The automatic transmission control module (ATM), also known as the transmission control module (TCM), is an electronic module that controls all aspects of automatic transmission operation in Dodge and Chrysler vehicles.
Functions of the automatic transmission control unit:
* Gear shift control
*Adjusting transmission fluid pressure
* Torque converter lock-up control
*Transmission temperature monitoring
*Transmission protection from overheating or overloads
* Diagnosis and storage of fault codes
Types of automatic transmission control units for Dodge and Chrysler:
* NAG1 (09G)
* 62TE (W6A633)
* 845RE (DRB)
* 948TE (W6A848)
* WF0TX (6L80)
Location of the automatic transmission control unit:
* Usually located in the engine compartment next to or under the automatic transmission.
*May be located in the cup holder or center console on some models.
Servicing the automatic transmission control unit:
* In most cases, changing the automatic transmission oil and filter includes checking or replacing the automatic transmission control unit.
* Diagnostic codes obtained using an OBD-II scanner can help identify problems with the automatic transmission control unit.
* In some cases, it may be necessary to reflash the automatic transmission control unit or replace it.
Signs of a faulty automatic transmission control unit:
* Delayed or hard gear shifting
* Gear slippage
* Inability to change gears
* Switching the automatic transmission into emergency mode
*Powertrain Malfunction Indicator Lamp (MIL) Illuminates
Replacing the automatic transmission control unit:
Replacing an automatic transmission control unit requires special knowledge and equipment. It is recommended that you have this operation performed by a qualified mechanic or dealership.
After installing a new automatic transmission control unit, it may need to be programmed or calibrated to suit your specific vehicle.