Code P0128
#1
Code P0128
So while driving down the freeway in my 2008 HHR LT with the 2.4L engine yesterday the check engine light came on and the temp gauge quit working. When I got home I scanned for a code and got the P0128 (Thermostat) code. Funny thing is I replaced the thermostat just a few months ago when the car hit 90K miles with one of those expensive ones that if it fails, it will fail open instead of closed. So now I have to decide whether I should replace the Engine Coolant Sensor this time or the thermostat all over again. This is like Russian Roulette!
#2
Here's something to read:
https://www.obd-codes.com/p0128
https://www.obd-codes.com/p0128
#4
#6
I replaced my thermostat yesterday for the same reason. OBD P0128.......cleared the code and everything works correctly.
I paid close to $70 for mine thru a local Chevy dealership. Could have waited and got a lower (half the) price online, but I need the HVAC defrost feature to operate at peak efficiency as the weather where I live is currently wet, cold and rainy.
I paid close to $70 for mine thru a local Chevy dealership. Could have waited and got a lower (half the) price online, but I need the HVAC defrost feature to operate at peak efficiency as the weather where I live is currently wet, cold and rainy.
#8
After clearing the code I drove it yesterday and I noticed the coolant temperature came up quickly and the check engine light did not activate. Maybe it was just a fluke before, I will closely monitor it and I it does it again I'll pick up the ACDelco thermostat. Thanks for your advise!