What Does U0456 Mean?
The receiving module is detecting corrupted or invalid data from the coolant temperature control module. This affects engine cooling system management and temperature-related operations.
Common Causes
30%
Faulty coolant temperature control module with internal circuit failure
25%
Damaged CAN bus wiring or poor connections to coolant control module
25%
Failed coolant temperature sensor providing out-of-range data to control module
15%
Low voltage or unstable power supply affecting module operation
5%
Electromagnetic interference from aftermarket accessories
Diagnostic Steps
1
Step 1: Monitor coolant temperature control module data stream and compare reported values against actual engine temperature using infrared thermometer
2
Step 2: Check coolant temperature sensor resistance at various temperatures and compare to manufacturer specifications; typical cold reading around 2500 ohms at 70°F
3
Step 3: Inspect coolant control module connector for corrosion or damage; test voltage supply and ground circuits (should have stable 12V and ground below 0.1V)
4
Step 4: Check CAN bus circuits at coolant control module; measure resistance between CAN High and CAN Low (should be approximately 60 ohms with key off)
5
Step 5: If all sensors and circuits test good, replace coolant temperature control module and perform relearn procedure if required
Estimated Repair Cost
$200 - $900
Parts + labor, varies by vehicle and location
The receiving module is detecting corrupted or invalid data from the coolant temperature control module. This affects engine cooling system management and temperature-related operations.
The most common cause of U0456 (Invalid Data Received From Coolant Temperature Control Module) is: Faulty coolant temperature control module with internal circuit failure
Typical repair costs for U0456 range from $200 to $900, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Moderate concern. Engine may not reach optimal operating temperature or could overheat if cooling system doesn't respond properly. May cause poor fuel economy, emissions issues, and potential engine damage if ignored.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0456 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Network
System
Engine Cooling System / Engine Management
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
