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Home >> Fiat >> 2012 >> 500 Pop, Automatic Trans >> Repair and Diagnosis >> Transmission >> Automatic Trans >> (Transmission Control Module (TCM) - Electrical Diagnostics) >> Diagnosis And Testing >> P1D84-Etc System Failure >> Theory Of Operation
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Theory Of Operation

The Transmission Control Module (TCM) performs basic system checks to ensure proper controller operation. This Diagnostic Trouble Code (DTC) sets if the TCM receives an ETC error bus message from the Powertrain Control Module (PCM).

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