C0557 code meaning
Left Rear Wheel Speed Sensor A Incorrect Component Installed
Chassis system Generic code C05xx codes Check engine light
What C0557 means
C0557 concerns the speed sensor at the left rear wheel: its signal exists, but the ABS module judges the fitted part as not matching. Mitsubishi lists C1065-4A on the 2023 Outlander PHEV as C0557 (sensor in the wrong position, up to 3 s, MIL after two trips). Ford reports the same fault type with its base code plus failure byte, C0037:4A. On 2025 Bronco and Ranger, special service messages 53875 and 53988 (plus their Ranger counterparts) show it together with C003A:4A at start-up as an ABS software issue; replacing sensors or the module does not help, the fix is reprogramming the ABS module. So before buying a sensor, compare part numbers and look for software bulletins. Unlike C050C (circuit open) or C0510 (erratic), the wiring is usually fine here.
C0557 at a glance
- Check engine lightYes, usually on
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.3 to 1.5 hours
- Clears after repairAfter a drive cycle
Symptoms of C0557
- Several brake system warnings at start-up
- ABS and stability control unavailable
- Check-engine lamp on some models
Common causes of C0557
- Most likelyWrong or other-side sensor fitted at the left rear
- PossibleABS module software misjudges the sensor (fixed by reprogramming)
- Less likelyRear sensor connectors swapped left and right
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Wss lr
What each part of C0557 means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 57 | The exact fault in that area. |
What to do next
- Note C0557 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 C0557
What does C0557 mean?
C0557 means "Left Rear Wheel Speed Sensor A Incorrect Component Installed". C0557 concerns the speed sensor at the left rear wheel: its signal exists, but the ABS module judges the fitted part as not matching. It is a generic code, so it means the same on every make.
Is it safe to drive with C0557?
Drive gently and only to a workshop. With C0557 the car can go into limp mode (reduced power) to protect itself.
Will C0557 fail an emissions test?
C0557 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 C0557 to fix?
Difficulty: medium. A typical repair takes 0.3 to 1.5 hours of work. This is a job for a workshop.
Will C0557 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.