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.

 

[LibertyTC]

I'd also like to mention that short trips can make the KJ unhappy as the stock pcv valve, can become plugged up with a yellowish foam.
Best thing is to drive the jeep a bit further !
This is what my pcv valve looked like due to short trips in cooler weather. Are you using a full synthetic 5w-30 oil?

 

[joycer]

will check that