C0038

Q: What does OBD2 code C0038 mean?

C0038 means: Left Rear Wheel Speed Sensor Circuit Range/Performance. The left rear wheel speed sensor signal is outside the expected range compared to other wheels.

Left Rear Wheel Speed Sensor Circuit Range/Performance

The left rear wheel speed sensor signal is outside the expected range compared to other wheels.

SeverityModerate

CategoryABS / Brakes

Est. Repair Cost$120-$300

Code TypeChassis

DIY RepairYes

⚡ Common Causes

›Damaged or dirty tone ring
›Sensor air gap too large
›Wiring damage
›Worn wheel bearing

⚠️ Symptoms

›ABS warning light on
›Traction control may be disabled

✅ How to Fix — Step by Step

Step 1:Inspect tone ring
Step 2:Check sensor air gap and wiring
Step 3:Replace sensor if faulty

🔧 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 C0038 before replacing parts unnecessarily. Always confirm the fault using live data and manufacturer-recommended diagnostic procedures.

💡 Pro Tip: Rear sensors are more exposed to road debris - check for physical damage first.

Repair Cost Estimate

Full Repair Estimate

$120-$300

DIY Possible?

YES

Severity

Moderate

Frequently Asked Questions

What does OBD2 code C0038 mean?+

C0038 stands for Left Rear Wheel Speed Sensor Circuit Range/Performance. The left rear wheel speed sensor signal is outside the expected range compared to other wheels.

What causes code C0038?+

Damaged or dirty tone ring; Sensor air gap too large; Wiring damage; Worn wheel bearing

How do I fix code C0038?+

Inspect tone ring; Check sensor air gap and wiring; Replace sensor if faulty

How much does it cost to fix C0038?+

Estimated repair cost for C0038 is $120-$300.

Is C0038 DIY-friendly?+

Yes — C0038 is generally DIY-friendly with basic tools.