C0574Brake Pressure Sensor C Circuit Range/Performance
- Generic OBD-II code · Chassis
- Turns on the check-engine light
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- Here the sensor C signal is electrically within limits but does not make sense. GM's 2016–2019 hybrid brake modules learn the zero point while the pedal is released and set C0574 if the offset exceeds ±1,500 kPa; to confirm a repair the car is driven at about 37 mph for 5 s without braking. A 2019 EBCM compares its two secondary circuit pressure signals with each other and with pedal travel (difference above 5 bar), checks each learned offset (above 10 bar) and catches erratic readings within 80 ms. The 2023 and 2025 tables allow an offset of 12 bar. All are Type A with MIL. A Lucas/ZF patent shows why several sensors are needed: only a comparison of three or more at a shared pressure tells which one has drifted.
- What you may notice
- Check engine light and ABS or stability lamp (GM)
- Uneven or changed braking feel when regeneration blends in
- Code returns after clearing once the car has been driven
- Likely causes
- LikelyPressure sensor zero point drifted with age or temperature
- PossibleResidual pressure while learning, e.g. dragging pedal or sticking valve
- PossiblePoor sensor ground shifting the signal level
- RareSensor values not relearned after replacing the brake module
- Repair
- Hard · Usually a job for a workshop.Typical cost: €60 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.