Chassis, generic

C0510 Left Rear Wheel Speed Sensor A Intermittent/Erratic

Check engine lightOn

EmissionsNot relevant

Drive cycleRequired

Limp modePossible

C0510 flags a left rear speed signal that jumps instead of changing smoothly. GM's 19OBDG03D EBCM logic counts every moment in which the unfiltered wheel acceleration exceeds 491 m/s² at vehicle speeds beyond 3.58 m/s and sets the code once that tally reaches 40 s; a second path latches it within 25 ms when more than 55 edges arrive too quickly. GM names loose mounting, missing teeth on the tone ring and electromagnetic interference as causes. Mitsubishi's C1065-38 runs between 10 and 60 km/h and counts as C0510 after two trips. On the rear axle, load matters: a Stellantis STAR case for the Ram 3500 describes erratic rear sensor codes only with payload or a trailer on rough pavement, without a part fault.

Likely causes

Sensor loose in its bore or play in the rear wheel bearing

Missing or damaged teeth, rust flakes on the tone ring

Wire breaking up intermittently as the rear suspension moves

Heavy payload or trailer on rough roads (Ram 3500 case)

Symptoms

ABS or stability lamp on after bumps, railway crossings or rumble strips
Brief, unexpected ABS pulsing at the rear
Fault often gone after the next ignition cycle

Repair estimate

DifficultyMediumDIY possible

Parts and labour€0–500

Time0.5–3 h

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

Parts involved

wss lrtone ring lrsensor wiring

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