DTC U0074-00: Control Module Communication Bus "B" Off [07/2015 - 08/2018]: Contents

DTC No.	Detection Item	DTC Detection Condition	Warning Indicate	Memory	Fail-safe Operation	Note
U007400	Control Module Communication Bus "B" Off	CAN system communication error (local CAN between ECM and TCM)* *: ATX	Check engine light: OFF Master warning light: OFF Charging system warning light: OFF Engine oil warning light: OFF Wrench warning indicator light: OFF	DTC stored	Not applicable	Drive cycle: 1 Monitor item: Other Self test type: CMDTC self test, KOEO self test, KOER self test

DTC DETECTION CONDITION	CAN system communication error (local CAN between ECM and TCM)
DTC DETECTION CONDITION	Malfunction in CAN bus communication line. Diagnostic support note This is a continuous monitor (other). The check engine light does not illuminate. FREEZE FRAME DATA (Mode 02) is not available. Snapshot data is available. DTC is stored in the ECM memory.
FAIL-SAFE OPERATION	Not applicable
TROUBLE AREA	CAN communication line malfunction between ECM and TCM (local CAN between ECM and TCM) TCM terminal C24-11-ECM terminal C27-1 TCM terminal C24-13-ECM terminal C27-31 TCM DTC is stored. ECM malfunction TCM malfunction