What it means
Right Front Wheel Speed Sensor B Correlation: the value does not correlate with the related sensor or expected pattern. Wheel-speed signals feed ABS, ESC, traction control and the speedometer.
At a glance
- Usually lights the ABS or stability-control warning light
- The engine or gearbox may go into limp mode
How it works
Right front wheel speed sensor B reports wheel rotation to the ABS module, which compares it with related wheel speeds and expected patterns. This code sets when the right front B value does not agree with those references, pointing to a signal, encoder, wiring, or sensor-gap issue.
Common causes
Most likely first.
- Wheel speed sensor B signal fault
- Damaged or contaminated tone ring or encoder
- Loose or damaged sensor wiring or connector
- Incorrect sensor installation or excessive sensor gap
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
How to diagnose it
- Save the ABS freeze-frame data and compare all wheel-speed readings in live data during slow straight-line movement to identify how right front B differs.
- Inspect the right front sensor B connector and wiring for looseness, damage, or contamination.
- Check the right front encoder or tone ring for damage or debris that could make its pulse pattern disagree with the other wheels.
- Verify sensor B is the correct part, fully seated, and mounted with a gap matching the manufacturer's specification.
- If those checks pass, test the sensor B signal and circuit integrity, comparing results with the manufacturer's specification before diagnosing the ABS module.
Common fixes
- Clean debris from the right front encoder if it is otherwise sound.
- Repair loose or damaged sensor B wiring and connector terminals.
- Correct sensor B installation and gap to the manufacturer's specification.
- Replace a damaged encoder or a sensor B that fails signal testing.
Can I keep driving?
Use caution because ABS and stability or traction control may be unavailable when wheel speeds disagree. Avoid slippery surfaces and allow extra stopping distance until the mismatch is resolved.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.