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Engine coolant temp too low code :0128

Engine lite on, checked code

Posted by Anonymous on

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6ya6ya
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Posted on Jan 02, 2017

  • 13 Answers

SOURCE: Check engine light on, diagnostic code 0128 and

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.

Posted on Oct 14, 2009

  • 1114 Answers

SOURCE: 2002 Blazer. Code 0128 Coolant Thermostat. Coolant Temperature

sound like """"sounds'''like thermostat issue! u might think about starting at that point!hope this helps. John

Posted on Dec 22, 2009

  • 416 Answers

SOURCE: get code 0128 colant temp low is the colant

is the temp gauge on dash around 200 if not yoh may have a bad thermostat not letting car get to normal temp

Posted on Jan 30, 2010

  • 320 Answers

SOURCE: The coolant temp will sometimes

if your temp gauge is going blank several things can cause this. one is a bad wiring connection on the sending unit itself. could be corrosion on the connectors. these types of sending units work like a thermistat they do go bad. but id be looking for a loose ground. since this circuit is grounded to the body you could ground the system by using a set of jumper cables. use one side to ground the battery to the body and the other side to ground the motor to the body and see if it still happens.
a large amount of electrical issues are created by faulty grounds. i usually start by disconnecting the harness from the sending unit and inspecting it,if its not damaged. i would then reground the systems

Posted on Aug 31, 2010

  • 3 Answers

SOURCE: I HAVE A 2007 CHEVY COBALT THE CHECK ENGINE LIGHT

I had this problem with a 2007 Chevy Cobalt. I changed the coolant sensor and even though the check engine light went out I still had a reading of "---" on the coolant gauge. The problem is most likely one of three things: a low coolant level, a bad coolant sensor, or the thermostat needs to be replaced. The only other possible thing it could be is a bad BCM (Body Control Module) which in that case you would most likely be having other weird problems.

The Thermostat and the sensor are both very easy to get to and replace. Take off the engine cover by removing the oil cap and they are both to the rear of the engine on the driver's side. They are right next to each other.

Hope this helps!

Posted on Oct 15, 2010

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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

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I have a 2004 Chrysler Sebring convertible. For about a week or two it has been hard to start. Cranking but not turning over. Today, my check engine light came on and the car began to idle really low. ...


code p 0128 refers to coolant thermostat--coolant temp below thermostat regulating temperature ===causes --mechanical fault
replace the thermostat
your problem may be low fuel pressure from a faulty pressure regulator
have the fault codes read professionally as the code you have is not related to your problem

Jun 04, 2017 | 2004 Chrysler Sebring Convertible

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Service engine soon light


code P0128 :say that the engine is not running normal temp.but less.how the pcm can say that . it's receiving info from coolant sensor. 2things one the coolant sensor is telling the right temp. or the thermostat don't. Change thermostat and see if it change the condition.

Sep 11, 2013 | 2003 Buick LeSabre

1 Answer

Check engine light came on and the code was 0128 ect sensor below themostat regulating temperature. how do i fix it?


A code P0128 may mean that one or more of the following has happened:

Low engine coolant level.
Leaking or stuck open thermostat.
Faulty cooling fan (running too much).
Faulty coolant temperature (ECT) sensor.
Faulty intake air temperature (IAT) sensor.

90% of the time it is the thermostat. I just replaced the thermo on my 2004 TB, it was giving the same code. You can still drive it with the problem and the ses light may come and go, but the problem will not go away--in the meantime, your mpg will drop significantly because the PCM will try to compensate for the low coolant temp. I gained 2-3 mpg easily after I replaced mine. It's a good idea to also replace the ECT at the same time, both the ECT and thermo require removal of the alternator to replace them and the ECT is right above the thermo.

Sep 24, 2011 | 2004 Chevrolet TrailBlazer

2 Answers

Low coolent temp. Check engine light on


get the code but i bet its the temp control sensor.

Jan 21, 2011 | 2004 Buick Rainier

1 Answer

I have a 2004 Gmc Envoy putting out a code of 0128 what does this mean?


It means the car has not reached operating temp. The computer wants the engine a certain temp so it can go into "closed loop" where it fine tunes the fuel mix for optimum economy and emissions. If it cannot reach that temp it sets that code. You either have a low coolant level or a stuck open/missing thermostat.

Jan 10, 2010 | 2002 GMC Envoy XL

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

1 Answer

Engine code;0128,for 2000 Daewoo,Nubira


I checked generic code #128-- coolant thermostat (coolant temperature below thermostat regulating temperature) hope this helps. Check for code after car totally warned up. If it isn't running at operating temp. thermostat may be stuck open.

Nov 15, 2008 | 2000 Daewoo Nubira

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