P1644-INCORRECT VARIANT/CONFIGURATION
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, the controller will enter Limp-in mode and illuminate the MIL.
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When Monitored:
Continuously with the ignition on.
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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 Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure).
PERFORM TCM REPLACEMENT PROCEDURE
| NOTE: | Controller is programmed with generic software and will not allow the correct vehicle Powertrain management. |
| 1. | With the scan tool, perform the TCM replacement procedure. |
Were you able to update 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 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).