C0046ABS / Traction

Left Rear Wheel Speed Sensor Circuit Range/Performance

C0046 means the left rear wheel speed sensor signal is present but out of the expected range or erratic. The ABS module sees a reading that does not agree with the other wheels, so it disables ABS and related systems.

🚗 Yes, but ABS, traction control, and stability control may be disabled until fixed.

MEDIUM

severity

🎯 Top Causes, Ranked by Likelihood

#1Failing wheel speed sensor$60-$250

40%

The sensor produces a weak or intermittent signal.

#2Damaged tone/reluctor ring$100-$400

25%

Missing or damaged teeth on the ring cause erratic readings.

#3Wiring or connector fault$50-$300

20%

Chafed wiring or corroded pins interrupt the signal.

#4Excessive sensor air gap$0-$150

15%

A loose or improperly seated sensor reads inconsistently.

🩺 Common Symptoms

ABS warning light on
Traction/stability control light on
Erratic or dropping speedometer
ABS activating at odd times

💰 Repair Cost: DIY vs Shop

DIY Cost

$60-$300

Shop Cost

$150-$450

📋 Free OBD2 Code Cheat Sheet

The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.

🔧 How to Diagnose C0046

1Confirm the code and clear it for a road test

2Inspect the tone ring and sensor tip for damage or debris

3Watch live wheel speed data for the left rear dropping out

4Check wiring and connector integrity to the sensor

❓ Frequently Asked Questions

Can I drive with C0046?

Yes, but ABS and traction control may be off, so drive carefully in bad weather and fix it soon.

What is the difference between C0045 and C0046?

C0045 is a circuit fault (open or short), while C0046 is a range or performance problem where the signal exists but is out of range.

What causes C0046 most often?

A failing wheel speed sensor or a damaged tone ring producing erratic readings at the left rear wheel.

🔗 Related Codes

C0045C0041C0036C0051