C0643Brake Pressure Sensor K Circuit Low
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- Sensor K reports less voltage than any valid pressure would give. Bendix's truck ESP treats brake demand and load sensors individually and, if one of them fails, disables only ESP while ABS and traction control carry on; this graded reaction shows why the code may leave basic ABS working. GM's 2016 hybrid module compares the wheel pressure signal with ground and sets its low code under 0.3 V within 0.1 s. Denso points out that a broken supply wire reads exactly like this when the module pulls its input down, so a low code does not rule out an open. Which sensor K would be is not published by any carmaker. GM's PIP5094 keyword list contains C0643 from its old numbering, unrelated to this sensor.
- What you may notice
- ESC lamp on, ESC switched off
- ABS and traction control may keep working
- Likely causes
- LikelySignal line shorted to ground
- PossibleBroken sensor supply read as 0 V through the input pull-down
- RareSensor K without output
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €1,600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.