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Home >> Jeep >> 2011 >> Compass Base, 2.0 A, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 73 ((Transmission Control Module (TCM) Electrical Diagnostics - CVT Automatic Transmission) - MK) >> DTC Troubleshooting >> U1146 - Lost Communication With External Memory >> Theory Of Operation

Theory Of Operation

WARNING: This page is about a different car, the 2017 Jeep Patriot and 2017 Jeep Compass. However, it is still accessible from the selected car via links, so may be relevant.

The first time the vehicle is started, the Transmission Control Module (TCM) receives hydraulic calibration data from an external EEPROM (located in the transmission) and stores this information in the EEPROM of the TCM. If the TCM can not read the external EEPROM in the transmission this DTC will set. It takes two consecutive failures to turn on the MIL.

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