C063BBrake Pressure Sensor H Circuit Low
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- C063B says sensor H reads below its valid floor. Unlike C063C the problem is electrical, not a believable but wrong pressure. A Bosch workshop article on a Teves MK60 unit describes the integrated sensor: fed with 5 V, it stays below 1 V with the brakes off and climbs as pedal pressure builds, so the fault limit has to sit well under that rest level. GM's 2019 EBCM flags its circuit pressure sensor as shorted low when the main channel falls under 4.61 % of supply, or the reference channel under 4.85 %, for 100 ms. Where H sits is not published; in Toyota's eight-sensor design the candidates would be a wheel cylinder, the booster chamber or the pump output. Likely: signal shorted to ground, collapsed 5 V reference or a dead sensor.
- What you may notice
- ABS and ESC lamps on
- Brake assist and stability control not available
- Likely causes
- LikelySignal conductor shorted to ground
- Possible5 V reference collapsed by a short in another sensor on the same feed
- PossibleSensor H without output due to an internal defect
- Repair
- Hard · Usually a job for a workshop.Typical cost: €60 – €1,800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.