Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC P0601: Transmission Control Module (TCM) Read Only Memory (ROM)DTC P0602: Transmission Control Module (TCM) Not Programmed
DTC P0603: Transmission Control Module (TCM) Long Term Memory Reset
DTC P0604: Transmission Control Module (TCM) Random Access Memory (RAM)
DTC P062F: Transmission Control Module (TCM) Long Term Memory Performance
Circuit/System Description
This is an internal fault detection of the control solenoid (w/body and TCM) valve assembly. This fault is carried out inside the control solenoid (w/body and TCM) valve assembly and no external circuits are involved.
Conditions for Running the DTC
| • | The control solenoid (w/body and TCM) valve assembly runs the program to detect an internal fault when the key is ON or the engine is running. |
| • | Ignition voltage is between 8.6-18.0 volts - DTC P062F only. |
Conditions for Setting the DTC
P0601
The read only memory (ROM) test has failed 5 or more times.
P0602
The transmission control module (TCM) has detected no start program.
P0603
The TCM has detected a memory checksum error.
P0604
The TCM random access memory (RAM) test has failed 5 or more times.
P062F
The TCM has detected non-volatile memory is incorrect during power-down.
Action Taken When the DTC Sets
| • | DTCs P0601, P0602, P0603, P0604, and P062F are Type A DTCs. |
| • | The TCM shifts to a default gear, shuts down, and turns OFF. |
Conditions for Clearing the DTC
DTCs P0601, P0602, P0603, P0604, and P062F are Type A DTCs.
Diagnostic Aids
When attempting to set TCM internal DTCs let the engine run for at least 1 minute and then shut the engine off for at least 30 seconds. Following this procedure will allow a complete TCM shutdown. Reprogram the TCM and retest the DTC to see if the DTC resets.
Reference Information
Description and Operation
Electronic Component Description
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Circuit/System Verification
- Start the engine.
- Let the engine run for 1 minute, then shut the engine OFF for at least 30 seconds.
- Retest for DTCs P0601, P0602, P0603, P0604, and P062F.
Circuit/System Testing
Reprogram the TCM and recheck for DTCs.
| ⇒ | If the DTC resets, replace the control solenoid (w/body and TCM) valve assembly. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Perform the Service Fast Learn Adapts if internal transmission repairs are performed.
