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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,
Edge 2.0L,
Edge 2.7L,
Escape/Kuga 1.5L,
Escape/Kuga 2.0L,
Explorer 2.3L, F-150 2.7L,
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,
Taurus 2.0L		 GO to Pinpoint Test DX .
All others GO to Pinpoint Test DL .
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