Getting the same code P0128?

Tiny
PHOENIX357
  • MEMBER
  • 2016 DODGE GRAND CARAVAN
  • 3.6L
  • V6
  • 2WD
  • AUTOMATIC
  • 162,000 MILES
I keep getting the same DTC Code on my van, code P0128. I have changed the thermostat as well as the engine coolant temperature sensor. Code was cleared after each repair. I also made sure the cooling system and heater core was bled after the repairs. I did a pressure test on the cooling system too and I didn't notice any drop in pressure, yet I have to add coolant every couple of weeks or so. I do not notice any white smoke from the exhaust upon starting or driving. The van has never overheated, and the heater produces hot heat in a reasonable amount of time. The entire engine bay always smells of coolant, yet I've never seen anything leaking. I know I must be missing something, but I can't figure it out and this is driving me crazy.
Tuesday, November 1st, 2022 AT 6:44 PM

2 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,645 POSTS
Hi,

Have you replaced the radiator cap? Also, have you checked to see if there is anything mixing in the engine oil?

Take a look through this link:

https://www.2carpros.com/articles/head-gasket-blown-test

When you replaced the thermostat, did you install the entire assembly? The code is specific to the engine not reaching operating temp within a specific amount of time.

Let me know.

Joe
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Wednesday, November 2nd, 2022 AT 2:03 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,256 POSTS
P0128 engine coolant is below temperature which can happen when the coolant is low. I would use a flashlight to inspect the radiator fins and core. This can leak and evaporate making it head to see. Check out this guide, it may help:

https://www.2carpros.com/articles/car-is-leaking-coolant

and

https://www.2carpros.com/articles/coolant-leak-symptoms

Please go over these guides and report back.

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Wednesday, November 2nd, 2022 AT 2:12 PM

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