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Home >> Jeep >> 2013 >> Compass Limited, AWD, Trans Mfr CD CVT2 >> Repair and Diagnosis >> External Pages >> Different car >> Section 121 (Transmission Control Module (TCM) - Electrical Diagnostics) >> DTC Troubleshooting >> P1679-Calibration Not Learned >> Theory Of Operation

Theory Of Operation

WARNING: This page is about a different car, the 2012 Jeep Patriot and 2012 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 there is no stored hydraulic calibration stored in the TCM this DTC will set. It takes one failure to turn on the MIL.

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