C0655 code meaning
Left Front Wheel Speed Sensor B Intermittent/Erratic
What C0655 means
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.
C0655 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairAfter a drive cycle
Symptoms of C0655
- Warning that comes and goes, often on rough roads or while steering
- Automated or redundant brake functions intermittently withdrawn
Common causes of C0655
- Most likelyLoose contact or partly broken wire that moves with the steering and suspension
- PossibleDirt or damage on the magnetic encoder
- Less likelyExcessive wheel bearing play changing the air gap
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Lf wss bTone ringSensor wiring
What each part of C0655 means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 55 | The exact fault in that area. |
What to do next
- Note C0655 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about C0655
What does C0655 mean?
C0655 means "Left Front Wheel Speed Sensor B Intermittent/Erratic". C0655 points to a second left front speed signal that drops out or jumps. It is a generic code, so it means the same on every make.
Is it safe to drive with C0655?
Drive gently and only to a workshop. With C0655 the car can go into limp mode (reduced power) to protect itself.
Will C0655 fail an emissions test?
C0655 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is C0655 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will C0655 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.