Question about 2005 Jeep Grand Cherokee

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Engine code P0128

What do i need to do to fix this problem

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  • jeepster43 Dec 24, 2008

    how did you determine that you had code P0128 ? did you take it to a shop, or did you get this yourself from a specific procedure to view engine codes. I am trying to figure out how to read check engine codes on my 2005 grand cherokee

  • codesam Mar 08, 2009

    I have an 05 grand cherokee with the same code. Coolant level good. Changed the thermostat because it is the cheapest swap. still ran cool on guage. Changed coolant temperature sensor, engine at proper temp on guage ( it is located on the front top center of engine in front of the plastic runners for the intake). No more P1028 code. Drivability problems now. Changed spark plugs approx. 54000 miles. The old plugs were badly burned down to 65 thousandths. New at plugs at 44 thousandths. More power but still have drivabilty issues. Still trying to find out why? I think 1 or more of the 4 oxygen sensors are bad? Maybe converter damaged? Hope this helps Derek

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  • 231 Answers

Check your temperature sending unit and be sure it is working properly and then check to see that your thermostat is working properly if you are getting heat inside of the vehicle from the heater then this would be a good indication that your thermostat is working properly. also check your coolant level is correct.
code P0128 is coolant thermostat ( coolant temp below thermostat regulating temperature )

Posted on Oct 14, 2008

5 Suggested Answers

Villager96
  • 99 Answers

SOURCE: how do i fix the check engine light code p0128 on

May be a faulty thermostat or the thermostat sensor. Change the thermostat first it's a lot cheaper, unplug the neg battery terminal for 10 minutes to allow the code to erase and check it again. Good luck

Posted on Mar 02, 2010

  • 77 Answers

SOURCE: Error Code P0128 service engine light comes on intermediately

replace the thermostat.

Posted on Apr 30, 2009

mrgreenz
  • 962 Answers

SOURCE: What can keep causing Check engine code P0128

P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature.)
Meaning the regulating temperature is higher than the themostat cooling temperature . you may have to replace the Coolant sensor again. or maybe both. Sorry !

Posted on Jan 06, 2010

ZX2Fast
  • 547 Answers

SOURCE: check engine light on got

P0128 ECT Sensor Below Thermostat Regulating Temperature

P0420 Catalyst System Bank 1 Low Efficiency

P0455 EVAP System Large Leak (0.080") Detected

For the 'P0128' your engine isn't getting up to operating temerature. This could be because of a low coolant level or your thermostat is stuck open. For 'P0420', this indicates your catalyst isn't working as well as it should. If you have a four cylinder, this will be the first cat in the system, if you have a V6, then it will be the one on the driver side. Since this code can also indicate a clogged catalyst, you should get this checked at an exhaust shop. They can do a back pressure test to see if it is clogged. For the 'P0455', this indicates you have a fuel leak from the pressure system in the fuel tank. The EVAP takes fuel from the tank that builds up pressure and stores it in a canister until you start the engine. Then it shunts this fuel into the engine to be burned.

Posted on Jan 06, 2011

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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2 Answers

My PT Cruiser has the following diag report codes. p0480 p063a p0344 p0128. What does this all mean and what do I need to do to fix it?


p0128- coolant thermostat
p063a-
p0344-camshaft position sensor A bank 1 -circuit intermittent
p0480- engine coolant blower motor 1- circuit malfunction

Sep 12, 2016 | Chrysler PT Cruiser Cars & Trucks

1 Answer

What does error code p0128 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

Read more at: http://www.obd-codes.com/p0128
Copyright © OBD-Codes.com

Feb 04, 2015 | Cars & Trucks

1 Answer

2004 trailblazer code po128


P0128:
P0128 OBD-II Trouble Code
Technical DescriptionCoolant 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.

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 .Here's a link on replacing your thermostat.

Feb 06, 2013 | 2004 Chevrolet TrailBlazer

1 Answer

P0128 engine code fix 2006 colorado


The code means the cooling system is not reaching normal operating temp.
The common cause is a faulty thermostat which you would replace.
It could be something else such as a faulty temp sensor.

Oct 02, 2012 | 2006 Chevrolet Colorado

1 Answer

Whats code ecu 128


We are assuming that you are talking about P0128 code.

P0128 OBD-II - 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.

Contact us if need additional details.

Oct 12, 2011 | Cars & Trucks

1 Answer

SES light coming on. P0128 code from auto parts place. what do i do to fix this myself?


Hi, you have a faulty thermostat, so you should just need a thermostat, associated gasket (or gasket maker), and some fresh antifreeze. Consult a vehicle-specific manual for specifics on your particular engine.

More P0128 info @ http://www.obd-codes.com/p0128

Feb 09, 2010 | 2004 Pontiac Grand Am

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

P0128 Code for a 2004 trailblazer with service engine soon light


Replacing it is the only fix. Sounds like it may be sticking open slightly.

May 27, 2009 | 2004 Chevrolet TrailBlazer

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