C05C8 code meaning
Brake Pressure Sensor F Circuit/Open
What C05C8 means
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.
C05C8 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of C05C8
- ABS and ESC warning lamps on
- Stability control and brake assist functions not available
Common causes of C05C8
- Most likelyConnector unplugged, corroded or with pushed-back pins
- PossibleBroken wire in the sensor harness
- Less likelyInternal open circuit in sensor F
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Brake pressure sensor fSensor wiring
What each part of C05C8 means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| C8 | The exact fault in that area. |
What to do next
- Note C05C8 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about C05C8
What does C05C8 mean?
C05C8 means "Brake Pressure Sensor F Circuit/Open". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with C05C8?
Drive gently and only to a workshop. With C05C8 the car can go into limp mode (reduced power) to protect itself.
Will C05C8 fail an emissions test?
C05C8 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is C05C8 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. This is a job for a workshop.
Will C05C8 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.