C0505Left Front Wheel Speed Sensor A Correlation
- Generic OBD-II code · Chassis
- Turns on the check-engine light
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- C0505 says the left front wheel speed is out of step with the other wheels although the circuit tests pass. GM's 2019 tables (19OBDG03D) group several comparisons under this code: a missing sensor, meaning this wheel shows under 1.5 km/h while another exceeds 6 km/h (3 to 120 s depending on speed); a dropout check paused after sudden accelerations; a start-up check that runs until 15 km/h; and the reverse case, where only this wheel turns. Named causes are a badly seated sensor, an air gap out of tolerance and a demagnetized tone ring. Mitsubishi files speed gaps caused by non-specified tires as C1061-64 = C0505, evaluated between 10 and 60 km/h. For comparison, Toyota decides wheel sensor plausibility from about 6 mph, as FenderBender explains.
- What you may notice
- ABS/ESC lamps after a drive, often following a tire change
- Traction control intervenes although wheels are not slipping
- Likely causes
- LikelyTire of a different size or heavily worn tire on the left front
- PossibleSensor not seated correctly, air gap out of tolerance
- RareDemagnetized or damaged magnetic encoder ring
- Repair
- Easy · Often possible to do yourself.Typical cost: €0 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.