C0037: Left Rear Wheel Speed Sensor Circuit
3 vehicles · 2 makes · $120-$2,000 repair
Most Reported On
C0037 is an OBD-II diagnostic trouble code meaning “Left Rear Wheel Speed Sensor Circuit.” C0037 is a generic OBD-II chassis code indicating a fault in the left-rear wheel speed sensor circuit. This sensor reports how fast the left-rear wheel is turning to the ABS, traction control, and stability control systems. When the module loses or sees an invalid signal from this sensor, it sets the code and typically disables ABS and traction/stability control, illuminating those warning lights. Regular braking remains functional, but the anti-lock and stability features may be inactive. This code is most commonly reported on 2000-2001 Volkswagen Jetta, 2014-2021 Ford Transit Connect, and 2004-2010 Volkswagen Touareg, with repair costs ranging from $120 to $2,000.
Common Causes
Typical Repair Cost
Based on 3 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose C0037, 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 C0037 mean?
C0037 stands for "Left Rear Wheel Speed Sensor Circuit." C0037 is a generic OBD-II chassis code indicating a fault in the left-rear wheel speed sensor circuit. This sensor reports how fast the left-rear wheel is turning to the ABS, traction control, and stability control systems. When the module loses or sees an invalid signal from this sensor, it sets the code and typically disables ABS and traction/stability control, illuminating those warning lights. Regular braking remains functional, but the anti-lock and stability features may be inactive.
What are the most common causes of C0037?
The most common causes of C0037 are: Damaged or corroded wiring near the sensor, Failed left-rear wheel speed sensor, Corroded or loose sensor connector, Damaged tone/reluctor ring or excessive air gap, Debris, rust, or metal shavings at the sensor tip, Open or short in the sensor circuit, ABS module fault or loss of communication. The specific cause varies by vehicle.
How much does it cost to fix C0037?
Repair costs for C0037 range from $120 to $2,000, depending on the vehicle and root cause.
Which vehicles are affected by C0037?
Au7o has documented C0037 across 3 vehicle models from 2 manufacturers: Ford, Volkswagen.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.