C0040: Right Front Wheel Speed Sensor Circuit
17 vehicles · 9 makes · $100-$1,500 repair
Most Reported On
C0040 is an OBD-II diagnostic trouble code meaning “Right Front Wheel Speed Sensor Circuit.” This is a brake/ABS-system code. The right front wheel speed sensor measures how fast that wheel is rotating and feeds that data to the anti-lock brake, traction control, and stability control systems. C0040 means the ABS module found an electrical problem in the right front wheel speed sensor circuit — for example an open circuit, a short, or a signal that is missing or out of range. You'll normally see the ABS and traction/stability lights come on, and those systems may shut off temporarily while your regular brakes keep working. This code is most commonly reported on 2000-2007 Ford Focus, 2011-2023 Chrysler 300, and 2014-2023 GMC Sierra 1500, plus 14 other vehicles, with repair costs ranging from $100 to $1,500.
Common Causes
Typical Repair Cost
Based on 19 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
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 (17)
Unwanted ABS Activation Increasing Stopping Distance
Front Wheel Bearing and Hub Assembly Failure Triggering ABS/Traction Warnings
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
Unwanted Low-Speed ABS Activation (Corrosion) - Recall 05V379
Front Wheel Hub Bearing Failure Triggering ABS Warning and Growling Noise
StabiliTrak and ABS False Activation from Wheel Speed Sensors
Electronic Brake Control Module Failure
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." This is a brake/ABS-system code. The right front wheel speed sensor measures how fast that wheel is rotating and feeds that data to the anti-lock brake, traction control, and stability control systems. C0040 means the ABS module found an electrical problem in the right front wheel speed sensor circuit — for example an open circuit, a short, or a signal that is missing or out of range. You'll normally see the ABS and traction/stability lights come on, and those systems may shut off temporarily while your regular brakes keep working.
What are the most common causes of C0040?
The most common causes of C0040 are: Failed right front wheel speed sensor, Damaged, corroded or unplugged sensor wiring/connector, Damaged or rust-clogged tone/reluctor ring, Excessive air gap between sensor and tone ring, Wheel bearing wear affecting an integrated sensor, Water intrusion or corrosion at the connector, Faulty ABS control module (less common). The specific cause varies by vehicle.
How much does it cost to fix C0040?
Repair costs for C0040 range from $100 to $1,500, depending on the vehicle and root cause.
Which vehicles are affected by C0040?
Au7o has documented C0040 across 17 vehicle models from 9 manufacturers: Chevrolet, Chrysler, Ford, GMC, Honda, Jeep, Kia, Nissan, Pontiac.
Sources (12)
- videoYouTube Repair Video: Rear Wheel Bearing Replacement on Ford Focus
- NHTSANHTSA RCSB-19V645: Product Safety Recall N192268490 Increased Brake Pedal Effort
- NHTSANHTSA RMISC-20V055: Frequently Asked Questions for NonCompliance Recall N192268091
- mediaLemon Law Aid: 2019 Chevy Silverado & GMC Sierra Electronic Brake Module Recall
- mediaConsumer Reports: Chevrolet Silverado and GMC Sierra Pickups Recalled Again for Brake System
- RecallNHTSA Recall 20V123000 - Nissan 370Z Brake Actuator Relay Issue
- TSBNissan Technical Service Bulletin NTB14-041: Brake Actuator Relay Replacement Procedure
- NHTSANHTSA Complaints - Avalanche ABS Issues
- NHTSANHTSA Safety Recall SC284UB HECU Fuse Replacement
- ForumRecall for HECU - Kia Optima Forums
- ForumInterim Notice Safety Recall - Kia Forum
- Forumr/JeepGrandWagoneer subreddit - owner discussions including ABS/ESC warning light and wheel speed sensor issues
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.