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Pinpoint Test AH - DTC: U0100:00

WARNING: This page is about a different car, the 2020 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

Normal Operation and Fault Conditions 

The OCSM and RCM both use information contained in messages from the PCM sent on the HS-CAN.

DTC Fault Trigger Conditions 

DTC Description Fault Trigger Conditions
U0100:00 Lost Communication with ECM/PCM "A": No Sub Type Information This DTC sets if the OCSM does not receive an expected message from the PCM.
U0100:00 Lost Communication with ECM/PCM "A": No Sub Type Information This DTC sets if the RCM does not receive an expected message from the PCM.

Possible Causes 

PINPOINT TEST A : U0100:00 

  1. NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test.
  2. NOTE: Only disconnect or reconnect SRS components when instructed to do so within a pinpoint test step. Failure to follow this instruction may result in incorrect diagnosis of the SRS.
  3. NOTE: Always make sure the correct SRS component is being installed. Parts released for other vehicles may not be compatible even if they appear physically similar. Check the part number listed in the Ford parts catalog to make sure the correct component is being installed. If an incorrect SRS component is installed, Diagnostic Trouble Codes (DTCs) may set.

  4. A1 VERIFY DIAGNOSTIC SCAN TOOL COMMUNICATION WITH THE PCM (POWERTRAIN CONTROL MODULE)

    WARNING: Before beginning any service procedure, refer to Safety Warnings. Failure to follow this instruction may result in serious personal injury.

    • Ignition ON.

    • Connect the diagnostic scan tool.

    • Check that a vehicle session can be established using the diagnostic scan tool.

    Can a vehicle session be established? 

    Yes  If DTC U0100:00 was retrieved from the OCSM, GO to  A2 If DTC U0100:00 was retrieved from the RCM, GO to  A3
    No  To diagnose no communication with the PCM, REFER to: Communications Network .

  5. A2 CHECK THE OCSM (OCCUPANT CLASSIFICATION SYSTEM MODULE) CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODES (CM DTCS)

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

    • Using a diagnostic scan tool, clear OCSM Diagnostic Trouble Codes (DTCs).

    • Wait 10 seconds.

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

    Is DTC U0100:00 retrieved again? 

    Yes  GO to  A4
    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.

  6. A3 CHECK THE RCM (RESTRAINTS CONTROL MODULE) CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODES (CM DTCS)

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

    • Using a diagnostic scan tool, clear RCM Diagnostic Trouble Codes (DTCs).

    • Wait 10 seconds.

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

    Is DTC U0100:00 retrieved again? 

    Yes  GO to  A4
    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.

  7. A4 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE PCM (POWERTRAIN CONTROL MODULE) KOEO (KEY ON, ENGINE OFF) SELF-TEST

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

    • Check for recorded Diagnostic Trouble Codes (DTCs) from the PCMKOEO self-test.

    Is DTC P0562 or P0563 recorded? 

    Yes  DIAGNOSE the PCM Diagnostic Trouble Codes (DTCs). Refer to the appropriate Engine article for the procedure.
    No  If DTC U0100:00 was originally retrieved from the OCSM, GO to  A5 If DTC U0100:00 was originally retrieved from the RCM, GO to  A6

  8. A5 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE OCSM (OCCUPANT CLASSIFICATION SYSTEM MODULE) SELF-TEST

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

    • Check for recorded Diagnostic Trouble Codes (DTCs) from the OCSM self-test.

    Is DTC U3003:16 or U3003:17 recorded? 

    Yes 
    No  GO to  A7

  9. A6 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE RCM (RESTRAINTS CONTROL MODULE) SELF-TEST

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

    • Check for recorded Diagnostic Trouble Codes (DTCs) from the RCM self-test.

    Is DTC U3003:16 or U3003:17 recorded? 

    Yes 
    No  GO to  A8

  10. A7 CHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U0100:00 SET IN MODULES OTHER THAN THE OCSM (OCCUPANT CLASSIFICATION SYSTEM MODULE)

    • Using a diagnostic scan tool, perform self-test for all modules.

    Is DTC U0100:00 set in the ABS module or in the RCM? 

    Yes  GO to  A9
    No  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 OCSM. REFER to: Occupant Classification System (OCS) Sensor - Vehicles With: Multi-Contour Seats . or

  11. A8 CHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U0100:00 SET IN OTHER MODULES OTHER THAN THE RCM (RESTRAINTS CONTROL MODULE)

    • Using a diagnostic scan tool, perform self-test for all modules.

    Is DTC U0100:00 set in the ABS module or in the OCSM? 

    Yes  GO to  A9
    No  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 RCM. REFER to: Restraints Control Module (RCM) .

  12. A9 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION

    NOTE: Make sure all SRS components and the RCM electrical connectors are connected before carrying out the self-test. If not, Diagnostic Trouble Codes (DTCs) will be recorded.

    • Ignition OFF.

    • Disconnect and inspect the PCM connectors.

      • inspect connector(s) (including any inline connectors) for pushed-out, loose or spread terminals and loose or frayed wire connections at terminals.
      • inspect wire harness for any damaged, pinched, cut or pierced wires.
      • inspect Connector Position Assurance (CPA) levers/locks for correct operation.
      • repair any concerns found. Refer to OEM CONNECTOR REPAIR PROCEDURES for schematic and connector information.

    • Reconnect the PCM connectors. Make sure they seat and latch correctly.

    • Ignition ON.

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

    Was the original DTC retrieved on-demand during self-test? 

    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, Refer to PCM Guided Routine Testing .
    No  The system is operating correctly at this time. The concern may have been caused by module connects. ADDRESS the root cause of any connector or pin issues.
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