Question about 2003 Chevrolet Silverado 1500

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Coolant temp. below thermostat regulating temp

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That just is a fancy way of saying the thermostat is bad, probably stuck,,,replace the thermostat and disconnect the battery and the code will go away and stay away

Posted on Oct 08, 2009

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

Posted on Oct 08, 2009

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Posted on Jan 02, 2017

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SOURCE: I have a 2003 Chevy Trailblazer that failed my

First, you should check to see if there is a thermostat in the engine or if it is stuck open.

Posted on Apr 28, 2010

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SOURCE: Engine light came on with a code reading P0128

Most likelty the thermostat is stuck open, so replace it.

Posted on Dec 02, 2010

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1 Answer

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

2005 Mercury Monterey with check engine code P0128; what does it mean?


P0128 is Coolant Thermostat ( Coolant Temp Below Thermostat Regulating Temperature ). The thermostat may be stuck open, preventing normal operating Temperature from beeing reached.How is the heat inside the car is it below normal ? Or the engine Coolant Temperature Sensor may be faulty and needs to be replaced. Good Luck and have a good XMASS.

Dec 17, 2010 | 2005 Mercury Monterey

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 heating problem on my nissan sentra 98 model 160 gsi , auto , it only heats if i drive for about an hour , and if i drive over 100 km per hour


check your thermostat this regulates the coolant temp at factory preset temp.engine will warm up quickly.the thermostat opens up to allow coolant to circulate at preset temp. ang closes below specified temp.

Jan 20, 2010 | 2000 Nissan Sentra

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

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

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