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Engine-Codes.com | All About OBDII Engine Codes

P0128 Ford

P0128 Ford - Coolant Thermostat

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P0128 Ford Comments |  Add Comment
Possible causes
- 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
Help with Possible causes What does this mean?
Tech notes
If cooling system is not leaking and the fluid level is OK, replacing the thermostat usually takes care of the problem.
Help with Tech Notes What does this mean?
When is the code detected?
The engine coolant temperature does not reach to specified temperature even though the engine has run long enough.
Possible symptoms
- 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.

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
2008 FORD F-750 SD Engine And Engine Cooling:engine:diesel Details
2008 FORD FOCUS Power Train:automatic Transmission:control Module (tcm, Pcm) Details
2008 FORD FOCUS 103100 Power Train:automatic Transmission:control Module (tcm, Pcm) Details
2008 FORD F-250 SD 061200 Engine And Engine Cooling:engine:diesel Details
2008 FORD F-350 SD 061200 Engine And Engine Cooling:engine:diesel Details
More Bulletins Help with Technical Service Bulletins What does this mean?
P0128 Ford Information for specific Ford models
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