Pinpoint Test G: Internal Module Diagnostic Trouble Codes (DTCS)
- Normal Operation and Fault Conditions
The GSM carries out 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 GSM program and calibration ROM checksum error. The GSM will prevent shifting from park for the rest of the operation cycle. GSM P0606:00 Control Module Processor: No Sub Type Information This DTC indicates an unintended GSM reset while the ignition was on. GSM P0607:00 Control Module Performance: No Sub Type Information This DTC indicates an early or delayed execution of a GSM task by 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 GSMRAM checksum error. GSM P164E:00 Internal Control Module Transmission Range Select Performance: No Sub Type Information This DTC indicates an internal GSM software or hardware malfunction. When this DTC is set, the GSM is put into a safe state and all GSM can messages are considered invalid. The IPC will inhibit improper range changes, and make sure park is engaged when park is selected. Possible Sources
- Discharged battery/charging system
- GSM calibration
- GSM
- G1 CHECK THE BATTERY CONDITION AND STATE OF CHARGE
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NOTE: If necessary connect a battery charger to the vehicle battery to make a steady battery voltage is available while performing this test.
Carry out the battery condition test. REFER to: Battery .
Did the battery pass the condition test?
Yes GO to G2 No CHARGE or INSTALL a new battery as necessary. REFER to: Battery . -
- G2 CHECK THE GSM (GEAR SHIFT MODULE) FOR CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODES (CMDTCS)
- Ignition ON.
- Retrieve all continuous memory diagnostic trouble codes (CMDTCs) from the GSM.
Is DTC P0562 or P0563 present in the GSM?
Yes RESOLVE those diagnostic trouble codes (DTCs) first. REFER to Diagnostic Trouble Code (DTC) Chart . No GO to G3 - G3 PROGRAM THE GSM (GEAR SHIFT MODULE) WITH THE LATEST CALIBRATIONNOTE: 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 during the self-test.
- Ignition ON.
- Clear all diagnostic trouble codes (DTCs) from the GSM.
- Reprogram the GSM with the latest calibration. REFER to: Module Configuration - System Operation and Component Description .
- 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 GO to G4 No The fault is not present at this time. It may have been caused by a module programming error. - G4 CHECK FOR CORRECT GSM (GEAR SHIFT MODULE) OPERATION
- Ignition OFF.
- Disconnect and inspect the GSM connector.
- 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 GSM 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 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, INSTALL a new GSM. REFER to: Gear Shift Module (GSM) . 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.