Lost Communication With Coolant Temperature Control Module

Where it lives

For U0116, the part to look at first is the module named here.

Check these first

• A wiring or connector fault between the Coolant Temperature Control Module and the network
• A failed Coolant Temperature Control Module
• A power or ground loss at the module
• A software fault that drops the module offline

What to do next

1. Scan all modules for communication codes
2. Inspect the wiring and connector at the Coolant Temperature Control Module
3. Check the module power and ground feeds
4. Reflash the module if the bus and feeds test good
5. Replace the Coolant Temperature Control Module if the fault returns
6. Clear the code and retest

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