C0505 code meaning
Left Front Wheel Speed Sensor A Correlation
Chassis system Generic code C05xx codes Check engine light
What C0505 means
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.
C0505 at a glance
- Check engine lightYes, usually on
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyEasy, DIY possible
- Typical labor0.3 to 2 hours
- Clears after repairAfter a drive cycle
Symptoms of C0505
- ABS/ESC lamps after a drive, often following a tire change
- Traction control intervenes although wheels are not slipping
Common causes of C0505
- Most likelyTire of a different size or heavily worn tire on the left front
- PossibleSensor not seated correctly, air gap out of tolerance
- Less likelyDemagnetized or damaged magnetic encoder ring
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Wss lfTone ring lfTires
What each part of C0505 means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 05 | The exact fault in that area. |
What to do next
- Note C0505 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 C0505
What does C0505 mean?
C0505 means "Left Front Wheel Speed Sensor A Correlation". C0505 says the left front wheel speed is out of step with the other wheels although the circuit tests pass. It is a generic code, so it means the same on every make.
Is it safe to drive with C0505?
Drive gently and only to a workshop. With C0505 the car can go into limp mode (reduced power) to protect itself.
Will C0505 fail an emissions test?
C0505 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 C0505 to fix?
Difficulty: easy. A typical repair takes 0.3 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will C0505 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.