What Does U0116 Mean?
The control modules cannot communicate with the Coolant Temperature Control Module over the vehicle network. This module actively manages engine coolant temperature through electric pumps, thermostats, or shutters.
Common Causes
35%
Damaged wiring or corroded connectors to coolant control module
30%
Failed Coolant Temperature Control Module
20%
CAN bus network circuit fault
10%
Power supply or ground circuit issue
5%
Module software issue or version mismatch
Diagnostic Steps
1
Step 1: Verify power supply and ground connections at the coolant temperature control module
2
Step 2: Inspect module connectors and wiring for damage, corrosion, or coolant contamination
3
Step 3: Use scan tool to attempt communication with coolant control module and check for response
4
Step 4: Test CAN bus circuits for proper resistance and voltage levels between modules
5
Step 5: Check for software updates or reprogram module; replace if hardware failure is confirmed
Estimated Repair Cost
$200 - $1,200
Parts + labor, varies by vehicle and location
The control modules cannot communicate with the Coolant Temperature Control Module over the vehicle network. This module actively manages engine coolant temperature through electric pumps, thermostats, or shutters.
The most common cause of U0116 (Lost Communication With Coolant Temperature Control Module) is: Damaged wiring or corroded connectors to coolant control module
Typical repair costs for U0116 range from $200 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Active cooling management may not function, potentially causing engine overheating or inefficient warm-up. Monitor temperature gauge closely and avoid extended idling or heavy loads until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0116 to identify the root cause.
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Quick Info
Category
Network
System
Engine Cooling System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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