P1644 Incorrect variant/configuration

P1644 code

P1644 code - The transmission control module (TCM) perform 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 DTC is continuously with the ignition on. Set condition this DTC if the TCM detects that variables that dictate the vehicle application are not present.

Possible causes P1644 code:

- Controller not coded

- Transmission control module (TCM)

Perform TCM replacement procedure

Controller is programmed with genetic software and will not allow the correct vehicle powertrain management. With the scan tool, perform the TCM replacement procedure/

Were you able to update the controller successfully ?

Yes, test complete. Perform NAG1 Transmission Verification Test. 

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 NAG1 Transmission Verification Test. 

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