DTC P0601-P0604 or P062F 5.3L
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
The internal fault detection is handled inside the TCM. No external circuits are involved.
Conditions for Running the DTC
The TCM runs the program to detect an internal condition when the engine is running. The only requirements are voltage and ground. This program runs even if the voltage is out of the valid operating range.
Conditions for Setting the DTC
The TCM has detected an internal condition.
Action Taken When the DTC Sets
| • | DTC P0601, P0602, P0603, P0604, and P062F are type A DTCs. |
| • | The TCM commands maximum line pressure. |
| • | The TCM forces the torque converter clutch (TCC) OFF. |
| • | The TCM inhibits TCC engagement. |
| • | The TCM freezes transmission adaptive functions. |
P0601, P0603, P0604, and P062F
The TCM commands a soft landing to 2nd gear.
P0602
The TCM commands an immediate landing to 2nd gear.
Conditions for Clearing the DTC
DTC P0601, P0602, P0603, P0604, and P062F are type A DTCs.
Diagnostic Aids
DTC P0602 indicates the TCM is not programmed.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics
Connector End View Reference
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Circuit/System Verification
- Verify that DTC P0602 is not set.
- If DTC P0602 is not set or DTC P0602 resets, replace the TCM.
| ⇒ | If DTC P0602 is set, program the TCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for TCM replacement, setup, and programming
