Can I replace a wheel speed sensor myself?

Wheel speed sensor replacement is a moderate DIY job. The sensor is usually held by a single bolt at the wheel hub. The main challenges are seized bolts and routing the wiring harness. A scan tool is needed afterward to clear codes.

How much does a wheel speed sensor replacement cost?

A wheel speed sensor replacement typically costs $100-$300 including parts and labor. The sensor itself costs $30-$100, with labor adding $70-$200 depending on accessibility and whether the sensor is seized.

C0040

ABS/TCS Brake Pressure Sensor Circuit

Severesensor

Overview

The C0040 diagnostic trouble code means the chassis control module has identified a abs/tcs brake pressure sensor circuit problem. This code indicates that a chassis sensor or its circuit is not providing expected readings to the ABS/stability control system. Accurate sensor data is essential for the proper operation of anti-lock brakes, traction control, and electronic stability control, and a fault in this circuit can cause these safety systems to be disabled.

Symptoms

Traction control warning light on
Speedometer reading erratically or showing zero
Vehicle pulls to one side during braking
Unusual clicking or grinding noise from wheel area

Common Causes

Faulty wheel speed sensor
Faulty steering angle sensor
Contaminated or worn brake fluid level sensor
Failed yaw rate or lateral accelerometer sensor

Diagnosis Steps

1Connect an OBD-II scanner and read all stored chassis trouble codes and freeze frame data
2Monitor wheel speed sensor signals using scan tool live data while driving
3Inspect the affected sensor and its wiring connector for damage or corrosion
4Check the sensor air gap and tone ring for damage, debris, or excessive wear
5Test the sensor resistance and voltage output with a multimeter; compare to specifications

Estimated Repair Cost

$100 — $500

Cost varies by vehicle, location, and repair shop. Includes parts and labor.

Commonly Affected Vehicles

Chevrolet EquinoxHyundai ElantraToyota CorollaToyota RAV4

Related Codes

C0083 C0020 C0146

More Sensor Codes

P0070Ambient Air Temperature Sensor Circuit

Low

P0071Ambient Air Temperature Sensor Range/Performance

Low

P0072Ambient Air Temperature Sensor Circuit Low

Low

P0073Ambient Air Temperature Sensor Circuit High

Low

P0074Ambient Air Temperature Sensor Circuit Intermittent

Low

P0095Intake Air Temperature Sensor 2 Circuit

Low

Frequently Asked Questions

The most common causes are a faulty sensor, damaged tone ring, excessive air gap, metallic debris on the sensor tip, corroded wiring, or a worn wheel bearing that allows the sensor to lose alignment with the tone ring.