C059FBrake Pressure Sensor E Circuit Low
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- ABS/ESC warning lamp on
- Stability control and pressure-based brake functions switched off
- Likely causes
- 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)
- Repair
- Hard · Usually a job for a workshop.Typical cost: €80 – €1,800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.