Chassis, generic

C0557 Left Rear Wheel Speed Sensor A Incorrect Component Installed

Check engine lightOn
EmissionsNot relevant
Drive cycleRequired
Limp modePossible

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.

Likely causes

Wrong or other-side sensor fitted at the left rear
ABS module software misjudges the sensor (fixed by reprogramming)
Rear sensor connectors swapped left and right

Symptoms

  • Several brake system warnings at start-up
  • ABS and stability control unavailable
  • Check-engine lamp on some models

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–250
Time0.3–1.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

wss lr

Related codes

C0555C0556C0558C0037C050CC0510

References: mitsubishitechinfo.com, static.nhtsa.gov, static.nhtsa.gov.