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P0128 - Coolant Thermostat Malfunction

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
Tech notes
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.
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P0128 Description

Indicates that the thermostat monitor has not achieved the required engine operating temperature within a specified amount of time after starting the engine.

P0128 Information for specific makes
P0128 ACURA Coolant System Malfunction
P0128 AUDI Coolant Temperature Below Operating Range
P0128 BMW Thermostat Low Coolant Temperature
P0128 BUICK Engine Coolant Temperature Below Thermostat Regulating Temperature
P0128 CADILLAC Engine Coolant Temperature Below Thermostat Regulating Temperature
P0128 CHEVROLET Engine Coolant Temperature Below Thermostat Regulating Temperature
P0128 CHRYSLER Thermostat Rationality
P0128 DODGE Thermostat Rationality
P0128 FORD Coolant Thermostat
P0128 GMC Engine Coolant Temperature Below Thermostat Regulating Temperature
P0128 HONDA Coolant System Malfunction
P0128 HYUNDAI Coolant Thermostat
P0128 INFINITI Thermostat Function
P0128 ISUZU Engine Coolant Temperature Below Thermostat Regulating Temperature
P0128 JAGUAR Coolant Thermostat Malfunction
P0128 JEEP Thermostat Rationality
P0128 KIA Coolant Thermostat Malfunction
P0128 LEXUS Coolant Thermostat
P0128 MAZDA Coolant Thermostat Malfunction
P0128 MINI Thermostat Low Coolant Temperature
P0128 MITSUBISHI Coolant Thermostat Malfunction
P0128 NISSAN Thermostat Function
P0128 PONTIAC Engine Coolant Temperature Below Thermostat Regulating Temperature
P0128 SATURN Engine Coolant Temperature Below Thermostat Regulating Temperature
P0128 SCION Coolant Thermostat
P0128 SUBARU Coolant Thermostat Malfunction
P0128 TOYOTA Coolant Thermostat
P0128 VOLKSWAGEN Coolant Temperature Below Operating Range
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