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

WARNING: This page does not describe the selected car, but rather 31 other vehicles, including the 2015 Lincoln Navigator, 2015 Lincoln MKZ, 2015 Lincoln MKX, 2015 Lincoln MKT, and 2015 Lincoln MKS. However, it is still accessible from the selected car via links, so may be relevant.
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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