to: Inverter System Controller [SOBDMC] .

    • Examine the high voltage interlock connector for damage and loose or broken conditions.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      Inverter System Controller (ISC) side cover pin 1
      GFD472563Courtesy of FORD MOTOR COMPANY
      		 Inverter System Controller (ISC) side cover pin 2

    Is the resistance less than 3 ohms? 

    Yes  GO to  BU6
    No  INSTALL a new Inverter System Controller (ISC) side cover.

  9. BU6 CHECK THE INVERTER SYSTEM CONTROLLER (ISC) SIDE COVER

    • Verify the seal. Check for signs of corrosion.

    • Examine all the high voltage connections for damage and loose or broken conditions.

    • Verify the high voltage terminal bolts are fully seated and torqued to 8 lb.ft (10.5 Nm)

    Is a concern present? 

    Yes  REPAIR as necessary
    No  GO to  BU7

  10. BU7 CHECK FOR INVERTER SYSTEM CONTROLLER (ISC) DIAGNOSTIC TROUBLE CODES (DTCS)

    • Ignition ON.

    • Using a diagnostic scan-tool, clear the DTCs.

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

    Is Inverter System Controller (ISC) DTC P0A0A:13 present? 

    Yes  CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, discontinue this test and follow TSB instructions. If no Technical Service Bulletins (TSBs) 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 concern may have been caused by module connections.
scientia non olet · About LEMON Manuals