Damaged or chafed sensor signal wire shorted to voltage; Corroded or pushed-back terminal in the sensor connector; Failed wheel speed sensor (internal short to voltage); Debris or metallic particles on the sensor tip or tone ring; Damaged tone ring or excessive air gap between sensor and ring; Faulty ABS control module or internal short in the module's sensor circuit

DTC codes / C06xx · Brakes, steering and suspension / C0669

C0669Right Rear Wheel Speed Sensor B Circuit High

Q: What does code C0669 mean?

Right Rear Wheel Speed Sensor B Circuit High. C0669 means the right rear wheel speed sensor circuit B is reporting a voltage above the normal range, so the anti-lock brake system (ABS) control module cannot trust that wheel's speed signal. The computer sets this code when the sensor's high-side signal wire stays at or near battery voltage instead of toggling as the wheel turns.

C0669 means the right rear wheel speed sensor circuit B is reporting a voltage above the normal range, so the anti-lock brake system (ABS) control module cannot trust that wheel's speed signal. The computer sets this code when the sensor's high-side signal wire stays at or near battery voltage instead of toggling as the wheel turns.

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 also on
Often no symptoms besides the warning light
ABS may deactivate, allowing wheel lockup during hard braking
Traction control may not engage on slippery surfaces
Speedometer or cruise control may act erratically if the signal is used for vehicle speed

Common causes, most likely first

Damaged or chafed sensor signal wire shorted to voltage
Corroded or pushed-back terminal in the sensor connector
Failed wheel speed sensor (internal short to voltage)
Debris or metallic particles on the sensor tip or tone ring
Damaged tone ring or excessive air gap between sensor and ring
Faulty ABS control module or internal short in the module's sensor circuit

How to diagnose and fix it

Inspect the sensor connector and wiring for corrosion, chafing, or contact with a voltage source
Check the sensor's air gap and clean any metallic debris from the sensor tip and tone ring
Measure sensor circuit voltage with a multimeter to confirm a short to voltage
Disconnect the sensor and check for battery voltage on the signal wire with the key on
Test the sensor's resistance and compare to the manufacturer's specification
Replace the wheel speed sensor if it fails electrical or physical inspection
Repair or replace damaged wiring and clear the code, then verify with a road test

Before you replace the ABS module

A shorted sensor wire often rubs through near the wheel well or suspension flex point, so inspect the harness along its full length rather than only at the connector.
Metallic debris from a worn bearing or brake dust can bridge the sensor gap and cause a high-voltage signal that mimics a failed sensor.
A faulty ABS module can set this code even when the sensor and wiring test good, so always verify the circuit before condemning the module.
After replacing a sensor, the ABS module may need a calibration or self-test drive cycle before the light clears.
This code can appear intermittently if the wiring short only occurs over bumps or during suspension movement.

Can I keep driving with C0669?

You can usually drive the vehicle, but the ABS and traction control systems may be disabled, so allow extra braking distance and avoid slippery or loose surfaces. Have the fault diagnosed soon, especially if the warning light is accompanied by brake pedal pulsation or pulling.

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.