Code C0667 indicates that the Anti-lock Brake System (ABS) control module has detected a range or performance issue with the right rear wheel speed sensor circuit. This means the signal from this sensor is either out of its expected operating limits or does not logically correlate with the other wheel speed sensors during normal driving.
The sensor itself has an internal failure causing an out-of-range, degraded, or intermittent signal to the ABS module.
Corroded, damaged, or disconnected wiring and connectors at the right rear wheel cause high resistance or an open circuit.
A cracked, missing, or misaligned tone ring (reluctor ring) disrupts the magnetic field, causing a poor signal to the sensor.
Metallic debris or shavings stuck to the magnetic tip of the sensor interfere with reading the tone ring properly.
The internal circuitry of the ABS module fails to process the sensor signal correctly, though this is rare.
You can usually drive the vehicle, but the ABS and traction or stability control systems will likely be disabled, meaning you lose those safety features. It should be diagnosed and repaired soon.
No, it rarely means the ABS module is faulty. The most common causes are a failed wheel speed sensor, damaged wiring, or a broken tone ring. The ABS module is the least likely cause.
Replacing the sensor is the most common fix, but it is not guaranteed. Wiring problems, connector corrosion, or a damaged tone ring can also trigger this code, so proper diagnosis is necessary before replacing parts.
Some mechanics may incorrectly assume the computer is failing to read the sensor, but control module failure is extremely rare for C0667. Always rule out the sensor, wiring, and tone ring first, as replacing the computer is almost never the fix.