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DTC P0128 - Coolant Thermostat (Coolant Temp Below Thermostat Regulating Temperature)

WARNING: This page does not describe the selected car, but rather 24 other vehicles, including the 2019 Lincoln Navigator, 2019 Lincoln Nautilus, 2019 Lincoln MKZ, 2019 Lincoln MKT, and 2019 Lincoln MKC. However, it is still accessible from the selected car via links, so may be relevant.
DTC DESCRIPTION P0128 - COOLANT THERMOSTAT (COOLANT TEMP BELOW THERMOSTAT REGULATING TEMPERATURE)

Description:  This DTC sets when the thermostat monitor has not achieved the required engine operating temperature within a specified amount of time.
Possible Causes: 
  • Insufficient warm up time
  • Low engine coolant level
  • Leaking or stuck open thermostat
  • Damaged engine coolant temperature (ECT) sensor
  • Damaged cylinder head temperature (CHT) sensor
Diagnostic Aids:  Refer to THERMOSTAT MONITOR for system information.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
Continental 2.0L,
Continental 2.7L,
Continental 3.0L,
EcoSport 1.0L,
EcoSport 1.5L,
EcoSport 2.0L,
Edge,
Escape/Kuga 1.5L,
Escape/Kuga 2.0L,
Explorer 2.3L,
Fiesta,
Fusion 1.5L,
Fusion 2.0L,
Fusion 2.7L,
KA,
MKC,
MKT 2.0L,
MKZ,
Mustang 2.3L,
Nautilus,
Ranger,
Taurus 2.0L,
Transit Connect		 GO to PINPOINT TEST DX .
All others GO to PINPOINT TEST DL .
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