C05C6 code meaning
Brake Pressure Sensor F Circuit Low
What C05C6 means
The signal of pressure sensor F sits below its valid band. Ratiometric 5 V pressure sensors normally output roughly 0.5 to 4.5 V; Denso describes treating 0 to 0.3 V as a fault zone, and with a pull-down resistor at the input a broken supply or signal wire also drags the reading toward zero. Saab/GM sets its brake pressure circuit code when signal or 5 V reference has a ground short or an open lasting 0.1 s and then disables ABS and traction control. No manufacturer publishes C05C6 for sensor F, so the letter-to-sensor mapping is not public. Measure supply, ground and signal at the connector before replacing the sensor. C05C7 is the high side, C05C8 the open circuit, C05C9 the shared supply.
C05C6 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 C05C6
- ABS, ESC and traction control warning lamps on
- Stability and traction control unavailable
Common causes of C05C6
- Most likelySignal wire shorted to ground
- Possible5 V reference interrupted or shorted to ground
- PossibleInternal fault of pressure 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 C05C6 means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| C6 | The exact fault in that area. |
What to do next
- Note C05C6 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 C05C6
What does C05C6 mean?
C05C6 means "Brake Pressure Sensor F Circuit Low". The signal of pressure sensor F sits below its valid band. It is a generic code, so it means the same on every make.
Is it safe to drive with C05C6?
Drive gently and only to a workshop. With C05C6 the car can go into limp mode (reduced power) to protect itself.
Will C05C6 fail an emissions test?
C05C6 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 C05C6 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. This is a job for a workshop.
Will C05C6 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.