Due to vehicle electronic control many control units apply to the vehicle and these perform many controls by receiving signals from sensor. So the common use among each sensors and the need of comunizing informations became a prominent figure. CAN comunication method is used at power train (ABS, trnasmission, engine, ECS etc) control of vehicle because it withstands eletronical external noise by generating spark and can high-speed comunication. Though CAN communication, ECM and TCM hold engin RPM, APS, step of trensmission, decreasing of torque in common and perform the active control.

This failure code is set if CAN BUS ERROR that means wrong TCCU installation is continued for more than 1sec.