C059F code meaning
Brake Pressure Sensor E Circuit Low
What C059F means
The signal of brake pressure sensor E sits below its valid window. Analogue brake pressure sensors run on 5 V and report roughly 0.5–4.5 V; a Bosch trainer notes such a sensor shows under 1 V with the brake released. A Denso patent on vehicle pressure sensors reserves 0–0.3 V as an error band and explains that, with a pull-down resistor at the module, a broken supply or signal wire also drags the reading to 0 V, so an open circuit can appear as low here. Other causes are a short of the signal to ground or a failed sensor. No maker documents C059F publicly. GM's hybrid brake controller uses the same kind of check on its wheel pressure sensors: below 0.3 V lasting 100 ms, rated Type A. Sensor E is usually built into the hydraulic unit, so a sensor fault often means replacing that unit.
C059F at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyHard
- Typical labor0.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of C059F
- ABS/ESC warning lamp on
- Stability control and pressure-based brake functions switched off
Common causes of C059F
- PossibleSignal wire of the sensor shorted to ground
- PossibleOpen 5 V supply or signal wire pulled low by the module input
- PossiblePressure sensor failed internally (often part of the hydraulic unit)
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Brake pressure sensor eSensor wiring
What each part of C059F means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 9F | The exact fault in that area. |
What to do next
- Note C059F 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 C059F
What does C059F mean?
C059F means "Brake Pressure Sensor E Circuit Low". The signal of brake pressure sensor E sits below its valid window. It is a generic code, so it means the same on every make.
Is it safe to drive with C059F?
Drive gently and only to a workshop. With C059F the car can go into limp mode (reduced power) to protect itself.
Will C059F fail an emissions test?
C059F 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 C059F to fix?
Difficulty: hard. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will C059F clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.