C0661

Left Rear Wheel Speed Sensor B Circuit Low

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

ABS/ESP indicator is on
Disabling the anti-lock braking system
Incorrect operation of cruise control
Errors in other systems

Causes

Wheel speed sensor malfunction
Open or shorted wiring harness
Problems with the sensor connector
ABS module malfunction

How to Fix

Check the integrity of the wiring harness and sensor connector
Measure the resistance of the wheel speed sensor
Check the sensor signal using an oscilloscope
Replace the wheel speed sensor if necessary
Check and clean magnetic ring (if applicable)
Check the power and ground of the sensor circuit

Related codes

C0660 C0662 C0663 C0065