C0028 Code – ABS Rear Right Wheel Speed Sensor Circuit Fault

on

C0028 Code – ABS Rear Right Wheel Speed Sensor Circuit Fault

The C0028 Diagnostic Trouble Code (DTC) is a manufacturer-specific chassis code related to the Anti-lock Braking System (ABS). On many Subaru models, it indicates a Rear Right ABS Wheel Speed Sensor Circuit Open or Short. Other manufacturers may assign a different definition depending on the vehicle platform.

Common Symptoms

  • ABS warning light illuminated.
  • Brake warning light ON.
  • Traction Control (TCS) or Stability Control (ESC/VDC) disabled.
  • ABS may not activate properly during hard braking.

Possible Causes

  • Faulty rear right ABS wheel speed sensor.
  • Open or short circuit in the sensor wiring.
  • Loose or corroded electrical connector.
  • Damaged tone ring (reluctor ring).
  • Faulty wheel bearing affecting the sensor signal.
  • ABS control module malfunction.
  • Low battery or charging system voltage.

How to Diagnose

  1. Scan the ABS module for stored DTCs.
  2. Check Freeze Frame and Live Data.
  3. Compare all four wheel speed sensor readings while driving.
  4. Inspect the rear right sensor wiring and connector.
  5. Inspect the tone ring and wheel bearing.
  6. Measure sensor resistance or signal output.
  7. Repair the fault, clear the code, and perform a road test.

C0028 Code Meaning by Vehicle Brand

Vehicle Brand Typical Meaning
Subaru Rear Right ABS Wheel Speed Sensor Circuit Open or Short.
GM (Chevrolet, GMC, Cadillac, Buick) Brake Booster Solenoid or ABS Circuit Fault (model dependent).
Chrysler / Dodge / Jeep / RAM Manufacturer-specific ABS system fault.
Toyota / Lexus ABS actuator or wheel speed sensor fault depending on the model.
Ford / Lincoln Manufacturer-specific ABS diagnostic code.
Honda / Acura Manufacturer-specific ABS or brake system fault.
Hyundai / Kia Manufacturer-specific brake control system fault.
Volkswagen / Audi / Skoda / SEAT Manufacturer-specific ABS electronics fault.

Related DTCs

  • C0026
  • C0027
  • C0029
  • C0035
  • C0040
Important: The definition of C0028 varies by manufacturer. Subaru commonly defines it as a Rear Right ABS Wheel Speed Sensor Circuit Open or Short, while other manufacturers may assign a different ABS-related meaning.

Comments

Post a Comment