P0602

P0602-CONTROL MODULE PROGRAMMING ERROR/NOT PROGRAMMED





Theory of Operation
The Transmission Control Module (TCM) performs various internal tests to verify proper controller operation. If the TCM detects that the variables that dictate the vehicle application are not present, the controller will enter Limp-in mode and illuminate the MIL.
- When Monitored:
Continuously with the ignition on.
- Set Condition:
If the TCM detects that the variables that dictate the vehicle application are not present.

Possible Causes
CONTROLLER NOT CODED
TRANSMISSION CONTROL MODULE

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.

Diagnostic Test
1. CHECK IF THE TCM IS FLASHABLE

NOTE: Controller is programmed with generic software and will not allow the correct vehicle Powertrain management. With the scan tool, record the vehicles controller part number. Select Use Controller Part Number under the Flash Tab. Flash the controller with the correct software.

Were you able to update (flash) the controller successfully?
Yes >>Test Complete. Perform NAG1 TRANSMISSION VERIFICATION TEST. Transmission Verification Test
No >>Replace the TCM. Perform NAG1 TRANSMISSION VERIFICATION TEST. Transmission Verification Test