C1233: Wheel Speed Sensor Input Signal Missing (Front)
3 vehicles · 1 makes · $200-$700 repair
Most Reported On
C1233 is an OBD-II diagnostic trouble code meaning “Wheel Speed Sensor Input Signal Missing (Front).” C1233 is a manufacturer-specific chassis code meaning the ABS/control module lost the input signal from a front wheel speed sensor. (Note: Ford/Mazda define it as the left-front sensor, while GM uses it for the right-front, so the exact wheel depends on the manufacturer.) Wheel speed sensors report each wheel's rotation to the ABS, traction, and stability systems. When a signal goes missing, the module disables ABS and traction/stability control and turns on the related warning lights. Normal braking still works, but anti-lock and stability assistance are offline. This code is most commonly reported on 2000-2005 Ford Excursion, 2002-2010 Ford Explorer, and 2005-2007 Ford Five Hundred, with repair costs ranging from $200 to $700.
Common Causes
Typical Repair Cost
Based on 3 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose C1233, 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 (3)
FAQ
What does C1233 mean?
C1233 stands for "Wheel Speed Sensor Input Signal Missing (Front)." C1233 is a manufacturer-specific chassis code meaning the ABS/control module lost the input signal from a front wheel speed sensor. (Note: Ford/Mazda define it as the left-front sensor, while GM uses it for the right-front, so the exact wheel depends on the manufacturer.) Wheel speed sensors report each wheel's rotation to the ABS, traction, and stability systems. When a signal goes missing, the module disables ABS and traction/stability control and turns on the related warning lights. Normal braking still works, but anti-lock and stability assistance are offline.
What are the most common causes of C1233?
The most common causes of C1233 are: Damaged or corroded wheel speed sensor wiring near the sensor, Failed front wheel speed sensor, Corroded or loose sensor connector, Damaged tone/reluctor ring or excessive air gap, Debris or rust buildup at the sensor, ABS module fault or loss of module communication, Open circuit from harness damage due to suspension movement. The specific cause varies by vehicle.
How much does it cost to fix C1233?
Repair costs for C1233 range from $200 to $700, depending on the vehicle and root cause.
Which vehicles are affected by C1233?
Au7o has documented C1233 across 3 vehicle models from 1 manufacturers: Ford.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.