U0456 code meaning
Invalid Data Received From Coolant Temperature Control Module
Network system Generic code U04xx codes Check engine light
What U0456 means
U0456 means a module receives messages from the coolant temperature control module but rejects them as invalid; U0116 is the lost-contact twin. Such a controller runs electronically managed cooling, for example an electric coolant pump whose built-in electronics, as Bosch describes for its PAD2 pump, take speed commands over PWM or LIN and report back. Kia documents the code: Pitstop PS647 for the 2017-2020 Niro hybrid and plug-in hybrid links U045600 to the engine's electric water pump, whose plug and pigtail behind the coolant temperature sensor can be soaked with coolant; fuses for module 8 and the pump may blow, and the pump is replaced with its short harness. CARB requires communication errors of digitally controlled components to be detected. A temperature warning and reduced power are possible.
U0456 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0456
- Engine or coolant temperature warning
- Reduced engine power as protection
- Check engine lamp on some models
Common causes of U0456
- Most likelyCoolant in the plug or pigtail of the electric water pump
- PossibleBlown fuse or weak supply of the pump or cooling control module
- PossibleFaulty electronics of the electric coolant pump or cooling module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Coolant temperature module
What each part of U0456 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 56 | The exact fault in that area. |
What to do next
- Note U0456 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U0456
What does U0456 mean?
U0456 means "Invalid Data Received From Coolant Temperature Control Module". U0456 means a module receives messages from the coolant temperature control module but rejects them as invalid; U0116 is the lost-contact twin. It is a generic code, so it means the same on every make.
Is it safe to drive with U0456?
Drive gently and only to a workshop. With U0456 the car can go into limp mode (reduced power) to protect itself.
Will U0456 fail an emissions test?
Yes, it can. U0456 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is U0456 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. This is a job for a workshop.
Will U0456 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.