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Home >> Ford >> 2002 >> Cutaway 7.3 F >> Repair and Diagnosis >> External Pages >> Different car >> Section 2376 (Engine Controls - Diagnostic Subroutines - 6.4L 99R Diesel -- F250-F550 Super Duty) >> Diagnostic Trouble Code (DTC) Charts and Descriptions >> P0128 - Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

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

WARNING: This page is about a different car, the 2008 Ford Pickup, 2008 Ford F550 Super Duty, 2008 Ford F450 Super Duty, and 2008 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
P0128 - COOLANT THERMOSTAT (COOLANT TEMPERATURE BELOW THERMOSTAT REGULATING TEMPERATURE)

Description:  Indicates that 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
  • Inoperative engine coolant temperature (ECT) sensor
Diagnostic Aids:  Refer toPOWERTRAIN CONTROL SOFTWARE for system information.
Application    Key On Engine Off  Key On Engine Running  Continuous Memory 
All   refer to PINPOINT TEST K .
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