C0040: Right Front Wheel Speed Sensor Circuit
16 vehicles · 8 makes
C0040 is an OBD-II diagnostic trouble code meaning “Right Front Wheel Speed Sensor Circuit.” The right front wheel speed sensor has a circuit fault. This code appears across 16 vehicle models from 8 manufacturers.
Common Causes
Diagnostic Tools
To diagnose C0040, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
Vehicles Affected (16)
Unwanted ABS Activation Increasing Stopping Distance
Front Wheel Hub Bearing Failure Triggering ABS Warning and Growling Noise
Front Wheel Bearing and Hub Assembly Failure Triggering ABS/Traction Warnings
StabiliTrak and ABS False Activation from Wheel Speed Sensors
ABS Module / Wheel Speed Sensor Faults Causing ABS Warning and Intermittent Brake Activation
Front Wheel Bearing and Hub Assembly Failure Causing Growling Noise and ABS Warning Lights
Premature Front Wheel Hub Bearing Failure
Electronic Brake Control Module Failure
Front Hub/Bearing Assembly Failure Causing ABS Activation and Wheel Noise
Front Hub Bearing Assembly Failure Causing ABS Activation, Noise, and Wheel Play
Front Hub Bearing and ABS Wheel Speed Sensor Corrosion Causing Unwanted ABS Activation
FAQ
What does C0040 mean?
C0040 stands for "Right Front Wheel Speed Sensor Circuit." The right front wheel speed sensor has a circuit fault.
What are the most common causes of C0040?
The most common causes of C0040 are: Failed wheel speed sensor, Wiring damage, Corroded connector, Tone ring damage, Sensor air gap too large. The specific cause varies by vehicle.
How much does it cost to fix C0040?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by C0040?
Au7o has documented C0040 across 16 vehicle models from 8 manufacturers: Chevrolet, Chrysler, Ford, GMC, Honda, Jeep, Kia, Nissan.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.