Question about 2001 GMC Savana

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Code p.0128 coolant temp below thermostat regulating temperature is on om2 65 c. or149 F why is this code on

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6ya6ya
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Posted on Jan 02, 2017

emissionwiz
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SOURCE: '08 silverado. dash board diplays, engine running

P0128 OBD-II Trouble Code Technical Description

Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
What does that mean?

This means that the engine's PCM detected that the engine has not reached the required temperature level within a specified amount of time after starting the engine. The intent of the P0128 code is to indicate a faulty thermostat. Similar codes: P0125

In determining the engine did not reach a "normal" temperature, it takes into account the length of time the vehicle has been running, the intake air temperature (IAT) sensor reading, the engine coolant temperature (ECT) sensor reading, and the speed of the vehicle.
FB.init("dd7d9e9681341cde77587bc6a2029f6f"); OBD-Codes.com on Facebook Symptoms

You will likely not notice any drivability problems other than the MIL illumination.


Causes

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

Possible Solutions

Past experience indicates that the most likely solution is to replace the thermostat. However here are some suggestions on troubleshooting and repairing a P0128 OBD-II code:

  • Verify coolant strength & level
  • Verify proper cooling fan operation (check if it's running more than it should). Replace if necessary.
  • Verify proper engine coolant temperature (ECT) sensor operation, replace if necessary.
  • Verify proper intake air temperature (IAT) sensor operation, replace if necessary.
  • If the above items check out good, replace the thermostat


Posted on Oct 26, 2010

  • 7353 Answers

SOURCE: 2005 GMC Envoy 4.2 L

Yes, Have a repair shop replace it, it comes with a new housing.

Posted on Feb 01, 2011

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SOURCE: I have a 2005 gmc

SOUND LIKE THERMOSTAT STUCK OPEN OR THE COOLANT LEVEL TOO LOW OR COOLANT MIXTURE NOT CORRECT.OR ENGINE COOLANT TEMPERATURE SENSOR FAULTY OR PCM FAILED.

Posted on Apr 18, 2011

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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

1 Answer

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

1 Answer

2005 Colorado Z 71 LS 4X4 shows codes B0899, U1026, U 1064, P 0128, P 0442. What needs fixing?


U1026 SCP (J1850) Invalid or Missing Data for Engine RPM
U1064 SCP (J1850) Invalid or Missing Data for Primary Id
P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
P0442 Evaporative Emission Control System Leak Detected (small leak)
Hope this can help you!
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Dec 05, 2012 | 2006 Chevrolet Colorado

1 Answer

What's your problem?error code 0128


DTC P0128 - Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
This means that the engine's PCM detected that the engine has not reached the required temperature level within a specified amount of time after starting the engine. The intent of the P0128 code is to indicate a faulty thermostat. Similar codes: P0125

In determining the engine did not reach a "normal" temperature, it takes into account the length of time the vehicle has been running, the intake air temperature (IAT) sensor reading, the engine coolant temperature (ECT) sensor reading, and the speed of the vehicle. If have other request, just contact us about OBD Diagnostic Truble Codes.

Hope this helps.

Oct 03, 2011 | 2003 Chevrolet TrailBlazer

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 have a 2005 GMC ENVOY with a sensor reading of 0128 and they said it was my sensor bad. But now i am loosing power going up hill. Does this mean i have another problem? If so what could it be?


PO-128 Coolant Thermostat, Temp Below Regulating Temperature

Leaking or stuck open thermostat
Coolant temp sensor
Cylinder head temp sensor
Engine coolant level

You could have more than one issue

The only way to answer your questions,is to put a scanner on your vehicle,and see what codes you have.
The codes you get,do not indicate a failure,necessarily
You have to follow a diagnostic process,to find any problems.
If you have been going to auto parts stores,to have codes read,and have no knowledge or intension of doing your own work,you need to find a good repair shop, and just have it repaired,fairly soon

May 25, 2010 | 2005 GMC Envoy

1 Answer

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

Dec 22, 2009 | 2002 Chevrolet Blazer

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

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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