ABS and brakes

C0222 — Right Front Wheel Speed Sensor Signal Erratic

Severity: medium Drive with care, to a shop

What C0222 means

The ABS control module (EBCM) constantly compares the wheel speed signals from all four wheels. For the right front wheel it detected dropouts, spikes or no signal at all. Without reliable wheel speed data the module can't tell when a wheel is locking or spinning, so it disables or limits ABS and traction control.

Symptoms

  • ABS warning light on
  • Traction control light may also come on
  • Braking feels different and ABS doesn't engage in hard stops
  • ABS light that comes and goes
  • Random traction control activation
  • Erratic or zero right front wheel speed in scan tool data

Possible causes

  1. Failed right front wheel speed sensor
  2. Damaged or shorted wiring to the sensor
  3. Poor connection or corrosion at the sensor connector
  4. Changed air gap between sensor and tone ring
  5. Damaged, rusty or dirty tone ring teeth
  6. Loose sensor mounting bolt
  7. Faulty ABS module (uncommon)

How to diagnose

  1. Scan the ABS module and look for other wheel speed codes
  2. Watch live data for right front wheel speed and compare it with the other wheels
  3. Inspect the sensor, its mounting and the wiring from the wheel to the body, especially where it flexes with steering
  4. Check the connector for corrosion, moisture and a secure latch
  5. Remove the sensor, clean off dirt and metal debris and check the air gap
  6. Inspect the tone ring for cracks, broken teeth and rust
  7. Test sensor resistance and wire continuity, or power and ground on active sensors
  8. If all is good, check the ABS module and its connector

Common fixes

  • Replace the right front wheel speed sensor
  • Repair or replace damaged wiring and connectors
  • Clean the contacts and secure the sensor properly
  • Replace a damaged tone ring or the hub bearing with integrated ring
  • Repair or replace the ABS module if confirmed faulty

Questions and answers

Can I drive with code C0222?

Yes, but carefully and with extra following distance. The regular brakes work, while ABS and traction control may be off, which matters most on wet roads.

What most often causes C0222?

Most often it's a failed sensor or damaged wiring near the wheel. Dirt, rust or damage on the tone ring and a poor connector contact are also common.

Will the code clear by itself?

The light may go out if the fault was a one-time glitch, but the code stays stored. If the cause isn't fixed, it will come back.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.