U0659: Lost Communication With Left Front Temperature Actuator
Severity
Medium
System
Vehicle Systems
What Does U0659 Mean?
U0659 is a diagnostic trouble code indicating: Lost Communication With Left Front Temperature Actuator. 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 U0659
- ⚠️ Check Engine Light (MIL) illuminated
- ⚠️ No communication with Left Front Temperature Actuator
- ⚠️ Multiple warning lights may illuminate simultaneously
- ⚠️ Related system completely inoperative
- ⚠️ System warning light illuminated
Common Causes
- 🔍 CAN bus wiring fault (open or shorted) to Left Front Temperature Actuator
- 🔍 Power or ground supply issue to Left Front Temperature Actuator
- 🔍 Left Front Temperature Actuator internal failure
- 🔍 Water intrusion damaging module or connectors
- 🔍 CAN bus termination resistor fault
Frequently Asked Questions
What does U0659 mean?
U0659 indicates: Lost Communication With Left Front Temperature Actuator. The vehicle's computer has detected that the Left Front Temperature Actuator is not operating within its expected parameters and stored this diagnostic trouble code.
Can I drive with code U0659?
You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with U0659 for extended periods may cause additional problems.
How much does it cost to fix U0659?
Repair costs for U0659 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 Left Front Temperature Actuator for damage
- 🔧 Check power and ground supply to Left Front Temperature Actuator
- 🔧 Replace failed Left Front Temperature Actuator
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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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