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DTC codes / C00xx · Brakes, steering and suspension / C0046

C0046Right Front Wheel Speed Sensor Circuit Intermittent

C0046 means the antilock braking system (ABS) module has detected an intermittent signal from the right front wheel speed sensor circuit, so the signal drops out or becomes erratic rather than failing completely. The computer sets this code when the right front wheel speed reading momentarily disagrees with the other three wheels or disappears during driving.

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

Symptoms you may notice

  • ABS warning light illuminated on the dashboard, often intermittently
  • Traction control or stability control warning light also on, since those systems share wheel speed data
  • ABS may deactivate and the brake pedal may feel normal during ordinary stops
  • Momentary wheel lockup or ABS kickback during hard braking on slippery surfaces
  • Speedometer needle flicker or cruise control dropping out if the signal is used for vehicle speed
  • Often no symptoms besides the warning light, especially in dry, gentle driving

Common causes, most likely first

  1. Damaged or chafed wheel speed sensor wiring near the right front knuckle or strut
  2. Corroded or loose electrical connector at the right front wheel speed sensor
  3. Debris, metallic particles, or rust buildup on the sensor tip or tone ring
  4. Worn or cracked tone ring (reluctor ring) on the right front hub or CV joint
  5. Excessive wheel bearing play or hub runout causing an erratic air gap
  6. Failed right front wheel speed sensor itself, often from heat or vibration
  7. Water intrusion or internal fault in the ABS module connector or harness

How to diagnose and fix it

  1. Scan all modules and record freeze-frame data to confirm the fault is intermittent and isolated to the right front sensor
  2. Inspect the right front sensor wiring and connector for chafing, corrosion, or loose pins, and repair as needed
  3. Remove the sensor and clean the mounting surface and tone ring of debris, rust, or metallic particles
  4. Check the tone ring for cracks, missing teeth, or runout, and inspect the wheel bearing for play
  5. Measure sensor resistance and AC voltage output while spinning the wheel, comparing to the left front sensor
  6. Perform a wiggle test on the harness while watching live wheel speed data to expose intermittent opens
  7. Replace the right front wheel speed sensor or hub assembly if electrical and mechanical checks confirm a failed component, then clear codes and verify

Intermittent codes hide in plain sight

  • A wheel speed sensor can pass a static resistance test and still drop out only when the suspension moves, so a wiggle test of the harness while watching live data is essential.
  • Metallic debris from a worn brake rotor or hub can collect on the sensor magnet and cause an intermittent signal that looks like a failed sensor.
  • The ABS module often shares wheel speed data with the speedometer, cruise control, and transmission, so a right front sensor fault can set unrelated-looking codes in other modules.
  • A loose or worn wheel bearing changes the air gap as the wheel rotates, producing an intermittent signal that a new sensor will not fix.
  • Some vehicles set C0046 only after several drive cycles, so the light may clear on its own and mislead a driver into thinking the problem is gone.

Can I keep driving with C0046?

You can usually drive cautiously to a repair shop, but avoid hard braking, towing, or slippery roads because the ABS and traction control may not function. If the warning light is accompanied by a soft or long brake pedal, stop driving and have the vehicle towed.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

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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