P0128 Ford - Coolant Thermostat
Repair Importance Level:
Repair Difficulty Level:
- Leaking or stuck open thermostat
- Low engine coolant level
- Insufficient warm up time
- Faulty engine coolant temperature sensor
- Engine coolant temperature sensor harness is open or shorted
- Engine coolant temperature sensor circuit poor electrical connection
If cooling system is not leaking and the fluid level is OK, replacing the thermostat usually takes care of the problem.
When is the code detected?
The engine coolant temperature does not reach to specified temperature even though the engine has run long enough.
- Engine Light ON (or Service Engine Soon Warning Light)
P0128 Ford Description
Coolant thermostat (coolant temperature below thermostat regulating temperature). Indicates that the thermostat monitor has not achieved the required engine operating temperature within a specified amount of time after starting the engine.
P0128 Ford Information for specific Ford models
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FORD Technical Service Bulletins for P0128 code
2008 FORD F-250 SD Engine And Engine Cooling:engine:diesel Details
2008 FORD F-350 SD Engine And Engine Cooling:engine:diesel Details
2008 FORD F-450 SD Engine And Engine Cooling:engine:diesel Details
2008 FORD F-550 SD Engine And Engine Cooling:engine:diesel Details
2008 FORD F-650 SD Engine And Engine Cooling:engine:diesel Details
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