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DTC codes / C05xx · Brakes, steering and suspension / C0516

C0516Right Rear Wheel Speed Sensor A Intermittent/Erratic

C0516 means the anti-lock brake system (ABS) module has detected an intermittent or erratic signal from the right rear wheel speed sensor, identified as sensor A. The computer sees the signal drop out, spike, or become inconsistent when the vehicle is moving, so it logs the fault and may disable ABS and traction control.

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

Symptoms you may notice

  • ABS warning light illuminated on the dashboard, often accompanied by the traction control light
  • Traction control or stability control system disabled, with a message on the driver information display
  • Intermittent or erratic speedometer behavior if the right rear sensor also feeds the speedometer
  • Momentary wheel lockup or ABS activation at low speeds when the signal drops out
  • Often no symptoms besides the warning light, especially if the fault is brief and the module retains normal operation
  • A stored code that returns after clearing, sometimes only after driving over bumps or at certain speeds

Common causes, most likely first

  1. Damaged or chafed wiring harness at the right rear wheel, commonly where it flexes near the suspension or passes through a grommet
  2. Corroded or loose electrical connector at the right rear wheel speed sensor or at the ABS module
  3. Debris, metal shavings, or rust buildup on the sensor tip or the tone ring, disturbing the magnetic signal
  4. A cracked or damaged tone ring (reluctor ring) on the right rear hub or axle, causing an uneven pulse pattern
  5. Failing wheel speed sensor that works intermittently when hot, cold, or vibrating
  6. Excessive wheel bearing play or hub runout that changes the sensor-to-ring air gap as the wheel turns
  7. Water intrusion into the sensor connector or harness, leading to intermittent shorts or high resistance

How to diagnose and fix it

  1. Scan all modules for codes and record freeze-frame data to confirm the fault is specific to the right rear sensor and not a system-wide communication issue
  2. Visually inspect the right rear sensor, connector, and harness for chafing, corrosion, or loose pins, and repair any damaged wiring first
  3. Remove the sensor and clean the tip and tone ring of metal debris, rust, or grease, then reinstall and clear the code for a road test
  4. Check the tone ring for cracks, missing teeth, or runout by rotating the wheel and observing the ring, replacing the hub or axle if damaged
  5. Measure the sensor air gap and check wheel bearing play at the right rear wheel, correcting any excessive movement
  6. Perform a live data road test watching right rear wheel speed against the other three wheels to catch dropouts or erratic readings
  7. If the signal remains erratic after wiring and ring checks, replace the right rear wheel speed sensor and verify the repair with a road test

Why an intermittent wheel speed code misleads

  • A wheel speed sensor can test perfectly with a multimeter at rest and still fail intermittently when vibration or heat changes the internal connection, so a static resistance check alone is not proof of a good sensor.
  • Debris on the sensor tip or tone ring is one of the most common causes of an erratic signal, and cleaning it often resolves the code without any parts replacement.
  • The ABS module may set C0516 from a single brief dropout, so the code does not always mean the sensor is failing; a loose connector or chafed wire can produce the same stored fault.
  • On vehicles where the right rear sensor also feeds the speedometer or transmission shift logic, an intermittent signal can cause drivability complaints that seem unrelated to the ABS system.
  • After replacing a sensor or repairing wiring, the ABS module may need a short drive cycle at speeds above a set threshold before it will clear the light and re-enable ABS, so a stationary code clear is not a complete repair verification.

Can I keep driving with C0516?

The vehicle remains drivable with C0516 because the base brakes work normally, but ABS and traction control may be disabled, so avoid hard braking, slippery surfaces, and towing until the fault is repaired. If the warning light is accompanied by a brake pedal pulsation or any sign of brake drag, stop driving and have the system inspected immediately.

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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