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 Descriptor
DTC P0602: Transmission Control Module (TCM) Not ProgrammedCircuit/System Description
The transmission control module (TCM) determines if it has a proper calibration. The TCM detects the presence of improper calibration by checksum and name comparison. This is internal to the TCM. No external circuits are involved.
Conditions for Running the DTC
The TCM conducts the test one time at power up.
Conditions for Setting the DTC
The DTC will set if the default calibration is detected.
Action Taken When the DTC Sets
The transmission will go to a hydraulic default shift mode of reverse, neutral and third range.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics
Connector End View Reference
Description and Operation
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Ignition on, verify that DTC P0602 does not set.
Circuit/System Testing
- Recalibrate the TCM. Refer to Control Module References for TCM replacement, setup, and programming.
- Ignition on, verify that DTC P0602 does not set.
- Perform fast learn procedure. Refer to FastLearn Procedure.
| ⇒ | If DTC resets, replace the TCM. Refer to Control Module References for TCM replacement, setup, and programming. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for TCM replacement, setup, and programming. |
Repair Verification
If another DTC is present, refer to Diagnostic Trouble Code (DTC) List - Vehicle and perform the appropriate diagnostic procedure.
