P0128 code

2006 CHEVROLET MALIBU
100,000 MILES • 2.2L • 4 CYL • 2WD • AUTOMATIC
Avatar
AARONMAN
  • MEMBER
  • 3 POSTS
I have a P0128 code. I have changed out the thermostat and engine coolant temperature sensor. The engine still has trouble getting to operating temperature. The coolant level is filled and the fans are not stuck on. when the heater is on it blows medium warm air.
Mar 28, 2019 at 1:41 PM
Advertisement
Avatar
ASEMASTER6371
  • CERTIFIED EXPERT
  • 52,796 POSTS
Good evening,

What temperature thermostat and what brand did you use?

Roy
Mar 28, 2019 at 3:15 PM
Avatar
AARONMAN
  • MEMBER
  • 3 POSTS
I believe it was the fail safe brand from AutoZone. It is set to 180 degree. After you asked I read the reviews on AutoZone's website and it had 1 star with 5 reviews. Can a thermostat go bad after a few weeks?
Mar 28, 2019 at 3:22 PM
Advertisement
Avatar
ASEMASTER6371
  • CERTIFIED EXPERT
  • 52,796 POSTS
The fail-safe thermostats are junk.

You cannot use that type of thermostat. Besides, you need the OEM thermostat of 195 degrees. That is not an option and that's why the light is on.

Roy
Mar 28, 2019 at 3:25 PM
Avatar
AARONMAN
  • MEMBER
  • 3 POSTS
Thanks what brand do you recommend? Any OEM brand?
Mar 28, 2019 at 3:28 PM
Avatar
ASEMASTER6371
  • CERTIFIED EXPERT
  • 52,796 POSTS
Stant is a good brand.

Make sure you get the correct temperature and not a fail-safe unit.

Roy
Mar 28, 2019 at 3:31 PM