C05C8Brake Pressure Sensor F Circuit/Open
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- General circuit fault of pressure sensor F, most often a break in one of its three wires (supply, signal, ground) or a connector that has lost contact. Where the reading ends up depends on the input circuit: Honeywell notes that after a power or ground loss the output goes high with a pull-up and low with a pull-down resistor, so an open line can look like C05C6 or C05C7 unless the module tells them apart. Saab/GM flags an open or high resistance on the brake pressure signal or 5 V reference after 0.1 s. Bosch advises checking the live value of a modulator-mounted pressure sensor before buying an expensive part. No manufacturer publishes C05C8 for sensor F. Repair wiring or connector, then clear and retest.
- What you may notice
- ABS and ESC warning lamps on
- Stability control and brake assist functions not available
- Likely causes
- LikelyConnector unplugged, corroded or with pushed-back pins
- PossibleBroken wire in the sensor harness
- RareInternal open circuit in sensor F
- Repair
- Medium · Usually a job for a workshop.Typical cost: €30 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.