Right rear wheel speed sensor unplugged or faulty; Damaged or corroded wiring harness at the sensor connector; Open circuit in the sensor signal or ground wire; Short to voltage on the signal circuit; Debris or metal particles on the sensor tip or tone ring; Damaged tone ring or reluctor wheel; Faulty ABS control module (less common)

DTC codes / C00xx · Brakes, steering and suspension / C0063

C0063Right Rear Wheel Speed Sensor Circuit High

Q: What does code C0063 mean?

Right Rear Wheel Speed Sensor Circuit High. C0063 indicates the anti-lock brake system (ABS) control module has detected an abnormally high voltage on the right rear wheel speed sensor circuit, which usually means the sensor signal is missing, shorted to power, or the circuit is open. The module sets this code when the signal voltage exceeds the expected range for the current wheel speed, often because the sensor is unplugged or damaged.

C0063 indicates the anti-lock brake system (ABS) control module has detected an abnormally high voltage on the right rear wheel speed sensor circuit, which usually means the sensor signal is missing, shorted to power, or the circuit is open. The module sets this code when the signal voltage exceeds the expected range for the current wheel speed, often because the sensor is unplugged or damaged.

SystemChassis

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaBrakes, steering and suspension

Symptoms you may notice

ABS warning light illuminated on the dashboard
Traction control or stability control warning light may also be on
Often no symptoms besides the warning light
ABS may be disabled, leading to wheel lockup during hard braking
Traction control may not function, causing wheel spin on slippery surfaces
Speedometer may read erratically if the affected sensor is used for vehicle speed

Common causes, most likely first

Right rear wheel speed sensor unplugged or faulty
Damaged or corroded wiring harness at the sensor connector
Open circuit in the sensor signal or ground wire
Short to voltage on the signal circuit
Debris or metal particles on the sensor tip or tone ring
Damaged tone ring or reluctor wheel
Faulty ABS control module (less common)

How to diagnose and fix it

Inspect the right rear wheel speed sensor connector for looseness, corrosion, or damage
Check the sensor wiring harness for chafing, breaks, or shorts, especially near suspension components
Measure sensor resistance and compare to manufacturer specifications
Clean the sensor tip and tone ring of any debris or metal shavings
Inspect the tone ring for cracks, missing teeth, or damage
Use a scan tool to monitor wheel speed sensor data while rotating the wheel to verify signal
If all else checks out, test the ABS control module or replace the sensor as needed

Common Oversights in C0063 Diagnosis

A loose or corroded connector at the right rear sensor is a frequent cause that can mimic a failed sensor, so always inspect the plug before replacing parts.
The code can be set by a simple open circuit from a broken wire in the harness, often caused by flexing near the suspension, which is easily missed if only the sensor is checked.
Metal debris from a worn bearing or brake dust can accumulate on the sensor tip and disrupt the signal, producing a high voltage code without any sensor failure.
On some vehicles, a failing wheel bearing can damage the tone ring or sensor, so ignoring mechanical noises may lead to repeat failures.
The ABS module itself rarely fails, but a shorted sensor circuit can damage the module, so always repair wiring faults before installing a new module.

Can I keep driving with C0063?

You can usually drive the vehicle, but the ABS and traction control systems may be disabled, increasing stopping distances in emergencies and reducing stability on slippery roads. Avoid hard braking and slippery conditions until the fault is repaired.

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.