Vehicles are equipped with a dedicated control module that monitors and controls the operation of the ABS (Anti-Lock Brake System). The ABS Module receives information from different speed sensors, which measure the speed at which each wheel turns individually.
If the ABS system is working properly, the ABS module compares the rotational speed of each wheel and then sends this information to the PCM (Powertrain Control Module). This module shares it with other systems, such as the Stability and Traction Control Module, among others.
The PCM constantly monitors the CAN bus to check that the messages being sent to the Transmission Control Module (TCM) are right. If the TCM is unable to receive information from the ABS Module within the period determined by the manufacturer, the DTC U0415 OBDII code will be set.