C1125: Brake Fluid Level Sensor Input Circuit Failure
CriticalChassisAnti-Lock Brakes
What does C1125 mean?
C1125 is a diagnostic trouble code indicating "Brake Fluid Level Sensor Input Circuit Failure". A sensor in the anti-lock brakes is reporting abnormal data or has lost communication with the ECU. Sensors can fail due to age, contamination, heat exposure, or wiring issues.
Symptoms you may notice
- Check engine light (MIL) illuminated on dashboard
- ABS warning light on
- Brake pedal feels different
- Unusual braking behaviour
- Intermittent warning lights
Estimated repair cost
Typical range in Australia (parts + labour)
$200 – $1000 AUD
Common causes
- Faulty anti-lock brakes component
- Wiring or connector issue in the related circuit
- Failed sensor providing incorrect readings
- Software/calibration issue requiring ECU update
- Related component causing secondary fault
What should you do?
This is a critical issue. Stop driving as soon as it is safe to do so and have the vehicle inspected immediately. Continuing to drive could cause further damage or pose a safety risk.
Get a diagnosis for YOUR car
Code C1125 can mean different things depending on your vehicle. TorqueBot gives you a diagnosis specific to your make, model, and year.