SOLVED: 2012 Jeep Liberty. The Coolant Sensor. - 2012 Jeep Liberty Sport 4dr... (2024)

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2012 Jeep Liberty Code P0128

It was the right fix. Did you use a scan tool and reset the code after installation of the new parts? Sometimes you need to do it a couple of times.

Error code P0128 indicates that your engine coolant temperature is below the thermostat regulating temperature. This means that your Engine Control Module (ECM) or Powertrain Control Module (PCM) has recognized that your engine is running cooler than it's supposed to.Kelley Blue Book
https://www.kbb.com > obd-ii > p0128P0128 - Coolant Thermostat (Coolant Temperature Below .....

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Apr 24, 2024 •

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2012 jeep liberty Poor Gas Mileage. 3.7 15,000 original miles.Installed new plugs, getting only 10-12 miles per gallon. Any Suggestions?

You may have an oxygen sensor problem - check for error codes with a code scanner.

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May 24, 2021 •

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Engine light on 2012 hyundai genesis sedan

I did a quick Google search and found P0128 may indicate a stuck thermostat. The engine is not warming up properly. There are other 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
I got most this info from another thread on Fixya. I hope that it helps you.

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Mar 29, 2014 •2012 Hyundai Genesis 3.8 Sedan 3.8L V6...

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CODES P0300, P1128

po300 is random miss fire doubtful two O2 sensors bad at one time most likely coolant temp sensor is bad causing engine to run rich this will cause O2 sensors to throw a code(thats what they are there for..exhaust gas temp. and raw fuel) running rich will also fowl spark plugs(=miss fire) P1128 ??

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Mar 20, 2013 •2006 Jeep Liberty

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Eror code: PO128 Code

This means that the engine's PCM detected that the engine has not reached therequired temperature level within a specified amount of time after startingthe 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, ittakes into account the length of time the vehicle has been running, the intakeair temperature (IAT) sensor reading, the engine coolant temperature (ECT) sensorreading, and the speed of the vehicle.
SymptomsYou will likely not notice any drivability problems other than the MILillumination.
CausesA 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 SolutionsPast experience indicates that the most likely solution is to replace the thermostat.However here are some suggestions on troubleshooting and repairing a P0128 OBD-IIcode:

  • Verify coolant strength & level
  • Verify proper cooling fan operation (check if it's running more than itshould). Replace if necessary.
  • Verify proper engine coolant temperature (ECT) sensor operation, replaceif necessary.
  • Verify proper intake air temperature (IAT) sensor operation, replace ifnecessary.
  • 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

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Feb 08, 2011 •

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Error code po128

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 this answer).

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Jan 07, 2011 •2002 Chevrolet Venture Passanger

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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).

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Sep 27, 2010 •2006 Dodge Caravan

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Dtcdescriptionp0128andrepair

DTC P0128 - 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.

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 a TSB such as this one. The ECM may need to be reprogrammed to correct the P0128 code

Hope helps (remember rated this).

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Jul 01, 2010 •2004 GMC Envoy

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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.

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Jan 06, 2010 •2004 Kia Spectra

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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

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Sep 08, 2009 •2006 Chevrolet Malibu

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SOLVED: 2012 Jeep Liberty. The Coolant Sensor. - 2012 Jeep Liberty Sport 4dr... (2024)

FAQs

What happens when your coolant sensor goes bad? ›

While sometimes a faulty sensor sends a permanent cold signal to the engine, it can also send a permanent hot signal. The computer will again miscalculate the signal and cause the engine to heat up instead of cooling it down. When this happens, the car might misfire, or it could lead to engine knocking.

What does code P2181 mean on a 2012 Jeep Liberty? ›

The most obvious cause of a P2181 code is that your engine is not running at the proper temperature; this may happen because your engine coolant level is too low, your thermostat is stuck in the open or closed position, or part of your coolant system isn't working as intended.

Where is the coolant sensor located? ›

The coolant temperature sensor will be located directly behind the coolant pipe. In most modern cars and vehicles, this is present behind the right cylinder head that is located right underneath the air intake pipe.

Is it easy to fix a coolant sensor? ›

Replacing a coolant temperature sensor is a fairly manageable task for a DIY mechanic.

Can you drive with a bad coolant sensor? ›

Driving with a bad coolant temperature sensor is not recommended, as it can lead to various problems and potential engine damage. The coolant temperature sensor plays a crucial role in monitoring the temperature of your engine's coolant and providing this information to the engine control unit (ECU).

How to reset coolant temperature sensor? ›

Coolant temperature sensors are resistors and can't be reset. The engine control unit is the part that actually runs software and just takes information from the sensor. If you think you have a problem with your sensor, test its resistance by attaching it to a multimeter and submerging the sensor in hot water.

How much does it cost to fix a coolant sensor? ›

If your ECT sensor needs to be replaced, it will typically cost between $200 and $400. This includes the cost of labor, which is usually between $100 and $150, and the cost of parts, which is usually between $5 and $250.

What are the symptoms of a bad coolant level sensor? ›

Coolant level sensors report low radiator coolant. Symptoms of a bad coolant level sensor include an illuminated check engine light, an untriggered coolant level sensor, and an overheating engine.

Can you replace a coolant sensor yourself? ›

Using a wrench, unscrew the coolant temperature sensor from the coolant passage. A ratcheting wrench can be a big time saver in tight spaces. Insert the new sensor. Torque to spec listed in your repair manual, usually under 20 lb-ft.

What happens if you disconnect coolant sensor? ›

If you unplug the sensor when the engine is cold the engine may run smoothly at first but as the engine warms up the a/f mix will become too rich and the engine will start misfiring and possibly stall.

Will a coolant sensor throw a code? ›

But a faulty engine coolant temperature (ECT) sensor can cause havoc on an engine or its related systems. These are the most common problems: 1. Your check engine light is on: If the engine's computer detects a problem with the coolant temperature sensor, or its circuit, it will turn on the check engine light.

Can you drive with a bad coolant control valve? ›

As long as the engine isn't overheating, it's safe to drive until it's repaired. This shouldn't be a huge factor on the engine cooling system. If you see the temp light come on, then stop driving the car, otherwise, it's safe to drive.

What happens if coolant temperature sensor is disconnected? ›

If you unplug the sensor when the engine is cold the engine may run smoothly at first but as the engine warms up the a/f mix will become too rich and the engine will start misfiring and possibly stall.

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