C0037 on Ford: How to Diagnose & Fix
Left Rear Wheel Speed Sensor Circuit
1 Ford model · 1 documented issue · 1 critical · $120-$650 repair
C0037 on Ford by model: symptoms, diagnosis and fix
Transit Connect owners report intermittent ABS and traction control warnings caused by wheel speed sensor signal dropouts, often due to sensor contamination, corrosion at connectors, or damaged wiring near the hubs. The issue can be intermittent and may also disable stability control functions until repaired. This pattern appears in NHTSA complaints and owner reports describing ABS/AdvanceTrac warnings and sensor replacement.
Common Symptoms
- ABS warning light illuminated
- Traction control/AdvanceTrac warning
- ABS activates unexpectedly at low speed (sometimes)
- Speedometer fluctuation (rare)
- Stored wheel speed sensor DTCs
How to Fix
Scan ABS module for wheel speed sensor DTCs and view live wheel speed data to identify the affected corner. Clean/inspect tone rings (if applicable), repair wiring/connectors, or replace the wheel speed sensor; clear codes and verify on a road test.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- ABS Wheel Speed SensorCross-refSS20881
Fitment confirmed against the ShowMeTheParts catalog for this vehicle's year and engine.
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Sources for this issue (1)
C0037 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does C0037 mean on a Ford?
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. On Ford it is documented across 1 model: Transit Connect.
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 on a Ford?
Published repair estimates on Ford range from $120 to $650 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.