Chassis, generic

C050A Right Front Wheel Speed Sensor A Intermittent/Erratic

Check engine lightOn

EmissionsNot relevant

Drive cycleRequired

Limp modePossible

C050A is the erratic-signal code for the right front sensor. GM's 2019 tables show how this is judged: an unfiltered wheel acceleration above 491 m/s² feeds a counter that latches the fault at 40 s and decays again on clean readings, so only persistently unrealistic jumps set it; a separate check trips when the edge count exceeds 55 (25 ms). Listed causes are a loosely mounted sensor, missing tone-ring teeth and electromagnetic interference. GM preliminary information PIT5707 for 2020 Silverado and Sierra HD trucks found metal debris on the front reluctor ring; its labor time for removing the hub and cleaning is 1.1 h. HELLA adds heavy dirt and increased bearing play as typical sensor faults. Mitsubishi assigns C1063-38 to C050A with a two-trip MIL.

Likely causes

Metal debris or heavy dirt on the right front reluctor ring

Missing tone-ring teeth or excessive wheel bearing play

Electromagnetic interference or intermittent contact in the harness

Symptoms

ABS lamp and stability system message that appear and disappear
Pulsing brake pedal or ABS action at low speed without wheel lock

Repair estimate

DifficultyMediumDIY possible

Parts and labour€0–600

Time0.5–2.5 h

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

Parts involved

wss rftone ring rfsensor wiring

References: gsi.ext.gm.com, static.nhtsa.gov, mitsubishitechinfo.com, hella.com.