C0654 code meaning
Left Front Wheel Speed Sensor B Circuit High
What C0654 means
Here the circuit of the second left front sensor reads above its permitted level, typically a short to the battery feed or to the supply of another channel. That risk follows from the packaging: Continental's dual-element sensor gives each element its own two-wire cable but allows both to share one outer sheath, so a crushed or heat-damaged cable can affect both channels. Volvo Truck lets both brake ECUs supply the sensor through a power multiplexer that switches over when one ECU fails. Aumovio, Continental's former automotive arm, markets the dual sensor with two electrically isolated signals under ISO 26262, so the second channel must stay separate. No carmaker publishes C0654; repair the cable or replace the sensor.
C0654 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of C0654
- Warning for brake or driver assistance system
- Possibly both speed signals of the wheel affected
Common causes of C0654
- Most likelySensor B line shorted to battery voltage
- PossibleShort between the two channels in a shared cable sheath
- Less likelyInternal fault in the second sensing channel
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Lf wss bSensor wiring
What each part of C0654 means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 54 | The exact fault in that area. |
What to do next
- Note C0654 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 C0654
What does C0654 mean?
C0654 means "Left Front Wheel Speed Sensor B Circuit High". Here the circuit of the second left front sensor reads above its permitted level, typically a short to the battery feed or to the supply of another channel. It is a generic code, so it means the same on every make.
Is it safe to drive with C0654?
Drive gently and only to a workshop. With C0654 the car can go into limp mode (reduced power) to protect itself.
Will C0654 fail an emissions test?
C0654 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 C0654 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. This is a job for a workshop.
Will C0654 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.