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

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 2.0L,
Edge 2.7L,
Escape/Kuga 1.5L,
Escape/Kuga 2.0L,
Explorer 2.3L,
Fiesta,
Focus,
Fusion 1.5L,
Fusion 2.0L,
Fusion 2.7L,
KA,
MKC,
MKT 2.0L,
MKX 2.0L,
MKX 2.7L,
MKZ,
Mustang 2.3L,
Ranger,
Taurus 2.0L		 GO to PINPOINT TEST DX .
All others GO to PINPOINT TEST DL .
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