For Shop Owners

P0128 - Coolant Thermostat Malfunction

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3 What does this mean?

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
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.
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 Description

Indicates that the thermostat monitor has not achieved the required engine operating temperature within a specified amount of time after starting the engine.
OBDII Code P0128 - Coolant Thermostat Malfunction -

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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P0128 Comments

Help us improve Leave a comment below or tell us if the information above help you fix the code. What are the symptoms on your vehicle for the P0128 code? Have you replaced any parts?
Any information is appreciated. Thanks
Repair Importance Level: 3
1=Low 2=Medium 3=High
Repair Difficulty Level: 2
1=Easy 2=Moderate 3=Hard

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