C066A — Right Rear Wheel Speed Sensor B Intermittent/Erratic

What Does C066A Mean?

C066A is a diagnostic trouble code indicating: Right Rear Wheel Speed Sensor B 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 C066A

⚠️ Check Engine Light (MIL) illuminated
⚠️ Right Rear Wheel Speed Sensor B 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 Right Rear Wheel Speed Sensor B
🔍 Wire chafing causing intermittent contact
🔍 Right Rear Wheel Speed Sensor B failing under heat or vibration
🔍 Corroded connector pins with partial contact

Frequently Asked Questions

What does C066A mean?

C066A indicates: Right Rear Wheel Speed Sensor B Intermittent/Erratic. The vehicle's computer has detected that the Right Rear Wheel Speed Sensor B is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code C066A?

Only short distances if absolutely necessary. C066A affects a critical system and should be diagnosed within a few days to avoid further damage.

How much does it cost to fix C066A?

Repair costs for C066A 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 Right Rear Wheel Speed Sensor B connectors
🔧 Repair chafed or damaged wiring in Right Rear Wheel Speed Sensor B circuit
🔧 Replace Right Rear Wheel Speed Sensor B 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.

C066A: Right Rear Wheel Speed Sensor B Intermittent/Erratic