Question about 2001 Chevrolet Corvette

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Po128 code on 2001 corvette

While driving the check engine light came on and stayed on. Ran test and get po128 code, Coolant Thermostat(coolant temperature below thermostat temperture). Any suggestions as to what this means or what I need to do for it?

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Replace the thermostat. computer sees engine is running too cool thermostat stuck open.

Posted on Nov 11, 2008

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2004 buick rainer, po128 pending has heat the check engine light comes on and goes out temp is 195


PO 128 is a coolant temperature beyond threshold code. It means your thermostat is stuck and needs to be replaced.

Dec 29, 2014 | Buick Cars & Trucks

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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.

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Engine light came on while driving on highway for 30 minutes


po128 cooling system preformance, this can be caused by a bad thermostat or fan relay, if the fans are staying on to long and last a bad coolant temp sensor, this car uses two coolant temp sensors, the best way would be with a scan tool to watch the sensor values and see if there are ok, this being a 2009 honda with 32,000 miles , this type of problem is not seen to often. check connections to sensors and make sure wiring is ok,

Jan 16, 2013 | Honda Accord Cars & Trucks

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Po128 how to cure the problem code


Trouble Code: P0128

Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

Possible Causes:


Insufficient warm-up time.Low engine coolant level.Leaking or stuck open thermostat.Inoperative engine coolant temperature sensor.Inoperative cylinder head temperature sensor.Here are the reasons.

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2001toyota camry 4cyL PO128 code coolant below thermostat found coolant level is full


it is most likely that you need to just replace the thermostat and gasket cause engine temp is not getting hot enough

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My 2003 chevrolet giving a code p0128


CODE PO128 - ECT SENSOR BELOW THERMOSTAT REGULATING TEMPERATURE CONDITIONS. CHECK THE OPERATION OF THE THERMOSTAT IT MAY BE STUCK OPEN.ECT SENSOR HAS FAILED.CHECK FOR LOW COOLANT LEVEL OR INCORRECT COOLANT MIXTURE.- ECT SENSOR IS THE ENGINE COOLANT TEMPERATURE SENSOR.

Oct 21, 2010 | Chevrolet TrailBlazer Cars & Trucks

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I have a 05 chevy trailblazer, the check engine lite is on and a hand held analyzer indicated problem codes: PO410 $ PO128 any ideas? Wayne C


P0410

Definition
Secondary Air Injection System fault
Explanation
The air injection system is monitored for faults
Probable Causes
1) Circuit relay defective or fuse open
2) Check connector and wiring
3) AIR pump defective or hoses blocked


P0128
Fault Code Definition
  • Engine temperature has not increased and/or reached the correct level within a specified amount of time after engine startup
Common Problems That Trigger the P0128 Code
As for the po128 I would replace the thermostat first. That is the problem 99% of the time.

Good Luck

Jul 12, 2010 | Chevrolet Chevy Cars & Trucks

1 Answer

My check engine light is on and I can't pass inspection because of this problem. The code that appears is po128. What exactly does that mean?


The generic code stands for Coolant Thermostat (the Coolant Temperature is below the thermostat regulating temperature) Need to replace thermostat according to that it is opening too soon.

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