C0655Left Front Wheel Speed Sensor B Intermittent/Erratic
- Generic OBD-II code · Chassis
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- C0655 points to a second left front speed signal that drops out or jumps. Active sensors read the wheel through closely spaced sensing elements whose phase-shifted signals also give the rotation direction, as FenderBender explains, so small mechanical faults show up as irregular pulses. HELLA lists the usual reasons a wheel sensor fails: broken wiring, internal shorts, heavy dirt, extra wheel bearing play and a damaged encoder. Volvo Truck's dual-element design discards a channel that reads zero and carries on with the other. Bosch stresses that the redundant signal must be permanently available to avoid delays when the backup actuator takes over. GM's PIP5094 lists C0655 only as an unrelated old GM number.
- What you may notice
- Warning that comes and goes, often on rough roads or while steering
- Automated or redundant brake functions intermittently withdrawn
- Likely causes
- LikelyLoose contact or partly broken wire that moves with the steering and suspension
- PossibleDirt or damage on the magnetic encoder
- RareExcessive wheel bearing play changing the air gap
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.