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P0128 code

Tiny
AARONMAN
  • MEMBER
  • 2006 CHEVROLET MALIBU
  • 2.2L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
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.
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Thursday, March 28th, 2019 AT 1:41 PM

5 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good evening,

What temperature thermostat and what brand did you use?

Roy
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Thursday, March 28th, 2019 AT 3:15 PM
Tiny
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?
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Thursday, March 28th, 2019 AT 3:22 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 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
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Thursday, March 28th, 2019 AT 3:25 PM
Tiny
AARONMAN
  • MEMBER
  • 3 POSTS
Thanks what brand do you recommend? Any OEM brand?
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Thursday, March 28th, 2019 AT 3:28 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Stant is a good brand.

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

Roy
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+1
Thursday, March 28th, 2019 AT 3:31 PM

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