C051BRight Rear Wheel Speed Sensor - Mechanical
- Generic OBD-II code · Chassis
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- C051B covers a mechanical defect at the right rear wheel. No public manufacturer document defines when it is set; the cases known from bulletins carry other codes. They still show what to inspect at a right rear wheel. GM's 2018 program 18316 for Express and Savana vans found that axle vibration over rumble strips shook the right rear sensor signal into erratic values, and changed the brake module calibration rather than any part. Ford's message on the F-53 chassis covers tone rings deformed while hub and rotor were refitted. Infiniti's sensor bulletin adds loose or corroded tone wheels and bearings to the list. A mechanical code therefore calls for a look at encoder, bearing and sensor fit before electrical testing.
- What you may notice
- ABS, stability and traction lamps after rough stretches
- Driver aids unavailable until the next ignition cycle
- Likely causes
- PossibleRight rear tone ring deformed or corroded
- PossibleRight rear hub bearing loose or worn
- RareAxle vibration disturbing the signal on rough surfaces
- Repair
- Medium · Often possible to do yourself.Typical cost: €0 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.