DTC U0302; TCM Processor Error: Notes

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

DETECTION CONDITION AND POSSIBLE CAUSE

DTC U0302:00	TCM processor error
DETECTION CONDITION	When any of the following conditions is met: CAN communication line malfunction between TCM and PCM TCM internal malfunction Diagnostic support note This is a continuous monitor (other). The check engine light illuminates if the PCM detects the above malfunction condition during the first drive cycle. FREEZE FRAME DATA (Mode 2)/Snapshot data is available. DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	Not applicable
POSSIBLE CAUSE	TCM connector or terminals malfunction PCM connector or terminals malfunction CAN communication line malfunction between PCM and TCM (local CAN between PCM and TCM) TCM terminal G-PCM terminal 1A TCM terminal H-PCM terminal 1B TCM DTC is stored. CAN drive error (TCM or PCM) PCM malfunction TCM malfunction