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  1. P0128 - Need new thermostat, but does it matter?

    OEM Issues
    Lately my '06 I6 (95K miles) has been regularly throwing a P0128, and it does seem to be running a bit cooler than normal, so I need a new thermostat. I know these forums are full of great how-tos, but I'll probably just pay a pro eventually. My question is, do I really care about this right...
  2. 08 Envoy; Can't locate ECT Sensor

    OEM Issues
    Hi All, I am new to the forum and I am making my very first post! I have a 2008 GMC Envoy with the 4.2L I6 engine. I recently began noticing my temperature gauge intemittently not working. Some days it would display the correct temperature and then some days nothing. Then last week I got a check...
  3. 2007 Trailblazer Thermostat/radcap/belt

    OEM Issues
    Im going to replace the thermostat (code p0128) and I had a few questions about the parts. The stant thermostat #14659 says 187º on the website and Amazon says 190º. Are these operating temperatures or the temp at which it opens up? I know the truck's correct operating temp is 210º. Would you...
  4. 2006 Envoy - P0128 / mileage question

    Just purchased a 2006 Envoy 4.2 - 119K. Threw a P0128 code and had it reset and I've found lots of information (t-stat) on the code. I've got a couple of questions: 1 - What is the optimal temperature that I should look for? Right now it's showing a hash-mark or 2 short of 210 degrees F. Is...
  5. P1221, P0128 Reduced Engine Speed

    I've been getting a service engine light along with a reduced engine power that will not alow the truck to accelerate. After a restart the service engine light will stay on but reduced engine power is not triggered and will allow me to continue to drive until triggered again. I went to autozone...
  6. Greetings I'm the new girl and my 2004 TB...

    Hi. My name is MBird and I'm a girl in Michigan who owns a 2004 Trailblazer with an inline 6 contrary to my description above my car ooops ! how do i correct that?
  7. P0128 disrespected my MPG

    OEM Issues
    Coming home from Carlisle my temp gauge was much lower then normal. It happened 2 more times throughout last week. No SES. Got bored and went looking for one trip faults. The freeze frame was similar to this, long run time barely 180. Not a bad job. Didn't mess with extensions through...
  8. My only car, my TB is letting me down.

    OEM Issues
    About a month ago, my TB had a dead battery, so I got it recharged. It then happened 2 more times. Finally, I bought a new battery. Don't know if it relates but, after that, I started getting the dreaded Reduced Engine Power Light along with the SES. Took it to Autozone and got code p1271 along...