Chassis, generic

C050B Right Front Wheel Speed Sensor A Correlation

Check engine lightOn
EmissionsNot relevant
Drive cycleRequired
Limp modePossible

C050B is the correlation code for the right front wheel. GM's 2025 tables (25OBDG04A) rate it Type B, so the MIL waits for a second trip, and add a check not found under C0505 in the 2019 tables: the brake module compares the switching state it requests from the sensor supply driver with the state reported back, an internal module fault rather than a sensor problem. The plausibility checks stay: from start-up to 15 km/h a wheel below 1.2 km/h counts as missing, and if only this wheel exceeds 6 km/h while another stays under 1.5 km/h, a 40 s wait precedes storing the fault. Mitsubishi lists C1063-64 as C050B, naming tire size and sensor rotor. Bosch's active sensors resolve speed down to about 0.1 km/h, so a dead channel shows up early.

Likely causes

Right front tire of a different size or circumference
Sensor-to-ring gap out of tolerance or demagnetized encoder
Internal fault in the ABS module's sensor supply switch (GM)

Symptoms

  • ABS/ESC lamps after the second drive with the fault
  • Stability and traction control unavailable, normal braking retained

Repair estimate

DifficultyEasyDIY possible
Parts and labour€0–450
Time0.3–2 h

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

Parts involved

wss rftone ring rftiresabs control module

Related codes

C0506C0507C050AC0505C053CC0556

References: gsi.ext.gm.com, mitsubishitechinfo.com, bosch-mobility.com.