LBZ: P0128 code

[aggar]

I keep getting this code. First started back in the fall(october). would do it once in a while. Clear the code and good for about 2-3 weeks. Then it would come back. Now I clear it, and it comes back the next time I start the truck. Any ideas? Thermostat?

 

[ruffmanatv]

Sure you already know this,

Code: P0128
Modules: ECM, PCM
Description: Engine Coolant Temperature (ECT) Below Thermostat Regulating Temperature

Not quite sure what could be causing it. I would say thermostat, though.

 

[aggar]

That's what I'm thinkin as well. Going to the dealer on Monday for some other things and I'm gonna have them look at that as well.