C0653Left Front Wheel Speed Sensor B Circuit Low
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- C0653 means the circuit of left front sensor B sits below its valid level. Active wheel speed sensors usually signal through current steps; Allegro gives 7 and 14 mA as typical levels and a safe state below about 3.9 mA that a sensor uses to report its own fault. A reading under the lower band can therefore come from a shorted or chafed line, a supply that has dropped, or the sensor itself flagging an error. In Bosch's shared-sensor design each ECU feeds its sensors and checks supply voltage and the lines for shorts and opens. Bosch also offers a redundant-signal version of its wheel speed sensor, so the second channel is always ready for the backup actuator. No carmaker documents C0653.
- What you may notice
- Warning for brake or driver assistance system
- Redundant braking or automated driving not available
- Likely causes
- LikelySensor B line chafed through and shorted to ground
- PossibleSupply from the secondary control unit too low
- RareSensor in its fault (safe) state after an internal error
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.