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2004 Pontia grand am code p0128 - Cars & Trucks

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Make sure you don't have any leaks in the cooling system and that coolant level is where it should be in the radiator and reservoir. This code is commonly caused by the thermostat sticking open. Replacing the thermostat usually takes care of this problem. Make sure your coolant temperature sensor is in working order. Good luck!

Posted on Dec 09, 2012

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2004 Envoy Code P0128


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 thermostate if its not overheating get it to a mechanic its probly stuck open

Dec 11, 2013 | 2004 GMC Envoy SLT

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Code p0128


Coolant Thermostat

Oct 23, 2013 | 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.

Feb 06, 2013 | 2004 Chevrolet TrailBlazer

1 Answer

PO128


P0128 is an insufficient coolant temp code. Which means the coolant temp is not coming up to full operating temperature fast enough or not at all. The fix for this is to replace the thermostat.

Aug 07, 2012 | 2004 Pontiac Grand Prix

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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

2006 pont grand prix when car gets warm it starts misfiring i will scan it code po300 comes up and code po 128


P0300 is a code for multiple misfire. Which could be created to the P0128
P0128 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.
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
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
Good luck and hope this helps. keep me posted, be glad to know your car is running 100% again soon.

Nov 04, 2009 | 2006 Pontiac Grand Prix

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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