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Pinpoint Test H: DTC U0301

  1. Refer to Module Communications Network for schematic and connector information.

    Normal Operation and Fault Conditions 

    It is common for multiple vehicle platforms to share a common powertrain while differing in other features such as shift by wire. It is possible to install a PCM that is compatible with the engine and transmission, but not with shift by wire. A PCM that is compatible with shift by wire will send out a compatibility communication signal to the GSM. Each time the GSM wakes up from sleep mode, it will check to make sure that the PCM installed in the vehicle is compatible with shift-by wire.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    GSM U0301:00 Software Incompatibility with ECM/PCM: No Sub Type Information This DTC indicates a PCM that is not compatible with shift by wire is installed in the vehicle. When this DTC is set, the GSM will not allow the vehicle to shift out of park.

    Possible Sources 

    • Low system voltage
    • Incorrect PMI
    • Incorrect or corrupted PCM calibration
    • Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
    • PCM fault

  2. H1 CHECK ALL MODULES FOR LOW VOLTAGE DIAGNOSTIC TROUBLE CODES (DTCS)

    • Using a diagnostic scan tool, review all continuous memory diagnostic trouble codes (CM DTCs) in all modules.

    Is a low voltage DTC set in any module? 

    Yes  RESOLVE the vehicle voltage concern first. REFER to: Charging System - 2.0L EcoBoost (184kW/250PS) - MI4 . REFER to: Charging System - 2.7L EcoBoost (238kW/324PS) .
    No  GO to  H2

  3. H2 CHECK FOR CAUSES OF COMMUNICATION CONCERNS

    NOTE: If new modules were installed prior to the DTC being set, the module configuration can be incorrectly set during the PMI or the PMI may not have been carried out.

    • CHECK the vehicle service history for recent service actions related to the PCM. If recent service history is found:

      • verify correct replacement module was installed

        • HVBOM may be used to verify correct part application

      • verify the configuration of replacement module was correct

        • re-configure module using as-built data if prior configuration is suspect

      • verify the module was not obtained from a like vehicle and installed into customer vehicle

        • return the swapped module to source vehicle and obtain new replacement module

    Were any causes of a communication concern found in the vehicle service history? 

    Yes  Follow the above directions to address improper module replacement or configuration. If the correct module was installed and the PMI was completed correctly, GO to  H3
    No  GO to  H3

  4. H3 PROGRAM THE PCM (POWERTRAIN CONTROL MODULE) WITH THE LATEST CALIBRATION

    NOTE: If a GSM self-test is carried out, the driver door must be fully closed and locked. A false P166B DTC may set if the driver door is not fully closed and locked during the self-test.

    • Using a diagnostic scan tool, program the PCM with the latest calibration. REFER to: Module Programming .

    • Using a diagnostic scan tool, clear all diagnostic trouble codes (DTCs) from the GSM.

    • Ignition OFF.

    • Wait 10 seconds.

    • Start the engine.

    • Press each GSM button in sequence. Let the vehicle move both forward and in reverse.

    • Using a diagnostic scan tool, carry out the GSM self-test.

    Is DTC U0301 present in the GSM? 

    Yes  GO to  H4
    No  The concern is not present at this time. It may have been caused by an incorrect or corrupted PCM calibration.

  5. H4 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION

    • Ignition OFF.

    • Disconnect and inspect all PCM 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

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

    • Operate the system and verify the concern is still present.

    Is the concern still present? 

    Yes  CHECK for an applicable TSB, GSB, SSM, or FSA. If a service bulletin exists for this concern, discontinue this test and follow bulletin instructions. If none address this concern, Refer to PCM GUIDED ROUTINE TESTING
    After programming the new PCM, CARRY OUT the transmission strategy download. For 8F35 transmissions, REFER to: Transmission Strategy Download . For 8F57 transmissions, REFER to: Transmission Strategy Download .
    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.
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