DTC P0128: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, 2011 Ford Fusion, 2010 Mercury Milan, and 2010 Ford Fusion. 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 the thermostat monitor has not achieved the required engine operating temperature within a specified amount of time after starting the engine. | ||
| Possible Causes: |
|
||
| Diagnostic Aids: | Refer to ENHANCED THERMOSTAT MONITOR for system information. | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | GO to PINPOINT TEST DL . | ||