U0116: Lost Communication With Coolant Temperature Control Module
MediumNetwork/CommunicationCommunication Bus
What does U0116 mean?
U0116 is a diagnostic trouble code indicating "Lost Communication With Coolant Temperature Control Module". The vehicle's main computer has lost its ability to communicate with a specific module over the data bus. This could be caused by a wiring fault, a blown fuse, or a failed control module.
Symptoms you may notice
- Check engine light (MIL) illuminated on dashboard
- Engine overheating
- Temperature gauge reading high
- Heater not working properly
Estimated repair cost
Typical range in Australia (parts + labour)
$100 – $600 AUD
Common causes
- Failed control module
- CAN bus wiring fault or short
- Blown fuse to the affected module
- Water intrusion in a connector or module
- Battery voltage too low
What should you do?
This code sits in an engine peripheral, typically emissions or forced induction. It will not take braking or steering away, but it can put the car into limp mode, cost you fuel and fail a roadworthy. Book it in rather than clearing it and hoping.
Get a diagnosis for YOUR car
Code U0116 can mean different things depending on your vehicle. TorqueBot gives you a diagnosis specific to your make, model, and year.