The Electrical Brake Control Module (EBCM) is responsible for providing an ignition signal to the Wheel Speed Sensors. The sensors then tell the module, via a square wave signal, what the wheel speed is. To achieve this, these sensors have a reluctor ring, which with each movement it makes creates interruptions in the magnetic field, in order to give pulses that are sent to the EBCM or other module that requires it, to determine how fast the wheel rotates.
The setting of diagnostic code C0045 OBD2 occurs when one of the wheel speed sensors malfunctions. In this case, the code specifically states that it is on the sensor for the left rear wheel.
How does the C0045 Generic Fault Code work?
In the Fault Code Library, this is part of the Chassis Codes. This code is notable for diagnosing the Vehicle’s Speed Sensor (VSS). The Speed Sensor gets an electrical signal from the Electronic Brake Control Module, as the wheel rotates this module uses the frequency of the sensor signal to calculate the vehicle speed.
Vehicles with electronic brake control systems have speed sensors on all 4 wheels, this is called a four-channel ABS Brake System. The speed sensors are magnetic sensors located in the transaxle, where the odometer cable was installed. Consequently, this leads to the system detecting the vehicle fault code C0045.