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Home >> Ford >> 2015 >> Explorer Limited, 3.5L Eng VIN 8, AWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Powertrain DTC Charts & Descriptions (Except Diesel & Hybrid) >> Diagnostic Trouble Code (DTC) Charts and Descriptions >> P0128 - Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) - DTC Chart

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

P0128 - COOLANT THERMOSTAT (COOLANT TEMPERATURE BELOW THERMOSTAT REGULATING TEMPERATURE) - DTC CHART

Description:  This DTC sets when the thermostat monitor has not achieved the required engine operating temperature within a specified amount of time after starting the engine.
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 
Edge 2.0L,
Edge 2.7L,
Escape/Kuga 2.0L,
Explorer 2.0L,
F-150 2.7L,
Fiesta,
Focus,
Fusion 1.5L,
Fusion 1.6L,
Fusion 2.0L,
MKC,
MKT 2.0L,
MKZ 2.0L,
Mustang 2.3L,
Taurus 2.0L,
Transit Connect 1.6L		 GO to Pinpoint Test DX .
All others GO to Pinpoint Test DL .
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