C0037

Q: What does OBD2 code C0037 mean?

C0037 means: Left Rear Wheel Speed Sensor Circuit. The ABS/EBCM has detected an abnormal or missing signal from the left rear wheel speed sensor (WSS), which is used to calculate wheel speed for ABS and traction/stability control.

Left Rear Wheel Speed Sensor Circuit

The ABS/EBCM has detected an abnormal or missing signal from the left rear wheel speed sensor (WSS), which is used to calculate wheel speed for ABS and traction/stability control.

SeverityCritical

CategoryABS / Brakes

Est. Repair Cost$100–$400

Code TypeChassis

DIY RepairYes

⚡ Common Causes

›Failed left rear WSS
›Wiring damage
›Bearing tone ring damaged

⚠️ Symptoms

›ABS light
›Traction control off

✅ How to Fix — Step by Step

Step 1:Check sensor and harness
Step 2:Inspect tone ring
Step 3:Replace sensor

🔧 Diagnostic Tools Required

✔OBD-II Diagnostic Scanner
✔ABS Scanner
✔Digital Multimeter
✔Wheel Speed Sensor Tester
✔Basic Hand Tools

Using the correct diagnostic tools helps identify the root cause of C0037 before replacing parts unnecessarily. Always confirm the fault using live data and manufacturer-recommended diagnostic procedures.

💡 Pro Tip: Inspect the tone ring on the wheel hub for missing teeth or debris before replacing the sensor — a damaged tone ring is a frequent cause of an intermittent WSS signal loss.

Repair Cost Estimate

Full Repair Estimate

$100–$400

DIY Possible?

YES

Severity

Critical

Frequently Asked Questions

What does OBD2 code C0037 mean?+

C0037 stands for Left Rear Wheel Speed Sensor Circuit. The ABS/EBCM has detected an abnormal or missing signal from the left rear wheel speed sensor (WSS), which is used to calculate wheel speed for ABS and traction/stability control.

What causes code C0037?+

Failed left rear WSS; Wiring damage; Bearing tone ring damaged

How do I fix code C0037?+

Check sensor and harness; Inspect tone ring; Replace sensor

How much does it cost to fix C0037?+

Estimated repair cost for C0037 is $100–$400.

Is C0037 DIY-friendly?+

Yes — C0037 is generally DIY-friendly with basic tools.