HOW TO FIX CODE PO128
Code 128 is for the engine not warming up to normal temp.
Usual problem is a faulty thermostat.
SOURCE: what do I need to do to fix my 2005 trailblazer.
Change the coolant temperature sensor. If the code is still there, change the thermostat, it might be stuck open causing the engine to run cooler than it should.
Testimonial: "ty so much, could I ask where is the sensor ? Im sorry to be a bother..."
SOURCE: 2005 equinox with P0405 code.
Do you have an odd smell in the interior compartment? This could be due to the egr being damaged from debris from the road. Hire a professional to do it or go to a car parts store and get the motors repair manual or similar.
SOURCE: My 2005 chevy equinox is displaying the P0405
Erase the code and see if it returns. If it does, replace the valve. What engine do you have? If it is a 3.4 it should be right on top. One plug and two bolts.
SOURCE: what could cause code PO128 to come up on a 2002
Sounds like the thermostat may be stuck open or
has anyone put a colder thermostat in the car,because once it starts to
get cold it will throw a SES with a colder then stock thermostat.
Code PO128; coolant temp below thermostat regulating temp. Replace the thermostat and that should address your issue.
Thank you for using fixya and good uck
SOURCE: sensor keep coming in for
DTC P0128: Engine Coolant Temperature (ECT) Below Thermostat Regulating Temperature
Do you have any issues with heat in the vehicle? If so the thermostat may need replaced If not the engine coolant temperature sensor is most likely reading incorrectly due to a bad sensor or connection to the sensor.
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