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DTC codes / C06xx · Brakes, steering and suspension / C0667

C0667Right Rear Wheel Speed Sensor B Range/Performance

C0667 means the anti-lock brake system (ABS) module has detected an abnormal signal range or performance problem from the right rear wheel speed sensor circuit. The computer compares the sensor's signal against expected values and the other wheel sensors, and it flags this code when the right rear signal is erratic, out of range, or inconsistent with vehicle speed.

SystemChassis
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaBrakes, steering and suspension

Symptoms you may notice

  • Anti-lock brake system (ABS) warning light illuminated on the dashboard
  • Traction control or stability control warning light also on, since these systems share wheel speed data
  • ABS may deactivate, leaving normal hydraulic braking but no anti-lock assistance during hard stops
  • Speedometer or odometer may read erratically if the affected sensor feeds the speed display
  • Sometimes no symptoms besides the warning light, especially if the fault is intermittent
  • Momentary wheel lockup or pulsation during hard braking in low-traction conditions

Common causes, most likely first

  1. Damaged or corroded right rear wheel speed sensor wiring harness or connector
  2. Debris, metal shavings, or rust buildup on the sensor tip or tone ring
  3. Worn, cracked, or missing teeth on the right rear tone ring or reluctor wheel
  4. Failing right rear wheel speed sensor itself
  5. Excessive wheel bearing play or hub runout altering the sensor air gap
  6. Water intrusion or road salt contamination in the sensor connector
  7. ABS module internal fault or software issue affecting the right rear input channel

How to diagnose and fix it

  1. Inspect the right rear sensor, connector, and wiring for physical damage, corrosion, or loose pins
  2. Clean the sensor tip and tone ring of metal debris, rust, and dirt, then clear the code and road test
  3. Check the tone ring for cracks, missing teeth, or runout by rotating the wheel and observing the ring
  4. Measure the sensor air gap and compare it to specification, checking wheel bearing play at the same time
  5. Back-probe the sensor connector and measure resistance or AC voltage while spinning the wheel by hand
  6. Scope the sensor signal at the ABS module connector to confirm a clean waveform before condemning the module
  7. Replace the faulty sensor, harness, or tone ring as indicated, then clear codes and verify with a road test

What a wheel speed code often hides

  • A dirty or rust-contaminated tone ring is one of the most common causes of a range/performance code, and cleaning it often resolves the fault without any parts replacement.
  • A worn wheel bearing can change the sensor air gap just enough to trigger this code even when the sensor and tone ring look fine, so always check bearing play.
  • This code does not automatically mean the sensor is bad; wiring chafing near the rear suspension and water intrusion in the connector are frequent culprits that a parts swap will not fix.
  • Intermittent faults often set only during certain driving conditions such as turning, bumps, or wet weather, so a static bench test of the sensor can pass while the fault is still present.
  • The ABS module compares all four wheel speeds, so a mismatched tire size or severely underinflated tire on the right rear can produce a performance code without any electrical fault.

Can I keep driving with C0667?

The vehicle remains safe to drive under normal conditions because base hydraulic braking is unaffected, but avoid hard braking or low-traction situations where ABS would be needed. Have the fault diagnosed promptly, since traction and stability control are also disabled while the light is on.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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