P0128 Jeep grand Cherokee

Question

code p0128 on a 2011 Jeep Grand Cherokee

Do I have to replace the thermostat?

Answer 1

Hi there,

With this code it is possible the thermostat is the issue or the coolant temp sensor. Basically the computer thinks the coolant should be hotter then it's getting. This is a sign in most cases that the thermostat is sticking in the open position.