OBD2 Car ScannerWhat does U0456 mean?
U0456 stands for Invalid Data Received From Coolant Temperature Control Module. Two or more of the car's computer modules are not communicating properly over the vehicle network (CAN bus).
Network codes cover the communication between the car's computer modules. When the car's computer sees a reading outside its normal range, it stores this code and may turn on a warning light on the dashboard.
Common causes
- Low or weak battery
- Damaged network wiring or connector
- A module that has lost power or failed
- Aftermarket accessories interfering with the network
What to do
- Read all stored and pending codes with a scanner. Several codes together often point to one cause.
- Note the freeze frame data (speed, temperature, load) recorded when the code was set.
- Inspect the wiring and connectors of the part named in the code for damage, corrosion or looseness.
- Fix the most likely and cheapest cause first, then clear the code and drive to see if it comes back.
Read this code from your own car
Plug in a cheap ELM327 adapter and the app shows every fault code, what it means and how to fix it.
Frequently asked questions
What does U0456 mean?
U0456 means “Invalid Data Received From Coolant Temperature Control Module”. It belongs to the network communication group: Two or more of the car's computer modules are not communicating properly over the vehicle network (CAN bus).
Is it safe to drive with U0456?
You can usually drive carefully for a short time, but fix it soon to avoid further damage or higher fuel use.
How do I clear U0456?
Fix the cause, then clear the code with an OBD2 scanner or app. If the fault is still there, the code will come back.
Related codes
- U0452Invalid Data Received From Restraints Control Module
- U0453Invalid Data Received From Side Restraints Control Module Left
- U0454Invalid Data Received From Side Restraints Control Module Right
- U0455Invalid Data Received From Restraints Occupant Classification System Module
- U0457Invalid Data Received From Information Center A
- U0458Invalid Data Received From Information Center B
- U0459Invalid Data Received From Head Up Display
- U045AInvalid Data Received From Parking Assist Control Module A
Code meanings can vary by manufacturer. This page is general guidance, not a repair manual. Always confirm the cause before replacing parts.