AI DamageC05B0 code: Brake Hydraulic Circuit C Leak
Code C05B0 is named in 4 US owner complaints. Models: 3, model years 2019–2025.
What the code means
Brake Hydraulic Circuit C Leak. Generic meaning per SAE J2012 (the same for all makes).
How to read C05B0: the letter C means chassis (brakes, ABS, steering, suspension); the second digit 0 marks a generic SAE code shared by all makes; the last three characters 5B0 identify the specific fault.
ABS/ESC codes: wheel speed sensors, the ABS hydraulic unit and pump, brake booster, pressure and yaw sensors. A hit to a wheel or suspension often damages the wheel speed sensor or its wiring, so on a damaged car this code is a reason to inspect the hub, knuckle and control arms, not just swap the sensor.
Key figures
- Complaints with this code
- 4
- Models
- 3
- Model years
- 2019–2025
Which models and years
Models whose owners name this code (3). Years link to the model year problems page.
Components named together with the code
Component as the owner filed it (one complaint can list several).
Complaints by model year
What to do if an auction car has this code
- Inspect the wheel and suspension on the impact side: the wheel speed sensor is often damaged together with the hub or knuckle.
- Check whether the ABS and ESC lights stay on after start-up.
- After replacing sensors or the hydraulic unit, bleeding and scan tool adaptation may be required.
What owners report
Excerpts of owner complaints in the original wording. Owner statements not verified by the regulator; personal data removed.
When we started the vehicle to leave, multiple warning lights appeared and the truck had very little braking capability. [dealer] dealer documented DTC C05B0 and found that the driver's-side rear brake caliper had separated and was leaking brake fluid from the actuator side.
Alarm codes P25A2 & C05B0 -Brake system failure 43mph top speed -Service trailer brake system -Service brake assist -Service ESC -Check engine light -Traction control light My vehicle is not showing any recall, but obviously Iâm not the only one with this issue.
The following morning the truck was was started and all seemed normal like nothing ever happened, no warning lights or warning messages Our of concern we dropped off at [dealer] service center to diagnose the issue. They reported finding code C05B0 for Brake Fluid Leak.
Related codes
- C0020ABS Pump Motor Control
- U0121Lost Communication With Anti-Lock Brake System…
- U0415Invalid Data Received From Anti-Lock Brake…
- U0416Invalid Data Received From Vehicle Dynamics…
- U0418Invalid Data Received From Brake System…
- C0561Vacuum Sensor A/B Correlation
- C0021Brake Booster Performance
- C0063Yaw Rate Sensor
- C0040Brake Pedal Switch A
- C006CStability System
Sources: public official US data (owner complaints) and the SAE J2012 standard. Complaints are owner statements not verified by the regulator. A code from a complaint does not replace a scan tool diagnosis. Data updated 2026-11-10.