C0668 — Right Rear Wheel Speed Sensor B Circuit Low

What Does C0668 Mean?

C0668 is a diagnostic trouble code indicating: Right Rear Wheel Speed Sensor B Circuit Low. This code relates to the chassis system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of C0668

⚠️ Check Engine Light (MIL) illuminated
⚠️ Right Rear Wheel Speed Sensor B reading at zero or minimum value
⚠️ Related system not functioning or in fail-safe mode
⚠️ ABS or stability control warning light

Common Causes

🔍 Open or broken wire in Right Rear Wheel Speed Sensor B circuit
🔍 Poor ground connection at Right Rear Wheel Speed Sensor B
🔍 Faulty Right Rear Wheel Speed Sensor B with no output signal
🔍 Disconnected or loose Right Rear Wheel Speed Sensor B connector
🔍 Blown fuse in related circuit

Frequently Asked Questions

What does C0668 mean?

C0668 indicates: Right Rear Wheel Speed Sensor B Circuit Low. 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 C0668?

Only short distances if absolutely necessary. C0668 affects a critical system and should be diagnosed within a few days to avoid further damage.

How much does it cost to fix C0668?

Repair costs for C0668 typically range from $20 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

🔧 Repair broken wire or restore ground in Right Rear Wheel Speed Sensor B circuit
🔧 Clean and secure Right Rear Wheel Speed Sensor B connector and ground points
🔧 Replace failed Right Rear Wheel Speed Sensor B

1
Find your vehicle above
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2
Check for recalls
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3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

C0668: Right Rear Wheel Speed Sensor B Circuit Low