C0504 — Left Front Wheel Speed Sensor A Intermittent/Erratic

What Does C0504 Mean?

C0504 is a diagnostic trouble code indicating: Left Front Wheel Speed Sensor A Intermittent/Erratic. This code relates to the chassis system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of C0504

⚠️ Check Engine Light (MIL) illuminated
⚠️ Left Front Wheel Speed Sensor A signal cutting in and out
⚠️ Related system working sometimes but not consistently
⚠️ ABS or stability control warning light

Common Causes

🔍 Loose or intermittent connection at Left Front Wheel Speed Sensor A
🔍 Wire chafing causing intermittent contact
🔍 Left Front Wheel Speed Sensor A failing under heat or vibration
🔍 Corroded connector pins with partial contact

Frequently Asked Questions

What does C0504 mean?

C0504 indicates: Left Front Wheel Speed Sensor A Intermittent/Erratic. The vehicle's computer has detected that the Left Front Wheel Speed Sensor A is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code C0504?

Only short distances if absolutely necessary. C0504 affects a critical system and should be diagnosed within a few days to avoid further damage.

How much does it cost to fix C0504?

Repair costs for C0504 typically range from $30 to $400, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

🔧 Inspect and reseat all Left Front Wheel Speed Sensor A connectors
🔧 Repair chafed or damaged wiring in Left Front Wheel Speed Sensor A circuit
🔧 Replace Left Front Wheel Speed Sensor A if failing intermittently

1
Find your vehicle above
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2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

C0504: Left Front Wheel Speed Sensor A Intermittent/Erratic