Helpful Automotive Resources
U0073 Code: Control Module Communication Bus “A” OffDiagnostic Trouble Code (DTC) U0073 stands for Control Module Communication Bus “A” Off. OBD code U0073 is a communication system DTC that applies to most vehicles. Usually, this code is triggered when communication is lost intermittently or fully between your vehicle’s control modules.
U0101 Code: Lost Communication with TCMDiagnostic Trouble Code (DTC) U0101 stands for Lost Communication with TCM. This code appears when the TCM is not receiving nor transmitting messages on the CAN bus.
P0725 Code: Engine Speed Input CircuitDiagnostic trouble code (DTC) P0725 stands for “Engine Speed Input Circuit.” This code is logged when the transmission control module (TCM) does not receive a valid engine speed signal from the engine control module (ECM).