Engine light 2004 Liberty

[joycer]

I have a 04 Liberty 3.7 6cyl. with 75,600 miles. Got an engine light a couple of months ago---P-0128. I have since replaced the engine coolant temp sensor, radiator cap, and ECM [which had to be cloned]. A/C and Heat work fine and temp gauge is fine. Vehicle is primarily used for short [less than 10 miles each way] trips. Any thoughts or possible fixes? Thanks.

 

[LibertyTC]

This code means that the engine did not warm up to 180 degrees in 10 minutes after startup.
Could be the thermostat is stuck open? Try a new Mopar thermostat?
Only use Mopar Hoat Coolant or Zerex GO5.