U0116 — Lost Communication With Coolant Temperature Control Module

What Does U0116 Mean?

U0116 is a diagnostic trouble code indicating: Lost Communication With Coolant Temperature Control Module. This code relates to the network communication system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of U0116

⚠️ Check Engine Light (MIL) illuminated
⚠️ No communication with Coolant Temperature Control Module
⚠️ Multiple warning lights may illuminate simultaneously
⚠️ Related system completely inoperative
⚠️ Multiple warning lights on dashboard

Common Causes

🔍 CAN bus wiring fault (open or shorted) to Coolant Temperature Control Module
🔍 Power or ground supply issue to Coolant Temperature Control Module
🔍 Coolant Temperature Control Module internal failure
🔍 Water intrusion damaging module or connectors
🔍 CAN bus termination resistor fault

Frequently Asked Questions

What does U0116 mean?

U0116 indicates: Lost Communication With Coolant Temperature Control Module. The vehicle's computer has detected that the Coolant Temperature Control Module is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code U0116?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with U0116 for extended periods may cause additional problems.

How much does it cost to fix U0116?

Repair costs for U0116 typically range from $80 to $1200, 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 Coolant Temperature Control Module for damage
🔧 Check power and ground supply to Coolant Temperature Control Module
🔧 Replace failed Coolant Temperature Control Module

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
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.

U0116: Lost Communication With Coolant Temperature Control Module