P0601-INTERNAL MEMORY CHECKSUM INVALID
For a complete wiring diagram, refer to the Wiring Information.
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 a DTC will set.
-
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 (TCM) |
Always perform the NAG1 Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure).
CHECK IF TCM IS FLASHABLE
| NOTE: | Controller is programmed with generic software and will not allow the correct vehicle Powertrain management. |
| 1. | With the scan tool, record the vehicles controller part number. |
| 2. | Select Use Controller Part Number under the Flash Tab. |
| 3. | Flash the controller with the correct software. |
Were you able to update (flash) the controller successfully?
Yes
- Test Complete.
- Perform the NAG1 TRANSMISSION VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure).
No
- Using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the TCM in accordance with the Service Information.
- Perform the NAG1 TRANSMISSION VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure).