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C0506 — Right Front Wheel Speed Sensor Circuitopen

Generic OBD-II · all makesChassis

Code C0506 indicates the anti-lock brake system module has detected an open electrical circuit in the right front wheel speed sensor. This prevents the system from monitoring wheel speed at that corner, disabling ABS and traction control functions.

Symptoms

What causes it — most likely first

1. Damaged sensor wiring harness

Wires near the wheel well are exposed to heat, debris, and movement, leading to breaks.

2. Failed wheel speed sensor

The internal coil within the sensor can fail, creating infinite resistance.

3. Corroded electrical connector

Moisture intrusion at the sensor plug can corrode terminals and break continuity.

4. Broken wiring near ABS module

Harness damage may occur where the wiring enters the control module or chassis.

5. Loose connection at control module

Vibration can cause the main harness connector at the ABS unit to seat poorly.

6. Internal ABS module failure

Circuit board failure within the module is possible but statistically rare compared to wiring.

How it's diagnosed

  1. Visually inspect the right front sensor wiring for cuts, chafing, or corrosion
  2. Check the electrical connector for secure engagement and clean terminals
  3. Measure sensor resistance with a multimeter and compare to specifications
  4. Wiggle test the harness while monitoring resistance to find intermittent opens
  5. Trace wiring from sensor to ABS module for continuity and shorts to ground
  6. Inspect ABS module connector and pins for corrosion or damage

Code facts & related codes

SystemChassis
StandardizationSAE generic — identical on every make

Frequently asked

Can I drive with this code?

Yes, but ABS and traction control will not function, increasing stopping distances on slippery surfaces.

Do I need to replace the ABS computer?

No, this code usually indicates a wiring or sensor failure; module replacement is rarely required.

Will this affect my speedometer?

Often no, as many vehicles use a separate vehicle speed sensor, but some rely on wheel data.

Can a bad tire cause this code?

No, tire condition does not cause electrical open circuits, though mismatched sizes can cause speed mismatch codes.