2020 Ford GTFACTORY OEM SERVICE PROCEDURE

Pinpoint Test E: Internal Module DTCS

  1. Normal Operation and Fault Conditions 

    The GSM runs periodic tests on itself. It sets a DTC if any of the results are outside of normal operating standards.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    GSM P0605:00 Internal Control Module Read Only Memory (ROM) Error: No Sub Type Information This DTC indicates a ROM check sum error.
    GSM P0606:00 Control Module Processor: No Sub Type Information This DTC indicates the GSM experienced a reset without going through a proper sleep cycle.
    GSM P0607:00 Control Module Performance: No Sub Type Information This DTC indicates an early or delayed response of greater than 10 percent of its periodic rate.
    GSM P06B8:00 Internal Control Module Non-Volatile Random Access Memory (NVRAM) Error: No Sub Type Information This DTC indicates a RAM check sum error.
    GSM P164E:00 Internal Control Module Transmission Range Select Performance: No Sub Type Information This DTC indicates the GSM experienced a start up test failure, a program flow monitor failure, an IPC software failure, or a 5V_1_MONITOR failure.

    Possible Sources 

    • Discharged battery/charging system
    • GSM calibration
    • GSM

  2. E1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)

    • Ignition ON.

    • Retrieve all CMDTCs from the GSM.

    Is DTC P0562 or P0563 present in the GSM? 

    Yes  RESOLVE those DTCs first.
    No  GO to  E2

  3. E2 PROGRAM THE GSM (GEAR SHIFT MODULE) WITH THE LATEST SOFTWARE

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

    • Ignition ON.

    • Clear all DTCs from the GSM.

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

    Is DTC P0605, P0606, P0607, P06B8 and/or P164E present in the GSM? 

    Yes  INSTALL a new GSM. REFER to: Gear Shift Module (GSM)  .
    No  The fault is not present at this time. It may have been caused by a module programming error.
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.