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P0128 AND JUST INSALL NEW THERMOSTAT AND NEW COOLANT TEMP. SENSOR

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YOU NEED TO ERASE CODE WITH A CODE SCANNER.ANY TIME YOU REPLACE NEW SENSOR YOU HAVE TO REMOVE CODE WITH A CODE SCANNER IF NOT IT WILL KEEP COMING ON.

Posted on Oct 13, 2010

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P0128 came back after replacing t-stat


code p 128 refers to coolant thermostat---coolant temp below thermostat regulating temperature ====causes --mechanical fault
you say that you have replaced the thermostat and it is just under 210 F which is 99 c or almost boiling point
you will have to investigate why it is running so hot.
check that you put the thermostat in correctly ( bulb section to block/head water
Next point --the codes are originated by the coolant temperature sensor ( puts the fans on and sets the ECM fuel/air ratio for the engine ) so to get it off you will need to reset with a scan tool

Dec 24, 2015 | 2005 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

HAVE CODE P0128 AND P0522 CHANGED TEMP SENSOR HELP PLEASE


P0128 indicates coolant temp lower than expected and P0522 indicates low input from the oil pressure circuit. The first one sounds like a thermostat possibly stuck open. Check coolant temperature. It should reach approx 195 degrees. The second one could be a bad OP sender, low oil pressure or some other problem on that circuit.

May 10, 2011 | Dodge Neon Cars & Trucks

2 Answers

2003 chevy cavalier with no heat and temperature doesn't rise past 40 degrees engine code P0128 comes up when checked and the thermostat and radiator have been replaced still isn't fixed what do i do?


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
Possible Solutions

Feb 27, 2011 | 2003 Chevrolet Cavalier

2 Answers

Eror code: PO128 Code


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.
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:
  • 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
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
  • If Nissan vehicle, check for Technical Service Bulletins (TSBs), as the ECM may need to be reprogrammed to correct the P0128 code
Other ECT sensor and circuit related DTCs: P0115, P0116, P0117, P0118, P0119, P0125

Feb 08, 2011 | Buick Rendezvous Cars & Trucks

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

2 Answers

P0128 coolant temp below thermostat/regulating temp


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.

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:
* 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

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
* If Nissan vehicle, check for Technical Service Bulletins (TSBs), as the ECM may need to be reprogrammed to correct the P0128 code

Hope helps (remember to rate and comment this).

Sep 27, 2010 | 2006 Dodge Caravan

1 Answer

P0128 thermostat range performance is the diagnosis when diagonstic check is done. The check eng. light goes off when battery is disconnected but comes on again after a few days. Pls. advise solution....


P0128 indicates that the car doesn't "think" it is warming up quickly enough. So either it really isn't getting warm enough, or the sensor indicating the temperature is bad. If it isn't getting warm enough the causes include a thermostat stuck open, low coolant, and a cooling fan that is running when it shouldn't be.

For a good explanation and more insight visit
http://www.obd-codes.com/p0128

Keep in mind that many cars have two coolant temp sensors. One for the computer, and one for the temp gauge. Make sure you are working with the correct one.

Feb 08, 2010 | 2002 Honda Accord

3 Answers

What can keep causing Check engine code P0128


CODE P0128- THERMOSTAT MALFUNCTION. POSSIBLE CAUSES 1. ECT SENSOR IS OUT OF CALIBRATION. 2. CHECK THE OPERATION OF THE THERMOSTAT IT MAY BE STUCK OPEN.3.INSPECT FOR LOW COOLANT LEVEL OR FOR AN INCORRECT COOLANT MIXTURE.

Jan 06, 2010 | 2004 Kia Spectra

1 Answer

2007 Chevy Cobalt with p0128 and "---" temp reading


The P0218 Code is primarily intended to indicate a faulty thermostat.
Have the thermostat replaced

Other possible causes that could trigger this code would be:
Low engine coolant level
faulty cooling fan
faulty coolant temperature sensor
faulty intake air temperature sensor


Sep 08, 2009 | 2006 Chevrolet Malibu

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