Transmission Control Module

NOTE: Vehicles may be equipped with a 3-connector or 4-connector PCM. The Next Generation Controller (NGC) combines the Powertrain Control Module (PCM) and the Transmission Control Module (TCM) into a single controller. The NGC PCM has 4 harness connectors (Black C1, Gray C2, White C3 and Green C4) and the Jeep/Truck Engine Controller (JTEC) PCM has 3 harness connectors.

TCM uses input information to control line pressure and solenoids. TCM has 7 shift schedules based on transmission fluid temperature to extend transmission life. If TCM senses a problem, it stores a DTC. For additional information on TCM, see appropriate DIAGNOSIS article in AUTOMATIC TRANSMISSIONS.