Chassis, generic

C050E Left Rear Wheel Speed Sensor A Circuit Low

Check engine lightOn

EmissionsNot relevant

Drive cycleNot required

Limp modePossible

C050E reports the left rear sensor circuit pulled below its expected level. GM's 2019 EBCM tables (19OBDG03D) let the Polaris ASIC set it for three separate findings: an open sensor bit, a grounded low side, looked for only at start-up or once codes have been cleared, and sensor undervoltage, which needs only 20 ms; all are Type A with the MIL. The 2025 tables quantify the open-sensor bit as high-side current under 3.5 mA. Mitsubishi's C1065-11, its C050E, covers both short and open circuits and is one of the few wheel sensor faults there that also turns on the electric parking brake warning next to the ASC, ABS and engine lamps. A wire grounded against the rear subframe or a water-logged connector is the usual cause.

Likely causes

Sensor wire grounded against the subframe or body

Moisture or corrosion in the left rear connector

Left rear sensor shorted internally

Low supply voltage at the brake module (fuse, battery)

Symptoms

ABS, stability and electric parking brake warnings on (Mitsubishi)
ABS and stability control disabled for the rest of the trip

Repair estimate

DifficultyMediumDIY possible

Parts and labour€30–400

Time0.5–2.5 h

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

Parts involved

wss lrsensor wiring

References: gsi.ext.gm.com, gsi.ext.gm.com, mitsubishitechinfo.com.