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U0456 Invalid Data Received From Coolant Temperature Control Module

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Coolant in the plug or pigtail of the electric water pump
Blown fuse or weak supply of the pump or cooling control module
Faulty electronics of the electric coolant pump or cooling module

Symptoms

  • Engine or coolant temperature warning
  • Reduced engine power as protection
  • Check engine lamp on some models

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–700
Time0.5–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

coolant temperature module

Related codes

U0116P25AF

References: static.nhtsa.gov, bosch-mobility.com, law.cornell.edu.