Google says the code is from engine being to cold to long. May pull thermostat. I believe it stamped on them when they open. Make sure it's right temp. Be a good place to start

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Go get another thermostat... stant or mopar 195...
NOT a failsafe...
You either have the wrong one or it is defective.

 

been there, done that! ^^^^^ this is the only way to fix it.

 

I did same thing on 05 tj Rubicon U. 4.0. I thought the engine was running to high temp. I decided that based on not being able to touch anything under the hood from the heat. Read a blog later about better gas mileage. I didn't verify but it said 210 is operating temp anything lower can cause computer to make fuel adjustments to bring up temp. I remembered that before it did stay on 210 all the time. I took the 185 out and put the 210 back in. Could be related. But I'm a newbie here reader beware. Peace

 

So after installing a new Mopar thermostat I’ve got the same issue.

Any thoughts guys??

 

It’s got a brand new mopar thermostat. Still won’t go over 160 degrees.

 

Did you get it fixed? One other thought...If you are even a little low on coolant the temp sensor wont read correctly since it is located in one of the highest points in the system, meaning it wont be submerged in coolant so it cant read the temperature. And if the system is low enough--about 1/2 full it wont circulate coolant through the heater core.

 

Get an ir heat gun and verify that actual temp mirrors gauge temp

 

There's not too many reasons for an engine to not get up in temperature. Uncontrolled system or faulty reading

Did you
Use 50/50 coolant/water?
Purge system and top off?

Can you?
Grab and hold onto heater lines and touch radiator when hot?

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You said heat is luke warm? At heater? Possible there's air in system or its clogged with leak stop. Both could screw up temperature at sensor if air or gummy crud is covering it

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I've seen water pumps stop working. From coming apart or obstruction. That will cause a coolant system issue. Low coolant level or air pocket like the last guy said can cause heater issues.

 

I'm having the same problem on my 03 and just ordered a new 195 Stant thermostat. I just noticed the problem when it gets below freezing outside and then it will throw that code. The first time it was low on coolant because of a loose lower hose but this time not so sure.

Last winter I didn't get the code but had to keep heat on high but wouldn't keep me warm on defrost. My last tj would cook you so I knew something was wrong. I flushed the heater core and it seems better now but not sure if it's 100% yet.

 

I'm getting it on my '05 2.4L whenever I jump in and drive off without letting it warm up a bit when the temps get around freezing. 2nd t-stat, heats fine, no leaks, etc. I'm getting used to using my Torque App to clear it.

Maybe a 'slow' temp sensor at the gooseneck, may be dirty connections at said sensor, but where you say the heat is weak that would lean more toward 'low' water flow. Low due to air, restriction, down on fluid, that sort of thing.