What is the most likely cause for engine code P0128 on a 2012 wrangler

Question

What is the most likely cause for engine code P0128 on a 2012 Jeep Wrangler?

Answer 1

P0128 Thermostat rationality

The likely cause is the thermostat, that or you have low coolant level, You can even set this code if you use just plain water.