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Home >> Infiniti >> 2014 >> Q50 Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS U0101 To P015D (Except Hybrid) >> DTC P0128: Thermostat Function >> DTC Description >> DTC Detection Logic
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DTC Detection Logic

Engine coolant temperature has not risen enough to open the thermostat even though the engine has run long enough.

This is due to a leak in the seal or the thermostat being stuck open.

DTC DETECTION CONDITION

DTC No. CONSULT screen terms (Trouble diagnosis content) DTC detecting condition
P0128 THERMSTAT FNCTN [Coolant thermostat (coolant temperature below thermostat regulating temperature)] The engine coolant temperature does not reach to specified temperature even though the engine has run long enough.
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