What it means
The brake pressure sensor C reading is outside the expected range or is implausible. The code alone does not identify whether the cause is the sensor or its circuit.
At a glance
- Usually lights the ABS or stability-control warning light
- The engine or gearbox may go into limp mode
How it works
Brake pressure sensor C measures hydraulic pressure for the brake control module. C0574 indicates that sensor C’s reading is outside the expected range or does not fit the module’s plausibility checks, which can limit pressure-based ABS or stability control.
Common causes
Most likely first.
- Sensor reading drifted
- Sensor element aged beyond calibration window
- Sensor mounting loose - signal damping
Symptoms
- Brake or ABS warning light
- Brake pressure or stability-control functions may be limited
How to diagnose it
- Review freeze-frame and live brake-module data for pressure sensor C and compare its reading with other available brake-pressure data.
- Inspect sensor C’s mounting and connector for looseness, corrosion, or damage that could distort or interrupt its reading.
- Check sensor C’s wiring and connector for damage, then verify its supply, ground, and signal circuits against the manufacturer’s specification.
- Observe sensor C’s reading as brake pressure changes during a safe, manufacturer-approved test to see whether it responds smoothly and plausibly.
- If the circuit checks pass, confirm sensor C’s calibration and mounting condition using the vehicle-specific procedure.
Common fixes
- Secure loose pressure sensor C mounting if it is affecting the reading.
- Repair damaged wiring or connector terminals in sensor C’s circuit.
- Correct a sensor supply or ground fault confirmed by testing.
- Replace pressure sensor C if its reading remains implausible with sound wiring and mounting.
Can I keep driving?
A brake or ABS warning may mean pressure-based braking or stability-control functions are limited. Avoid hard braking and slippery conditions, and stop if braking feels abnormal; arrange prompt diagnosis.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.