Code Definition

C0045 — Left Rear Wheel Speed Sensor Circuit

System: Chassis  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About C0045

C0045 is a generic (obd-ii standard) chassis diagnostic trouble code. It belongs to the C-prefix family of codes, which covers chassis, braking, steering, suspension, or stability-control faults.

When C0045 is stored, the module has detected a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: Chassis (C) codes are stored in the ABS, traction control, or stability-control modules. An enhanced or OEM-level scan tool is usually required to read and clear them.

Because C0045 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The Electronic Brake Control Module (EBCM), also referred to as the ABS module, continuously monitors the electrical circuit feeding the left rear wheel speed sensor and sets DTC C0045 when that circuit falls outside its expected operating parameters. Most modern applications use an active wheel speed sensor, a hall effect or magneto resistive device supplied with a regulated voltage from the module that returns a switched current signal whose frequency rises with wheel speed, while older applications use a passive variable reluctance sensor that generates its own AC voltage as the tone ring p...

Join TaT to view the complete code information and diagnostic details.

Quick Facts