C0511 code meaning
Left Rear Wheel Speed Sensor A Correlation
Chassis system Generic code C05xx codes Check engine light
What C0511 means
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.
C0511 at a glance
- Check engine lightYes, usually on
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyEasy, DIY possible
- Typical labor0.3 to 2 hours
- Clears after repairAfter a drive cycle
Symptoms of C0511
- ABS and stability lamps on after setting off or at moderate speed
- Speedometer and driver aids act up after a tire change
Common causes of C0511
- Most likelyLeft rear tire of a different size or heavily worn compared with the others
- PossibleDemagnetized encoder or damaged tone ring at the left rear
- PossibleWrong sensor fitted after a repair (GM PIT5950)
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Wss lrTone ring lrTires
What each part of C0511 means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 11 | The exact fault in that area. |
What to do next
- Note C0511 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about C0511
What does C0511 mean?
C0511 means "Left Rear Wheel Speed Sensor A Correlation". C0511 means the left rear speed does not match what the other three wheels report. It is a generic code, so it means the same on every make.
Is it safe to drive with C0511?
Drive gently and only to a workshop. With C0511 the car can go into limp mode (reduced power) to protect itself.
Will C0511 fail an emissions test?
C0511 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is C0511 to fix?
Difficulty: easy. A typical repair takes 0.3 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will C0511 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.