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Pinpoint Test I: Internal Module DTCS

  1. Normal Operation and Fault Conditions 

    The GSM performs 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 The GSM detected a ROM checksum error.
    GSM P0606:00 Control Module Processor: No Sub Type Information The GSM detected a reset without going through a proper sleep cycle.
    GSM P0607:00 Control Module Performance: No Sub Type Information The GSM detected 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 The GSM detected a RAM checksum error.
    GSM P164E:00 Internal Control Module Transmission Range Select Performance: No Sub Type Information The GSM detected a start up test failure, a program flow monitor failure, an IPC software failure, or a 5V_1_MONITOR failure.

    Possible Causes 

    • Discharged battery/charging system
    • GSM calibration
    • GSM

  2. I1 CHECK THE GSM (GEAR SHIFT MODULE) FOR CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODES (CMDTCS)

    • Ignition ON.

    • Retrieve all CMDTC s from the GSM.

    Is DTC P0562 or P0563 present in the GSM ' 

    Yes  RESOLVE those DTC s first.
    No  GO to  I2

  3. I2 PROGRAM THE GSM (GEAR SHIFT MODULE) WITH THE LATEST CALIBRATION

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

    • Ignition ON.

    • Clear all diagnostic trouble codes (DTCs) from the GSM.

    • Road test the vehicle.

    • Ignition OFF.

    • Ignition ON.

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

    Is DTC P0605, P0606, P0607, P06B8 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.
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