U0668: Lost Communication With Engine Oil Level Sensor Circuit
Severity
Medium
System
Vehicle Systems
What Does U0668 Mean?
U0668 is a diagnostic trouble code indicating: Lost Communication With Engine Oil Level Sensor Circuit. This code relates to the vehicle systems system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.
Symptoms of U0668
- ⚠️ Check Engine Light (MIL) illuminated
- ⚠️ No communication with Engine Oil Level Sensor Circuit
- ⚠️ Multiple warning lights may illuminate simultaneously
- ⚠️ Related system completely inoperative
- ⚠️ System warning light illuminated
Common Causes
- 🔍 CAN bus wiring fault (open or shorted) to Engine Oil Level Sensor Circuit
- 🔍 Power or ground supply issue to Engine Oil Level Sensor Circuit
- 🔍 Engine Oil Level Sensor Circuit internal failure
- 🔍 Water intrusion damaging module or connectors
- 🔍 CAN bus termination resistor fault
Frequently Asked Questions
What does U0668 mean?
U0668 indicates: Lost Communication With Engine Oil Level Sensor Circuit. The vehicle's computer has detected that the Engine Oil Level Sensor Circuit is not operating within its expected parameters and stored this diagnostic trouble code.
Can I drive with code U0668?
You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with U0668 for extended periods may cause additional problems.
How much does it cost to fix U0668?
Repair costs for U0668 typically range from $80 to $800, 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 CAN bus wiring to Engine Oil Level Sensor Circuit for damage
- 🔧 Check power and ground supply to Engine Oil Level Sensor Circuit
- 🔧 Replace failed Engine Oil Level Sensor Circuit
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1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
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2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
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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.
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U0609
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