I have a 2008 Jeep wrangler unlimited Sahara. with around 136000KM (canada) No Warranty.Recently I had the etc light and check engine light come on with the over heat light screaming. I did the key/ignition dance and received code P2181. I replaced the thermostat and the ECT sensor and it seemed to fix it. Then a few weeks after the ETC light came back on with the check engine. But this time the temp gauge drops to 0. I replaced the ect sensor again, and thermostat.
When idling it will indicate a temperature but wont make it to half. Once I start driving i lose most of my heat out of the defrost, and the gauge will go down to zero and the etc light comes on with the check engine.
Every time the ect comes on the fan goes on Hi. I check rad hoses, they are a good temp, and Im not boiling over.
If I shut off the engine and restart it the ect goes out and the check engine stays on, fan also stays off.
I get a bit of heat back but the gauge will slowly go back to 0 and eventually the ect will come back on after it reaches 0.
The water pump seems to be working. I have watched the fluid circulate with the rad cap off and running.
Also, when i leave the jeep over night or a few hours in the parking lot at work and start it, the check engine and ect light dont come on and it seems to warm up properly. Then after driving for about 15mins it all starts again.
I have just recently borrowed a code reader and it is flashing P2181 again. I have cleared it and when the lights come back on again I get the same code.
Im wondering if maybe its a wiring issue? Ground, terminal connector, or even the entire ect wiring?
Any suggestions would be amazing!!!