Chassis, generic

C0511 Left Rear Wheel Speed Sensor A Correlation

Check engine lightOn

EmissionsNot relevant

Drive cycleRequired

Limp modePossible

C0511 means the left rear speed does not match what the other three wheels report. In GM's 19OBDG03D tables four monitors feed it: missing sensor (this wheel below 1.5 km/h while the rest exceed 6 km/h, 3 to 120 s), dropout (no edges for 150 ms after a valid reading above 30 km/h, with thresholds that depend on axle and brake pedal), fast missing (counted from key-on until 15 km/h is first reached) and too fast (this wheel faster than 6 km/h with the others standing, 40 ms). All are Type A. Mitsubishi calls C1065-64 its C0511 and blames a wrong tire size, checked between 10 and 60 km/h. GM bulletin PIT5950 for the 2019–2023 Silverado 1500 lists C0511 among codes that keep returning after a front sensor of the wrong side was fitted.

Likely causes

Left rear tire of a different size or heavily worn compared with the others

Demagnetized encoder or damaged tone ring at the left rear

Wrong sensor fitted after a repair (GM PIT5950)

Symptoms

ABS and stability lamps on after setting off or at moderate speed
Speedometer and driver aids act up after a tire change

Repair estimate

DifficultyEasyDIY possible

Parts and labour€0–400

Time0.3–2 h

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

Parts involved

wss lrtone ring lrtires

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