C063ABrake Pressure Sensor H Circuit High
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- The output of pressure sensor H is too high to be real. C063A is not documented by any carmaker. Another Toyota patent shows seven pressure points in one brake: accumulator, two master cylinder passages and four control pressures standing for the wheel cylinders. Which of them a system might label H is not public. An excessive signal usually means the line touches a voltage source or the sensor ground is lost; some sensors also park their output at the top on purpose, as Honeywell's MIP transducers do at 97.5 % of supply after an internal fault or overpressure. Saab's 9-5 ESP sets its pressure sensor code above 4.75 V within 0.1 s and also checks that the sensor supply stays between 4.4 and 5.6 V. Measure ground and feed at the plug before replacing parts.
- What you may notice
- ABS/ESC warning lamp on, ESC unavailable
- Implausibly high brake pressure in live data at rest
- Likely causes
- PossibleSignal line touching a 5 V or battery feed
- PossibleSensor ground open or high resistance
- PossibleSensor reports an internal fault or overpressure at its upper rail
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €1,600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.