Chassis, generic

C0501 Left Front Wheel Speed Sensor A Range/Performance

Check engine lightOn

EmissionsNot relevant

Drive cycleRequired

Limp modePossible

C0501 means the left front speed signal is present but does not fit the situation. GM shows how differently this is judged: its 2016 hybrid tables flag the code when that wheel reads 0 mph while the other three exceed 7.45 mph at a vehicle speed above 11.8 mph (Type A), whereas the 2023 tables test the air gap and set it when magnetic flux stays below 2.2 mT for at least five wheel turns, as Type B with two trips. Mitsubishi derives C1061-92, its C0501, from a speed gap to the other wheels between 10 and 60 km/h and names wrong tire sizes and the sensor rotor. Stellantis reprogrammed engine controllers of the 2017 Cherokee 3.2 because C0501 was being stored falsely there, adding that on that model it does not light the MIL.

Likely causes

Sensor not fully seated or air gap to the tone ring too large

Tire on the left front differs in size from the specified one

Tone ring or magnetic encoder damaged or dirty

Control module software sets the code falsely (Stellantis reflash)

Symptoms

ABS and stability warning lamps on after driving, not at key-on
Unexpected ABS or traction control intervention at low speed
Code stored in the engine controller without MIL (Stellantis)

Repair estimate

DifficultyMediumDIY possible

Parts and labour€0–500

Time0.3–2.5 h

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

Parts involved

wss lftone ring lftires

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