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Coolant Temp Below Thermostat REgulating Temp

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It may be stuck open. Usually there is a trouble code for that. Just replace the thermostat.

Posted on Dec 11, 2009

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Codepo128onbuicklasa re2002


code p 0128 refers to coolant thermostat --coolant temp below thermostat regulating temperature ===causes--- mechanical fault
remove and test the thermostat --replace if necessary
It may be stuck open and not regulating coolant flow there by not allowing the engine to come to operating temperature

Dec 09, 2015 | Cars & Trucks

4 Answers

Po128 is the code. What's the problem


Well, I can't give you any specific information regarding your vehicle because you forgot to mention what kind of vehicle you have. (This is kinda important if you really want some help figuring out what is wrong with your car)

The "Generic OBD" of code P0128 is "Coolant Temperature Below Thermostat Regulating Temperature"

The most likely cause is a stuck-open thermostat, however, I have also seen defective Engine Coolant Temperature (ECT) sensors also cause this code.

Jun 13, 2011 | Chevrolet TrailBlazer Cars & Trucks

1 Answer

I change the coolant temp switch, now its the below thermostat regulating temp. where is the location ?


For the I6 engine.....Has 1 sensor (though other cars have 2). We only have 1 coolant temperature sensor, it's located 2" above the thermostat.

Mar 05, 2011 | 2004 Buick Rainier

1 Answer

Code PO128 came up on my 2005 Explorer. Any ideas on how to correct the problem?


P0128 - Coolant Thermostat (coolant Temp Below Thermostat Regulating Temperature). First check the coolant level,if its low then refill the coolant.If the coolant is checked full then get the thermostat replaced.-----------That's it.

Nov 18, 2010 | Ford Explorer Cars & Trucks

1 Answer

I have a 2000 hyundai accent and it has a fault code of P0128 what does that mean


P0128=Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature),
time to replace thermostat,coolant not at correct temp

Dec 09, 2009 | 2000 Hyundai Accent

1 Answer

Check engine light is on. error reads PO128 and


hi 128 is coolant temp below regulating temp 405 is










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Nov 20, 2009 | 2002 Saturn L-Series

1 Answer

Coolant temp below thermostat regulating temp


more than likely the thermostat has stuck open. Or opening to soon not allowing the car to reach normal operating temperature. I would start by replacing the thermostat. Clearing the code and running a drive cycle and see if the code comes back. if the code does not return problem solved. if it does return replace the coolant temp sensor.

Oct 17, 2009 | 2005 Pontiac Grand Prix

2 Answers

Check engine light on, diagnostic code 0128 and 0410 keep coming up


P0128 - Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

P0410 - Secondary Air Injection System Malfunction
(has to do with exhaust system)

Note: There is a technical service bulletin (TSB) regarding code P0410 for a number of GM models. The TSB calls for the replacement of the AIR pump and the installation of a new secondary injection hose.

Oct 13, 2009 | 2005 Chevrolet TrailBlazer

2 Answers

Coolant temp. below thermostat regulating temp


bad thermostat...it is stuck in an open loop.

Oct 08, 2009 | 2003 Chevrolet Silverado 1500

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