For Shop Owners

P0128 - Coolant Thermostat Malfunction

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3   
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
  • 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.
    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
  • Need more help?

    Do you need more help with the P0128 code? Ask a question to our users or find an automotive repair shop near you to help fix the OBDII code
  • Ask a Question
  • Find a Shop
  • Related Information

    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
    Top ⇧
    Repair Importance Level: 3
    1=Low 2=Medium 3=High  
    Repair Difficulty Level: 2
    1=Easy 2=Moderate 3=Hard  

    Browse All Codes For Specific Model Year

    Ford F150 1998 Ford F150
    1999 Ford F150
    2000 Ford F150
    2001 Ford F150
    2002 Ford F150
    2003 Ford F150
    Ford Fusion 2006 Ford Fusion
    2007 Ford Fusion
    2008 Ford Fusion
    2009 Ford Fusion
    2010 Ford Fusion
    2011 Ford Fusion
    2012 Ford Fusion
    Honda Accord 2008 Honda Accord
    2009 Honda Accord
    2010 Honda Accord
    Honda Civic 1996 Honda Civic
    1997 Honda Civic
    1998 Honda Civic
    1999 Honda Civic
    2000 Honda Civic
    Infiniti G35 2003 Infiniti G35
    2004 Infiniti G35
    2005 Infiniti G35
    2006 Infiniti G35
    Nissan Altima 2002 Nissan Altima
    2003 Nissan Altima
    2004 Nissan Altima
    2005 Nissan Altima
    2006 Nissan Altima
    2008 Nissan Altima
    2009 Nissan Altima
    2010 Nissan Altima
    2011 Nissan Altima
    2012 Nissan Altima
    Nissan Maxima 2005 Nissan Maxima
    2006 Nissan Maxima
    2007 Nissan Maxima
    2008 Nissan Maxima
    Nissan Pathfinder 2005 Nissan Pathfinder
    2006 Nissan Pathfinder
    2007 Nissan Pathfinder
    2008 Nissan Pathfinder
    2009 Nissan Pathfinder
    2010 Nissan Pathfinder
    2011 Nissan Pathfinder
    2012 Nissan Pathfinder
    Nissan Rogue 2008 Nissan Rogue
    2009 Nissan Rogue
    2010 Nissan Rogue
    2011 Nissan Rogue
    2012 Nissan Rogue
    2013 Nissan Rogue
    Nissan Sentra 2002 Nissan Sentra
    2003 Nissan Sentra
    2004 Nissan Sentra
    2005 Nissan Sentra
    2006 Nissan Sentra
    2007 Nissan Sentra
    2008 Nissan Sentra
    2009 Nissan Sentra
    2010 Nissan Sentra
    2011 Nissan Sentra
    2012 Nissan Sentra
    Toyota Camry 1997 Toyota Camry
    1998 Toyota Camry
    1999 Toyota Camry
    2000 Toyota Camry
    2001 Toyota Camry
    2006 Toyota Camry
    2007 Toyota Camry
    2008 Toyota Camry
    2009 Toyota Camry
    2010 Toyota Camry
    2011 Toyota Camry
    Toyota Corolla 2005 Toyota Corolla
    Toyota Echo 2000 Toyota Echo
    2001 Toyota Echo
    2002 Toyota Echo
    Toyota Highlander 2001 Toyota Highlander
    2002 Toyota Highlander
    2003 Toyota Highlander
    2004 Toyota Highlander
    2005 Toyota Highlander
    2006 Toyota Highlander
    2007 Toyota Highlander
    Toyota Prius 2004 Toyota Prius
    2005 Toyota Prius
    2006 Toyota Prius
    2007 Toyota Prius
    2008 Toyota Prius
    2009 Toyota Prius
    Scion xB 2005 Scion xB
    2006 Scion xB
    2007 Scion xB